2012 Mercedes-benz CLS Class Owners Manual

The ETDs on the seats in the rear compartment are triggered independently of the lock status of the seat belts. The ETDs are triggered depending on the type and severity of an accident: Rif, in the event of a head-on or rear-end

collision, the vehicle decelerates or accelerates rapidly in a longitudinal direction during the initial stages of the impact

Rif, in the event of a side impact, on the side

opposite the impact the vehicle decelerates or accelerates rapidly in a lateral direction

Rif in certain situations where the vehicle

overturns and the system determines that it can provide additional protection

If the air bags are deployed, you will hear a bang, and a small amount of powder may also be released. Only in rare cases will the bang affect your hearing. The powder that is released generally does not constitute a health hazard. The 6 SRS warning lamp lights up.

Children in the vehicle

55

G WARNING Pyrotechnic Emergency Tensioning Devices that have been deployed must be renewed. For your safety, when disposing of Emergency Tensioning Devices, always observe the safety instructions. These are available from any authorized Mercedes-Benz Center. The PRE-SAFE® system has electrically operated reversible pre-tensioners that do not require replacement after activation.

! If the front-passenger seat is not

occupied, do not engage the seat belt tongue in the buckle on the front- passenger seat. Otherwise, the Emergency Tensioning Device could be triggered in the event of an accident.

Children in the vehicle Child restraint systems Important safety notes We recommend that all infants and children be properly secured in an infant or child restraint system at all times while the vehicle is in motion. The use of seat belts and infant and child restraint systems is required by law in all 50
states, the District of Columbia, the U.S. territories and all Canadian provinces. Infants and children must always be seated in an appropriate infant or child restraint system recommended for the size and weight of the child. The infant or child restraint system must be properly secured in accordance with the manufacturer's instructions. All infant or child restraint systems must meet U.S. Federal Motor Vehicle Safety Standards 213
and 225 and Canadian Motor Vehicle Safety Standards 213 and 210.2. An information label on the child restraint system indicates whether it meets these standards. This information is also provided in the installation instructions supplied with the child restraint system.

Always read and follow the manufacturer's instructions when using an infant or child restraint system or booster seat. Observe all warning signs in the vehicle interior and on the infant or child restraint. G WARNING According to accident statistics, children are safer when properly restrained in the rear seating positions than in the front seating position. Thus, we strongly recommend that children be placed in the rear seats whenever possible. Regardless of seating position, children 12 years old and under must be seated and properly secured in an appropriate infant restraint, toddler restraint, or booster seat recommended for the size and weight of the child. The infant or child restraint must be properly secured with the vehicle's seat belt, the seat belt and top tether strap, or lower anchors and top tether strap, fully in accordance with the child seat manufacturer's instructions. Occupants, especially children, should always sit as upright as possible, wear the seat belt properly and use an appropriately sized infant restraint, toddler restraint, or booster seat recommended for the size and weight of the child. Children can be killed or seriously injured by an inflating air bag. Note the following important information when circumstances require you to place a child in the front passenger seat: RYour vehicle is equipped with air bag

technology designed to deactivate the front passenger front air bag in your vehicle when the system senses the weight of a typical 12-month-old child or less along with the weight of a standard appropriate child restraint on the front passenger seat.

RFor children larger than the typical

12-month-old child, the front passenger front air bag may or may not be activated. Always make sure the 4 5 indicator

56

Children in the vehicle

lamp is illuminated, indicating that the front passenger front air bag is deactivated.

RA child in a rear-facing child restraint on the

front passenger seat will be seriously injured or even killed if the front passenger front air bag inflates in a collision which could occur under some circumstances, even with the air bag technology installed in your vehicle. The only means to completely eliminate this risk is to never place a child in a rear-facing child restraint in the front seat. We therefore strongly recommend that you always place a child in a rear-facing child restraint in a backseat.

RIf you must install a rear-facing child restraint on the front passenger seat because circumstances require you to do so, make sure the 4 5 indicator lamp is illuminated, indicating that the front passenger front air bag is deactivated. Should the 4 5 indicator lamp not illuminate or go out while the restraint is installed, please check installation. Periodically check the 4 5 indicator lamp while driving to make sure the 4
5 indicator lamp is illuminated. If the 4 5 indicator lamp goes out or remains out, do not transport a child on the front passenger seat until the system has been repaired. A child in a rear-facing child restraint on the front passenger seat will be seriously injured or even killed if the front passenger front air bag inflates.

RIf you have to place a child in a forward-

facing child restraint on the front passenger seat, move the seat as far back as possible, use the proper child restraint recommended for the age, size and weight of the child, and secure child restraint with the vehicle's seat belt according to the child seat manufacturer's instructions. G WARNING Infants and small children should never share a seat belt with another occupant. During an

accident, they could be crushed between the occupant and seat belt. A child's risk of serious or fatal injuries is significantly increased if the child restraints are not properly secured in the vehicle and/ or the child is not properly secured in the child restraint. Children too big for a toddler restraint must ride in seats using regular seat belts. Position the shoulder belt across the chest and shoulder, not face or neck. A booster seat may be necessary to achieve proper seat belt positioning for children over 41 lb (18 kg) until they reach a height where a lap/shoulder belt fits properly without a booster. When the child restraint is not in use, remove it from the vehicle or secure it with the seat belt to prevent the child restraint from becoming a projectile in the event of an accident.

If an infant or child is traveling in the vehicle: X Secure the infant or child with an

appropriate infant or child restraint recommended for the child's age and weight.

X Make sure that the infant or child is

properly secured at all times while the vehicle is in motion. G WARNING When leaving the vehicle, always remove the SmartKey from the ignition lock. Always take the SmartKey with you and lock the vehicle. Do not leave children unattended in the vehicle, even if they are secured in a child restraint system, or with access to an unlocked vehicle. A child's unsupervised access to a vehicle could result in an accident and/or serious personal injury. The children could: Rinjure themselves on parts of the vehicle Rbe seriously or fatally injured through

excessive exposure to extreme heat or cold Rinjure themselves or cause an accident with

vehicle equipment that can be operated

even if the SmartKey is removed from the ignition lock or removed from the vehicle, such as seat adjustment, steering wheel adjustment, or the memory function

If children open a door, they could injure other persons or get out of the vehicle and injure themselves or be injured by following traffic. Do not expose the child restraint system to direct sunlight. The child restraint system's metal parts, for example, could become very hot, and the child could be burned on these parts. G WARNING Do not carry heavy or hard objects in the passenger compartment or trunk unless they are firmly secured in place. Unsecured or improperly positioned cargo increases a child's risk of injury in the event of Rstrong braking maneuvers Rsudden changes of direction Ran accident

Special seat belt retractor All seat belts except the driver's seat belt are equipped with a special seat belt retractor. When activated, the special seat belt retractor ensures the seat belt will not slacken once the child restraint system has been secured. Installing a child restraint system: X Always comply with the manufacturer's

installation instructions.

X Pull the seat belt smoothly from the inertia

reel.

X Engage the seat belt tongue in the belt

buckle.

Children in the vehicle

57

Activating the special seat belt retractor: X Pull the seat belt out fully and let the inertia

reel retract it again. While the seat belt is retracting, you should hear a ratcheting sound. The special seat belt retractor is enabled.

X Push down on the child restraint system to

take up any slack.

Removing a child restraint system/ deactivating the special seat belt retractor: X Always comply with the manufacturer's

installation instructions.

X Press the seat belt release button and guide the belt tongue to the belt outlet. The special seat belt retractor is deactivated. G WARNING Never release the seat belt buckle while the vehicle is in motion, since the special seat belt retractor will be deactivated.

LATCH-type (ISOFIX) child seat anchors in the rear G WARNING Children that are too large for a child restraint must travel in seats using normal seat belts. Position shoulder belt across the chest and shoulder, not face or neck. In order to attain the correct seating position for children weighing over 41 lb (18 kg), it may be necessary to use a booster seat until they reach a height where a normal lap/shoulder seat belt lies properly across their bodies without the need for a booster seat. Install the child restraint system according to the manufacturer's instructions. The child restraint system must be installed firmly on both brackets. An incorrectly installed child restraint system can come loose in the event of an accident, causing the child to be severely or fatally injured.

58

Children in the vehicle

Child restraint systems/child restraint retaining brackets that are damaged or have suffered damage due to an impact must be replaced.

LATCH-type (ISOFIX) is a standardized securing system for specially designed child restraint systems on the rear seats. Securing rings for two LATCH-type (ISOFIX) child restraint systems are installed on the left and right of the rear seats. Secure non LATCH-type (ISOFIX) child restraint systems using the vehicle's seat belt system. Always install child restraint systems according to the manufacturer's instructions.

seat backrest could fold forward. The child restraint system is no longer supported properly or held in position and can no longer fulfill its function. This could cause serious or even fatal injuries.

Top Tether provides an additional connection between the child restraint system secured with ISOFIX and the rear seat. It helps reduce the risk of injury even further. The Top Tether anchorage points are located in the rear compartment behind the head restraints.

When installing the LATCH-type (ISOFIX) child restraint system, fold protective caps 2 of securing rings 1 inwards. X Install the LATCH-type (ISOFIX) child

restraint system. Comply with the manufacturer's instructions when doing so.

Top Tether G WARNING Always lock the rear seat backrests in their upright position when the rear seats are occupied by passengers. Lock the rear seat backrests in their upright position before installing the Top Tether straps or when the cargo compartment is not in use. Make sure that rear seat backrests are secured properly by pushing and pulling on the seat backrests. If the seat backrest is not locked properly, the

X Move head restraint : upwards. X Fold up cover ; of Top Tether anchorage

=.

X Route Top Tether belt A under head

restraint : between the two head restraint bars.

X Hook Top Tether hook ? into Top Tether

anchorage =.

X Make sure that Top Tether belt A is not

twisted.

X Fold down cover ; of Top Tether

anchorage =.

X Slide down head restraint : until it

engages (Y page 95). Make sure that you do not interfere with the correct routing of Top Tether belt A.

X Install the LATCH-type (ISOFIX) child

restraint system with Top Tether. Comply with the manufacturer's installation instructions when doing so. Make sure that Top Tether belt A is tight.

Child-proof locks Important safety notes G WARNING When leaving the vehicle, always remove the SmartKey from the ignition lock. Always take the SmartKey with you and lock the vehicle. Do not leave children unattended in the vehicle, even if they are secured in a child restraint system, or with access to an unlocked vehicle. A child's unsupervised access to a vehicle could result in an accident and/or serious personal injury. The children could: Rinjure themselves on parts of the vehicle Rbe seriously or fatally injured through

excessive exposure to extreme heat or cold Rinjure themselves or cause an accident with

vehicle equipment that can be operated even if the SmartKey is removed from the ignition lock or removed from the vehicle, such as seat adjustment, steering wheel adjustment, or the memory function

If children open a door, they could injure other persons or get out of the vehicle and injure themselves or be injured by following traffic. Do not expose the child restraint system to direct sunlight. The child restraint system's metal parts, for example, could become very hot, and the child could be burned on these parts.

Children in the vehicle

59

Child-proof locks for the rear doors G WARNING Children could open a rear door from inside the vehicle. This could result in serious injuries or an accident. Therefore, when children ride in the rear always secure the rear doors with the child-proof locks.

You secure each door individually with the child-proof locks on the rear doors. A door secured with a child-proof lock cannot be opened from inside the vehicle. When the vehicle is unlocked, the door can be opened from the outside.

X To activate: press the child-proof lock

lever up in the direction of arrow :.

X Make sure that the child-proof locks are

working properly.

X To deactivate: press the child-proof lock lever down in the direction of arrow ;.

Override feature for the rear side windows G WARNING When children ride on the vehicle's rear seats, activate the override switch. Otherwise, the children could be injured, e.g. by trapping themselves in the rear side window.

60 Driving safety systems

X To activate/deactivate: press button ;. If indicator lamp : is lit, operation of the rear side windows is deactivated. Operation is only possible using the switches in the driver's door. If indicator lamp : is off, operation is possible using the switches in the rear compartment.

Panic alarm

X To activate: press ! button : for at

least one second. An alarm sounds and the exterior lighting flashes.

X To deactivate: press ! button :

again.

or X Insert the SmartKey into the ignition lock. or X Press the KEYLESS-GO Start/Stop button.

The KEYLESS-GO key must be in the vehicle.

i USA only:

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause interference, and 2. this device must accept any interference received, including interference that may cause undesired operation. Any unauthorized modification to this device could void the user's authority to operate the equipment. The product label with FCC ID and IC certification number can be found in the battery case of the SmartKey.

i Canada only:

This device complies with RSS-Gen of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2. this device must accept any interference received, including interference that may cause undesired operation. Any unauthorized modification to this device could void the user's authority to operate the equipment. The product label with FCC ID and IC certification number can be found in the battery case of the SmartKey.

Driving safety systems Driving safety systems overview In this section, you will find information about the following driving safety systems: RABS (Anti-lock Braking System) RBAS (Brake Assist System) RBAS PLUS (Brake Assist System Plus*) RESP® (Electronic Stability Program) REBD (Electronic Brake force Distribution) RADAPTIVE BRAKE RPRE-SAFE® Brake

Important safety notes G WARNING The following factors increase the risk of accidents: RExcessive speed, especially in turns RWet and slippery road surfaces RFollowing another vehicle too closely The driving safety systems described in this section cannot reduce these risks or prevent the natural laws of physics from acting on the vehicle. They cannot increase braking or steering efficiency beyond that afforded by the condition of the vehicle brakes and tires or the traction afforded. Only a safe, attentive, and skillful driver can prevent accidents. The capabilities of a vehicle equipped with the driving safety systems described in this section must never be exploited in a reckless or dangerous manner which could jeopardize the user's safety or the safety of others. Always adjust your driving style to the prevailing road and weather conditions and keep a safe distance to other road users and objects on the street. If a driving system malfunctions, other driving safety systems may also switch off. Observe indicator and warning lamps that may come on as well as messages in the multifunction display that may appear.

i Please note that the driving safety

systems described only work as effectively as possible when there is adequate contact between the tires and the road surface. Pay particular attention to the information regarding tires, recommended minimum tire tread depths etc. in the "Wheels and tires" section (Y page 314). In wintry driving conditions, always use winter tires (M+S tires) and if necessary, snow chains. Only in this way will the driving safety systems described in this section work as effectively as possible.

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61

ABS (Anti-lock Braking System) Important safety notes i Observe the "Important safety notes"

section (Y page 61).

ABS regulates brake pressure in such a way that the wheels do not lock when you brake. This allows you to continue steering the vehicle when braking. ABS works from a speed of about 5 mph(8 km/h) upwards, regardless of road- surface conditions. ABS works on slippery surfaces, even when you only brake gently. G WARNING If the ABS malfunctions, other driving systems such as the BAS or the ESP® are also switched off. Observe indicator and warning lamps that may come on as well as messages in the multifunction display that may appear. If the ABS malfunctions, the wheels may lock during hard braking, reducing the steering capability and extending the braking distance.

The ! warning lamp in the instrument cluster lights up when the ignition is switched on. It goes out when the engine is running.

Braking If ABS intervenes when braking, you will feel a pulsing in the brake pedal. X If ABS intervenes: continue to depress the

brake pedal with force until the braking situation is over.

X To make a full brake application:

depress the brake pedal with full force.

The pulsating brake pedal can be an indication of hazardous road conditions, and functions as a reminder to take extra care while driving. G WARNING Do not pump the brake pedal. Use firm, steady brake pedal pressure instead. Pumping the brake pedal defeats the purpose of the ABS

62 Driving safety systems

and significantly reduces braking effectiveness.

BAS (Brake Assist System) i Observe the "Important safety notes"

section (Y page 61).

BAS operates in emergency braking situations. If you depress the brake pedal quickly, BAS automatically boosts the braking force, thus shortening the stopping distance. X Keep the brake pedal firmly depressed until

the emergency braking situation is over. ABS prevents the wheels from locking. The brakes will function as usual once you release the brake pedal. BAS is deactivated. G WARNING If the BAS malfunctions, the brake system still functions, but without the additional brake boost available that the BAS would normally provide in an emergency braking maneuver. Therefore, the braking distance may increase.

BAS PLUS (Brake Assist System Plus) BAS PLUS is only available in vehicles equipped with DISTRONIC PLUS. i Observe the "Important safety notes"

section (Y page 61).

At speeds above approximately 4 mph (7 km/h), BAS PLUS assists you when braking in hazardous situations and uses the radar sensor system to evaluate the traffic conditions. i This device has been approved by the FCC as a "Vehicular Radar System". The radar sensor system is intended for use in an automotive radar system only. Removal, tampering, or altering of the device will void any warranties, and is not permitted by the FCC. Do not tamper with, alter, or use in any non-approved way.

Any unauthorized modification to this device could void the user's authority to operate the equipment.

With the help of the radar sensor system, BAS PLUS can detect obstacles that are in the path of your vehicle for an extended period of time. At speeds up to approximately 40 mph (70 km/h), BAS PLUS can also detect stationary obstacles, for example stopped or parked vehicles. Should you approach an obstacle and BAS PLUS has detected a risk of collision, BAS PLUS calculates the braking force necessary to avoid a rear-end collision. RAt speeds up to approximately

20 mph(30 km/h): should you apply the brakes forcefully, BAS PLUS will automatically increase the braking force to a level suitable for the traffic conditions.

RAt speeds up to approximately

20 mph(30 km/h): should you apply the brakes, BAS PLUS is activated. Braking is performed as late as possible.

If BAS PLUS demands particularly high braking force, preventative passenger protection measures (PRE-SAFE®) are activated simultaneously. X Keep the brake pedal depressed until the

emergency braking situation is over. ABS prevents the wheels from locking.

The brakes will work normally again if: Ryou release the brake pedal. Rthere is no longer any danger of a rear-end

collision.

Rno obstacle is detected in front of your

vehicle.

BAS PLUS is then deactivated. For BAS PLUS to assist you when driving, the radar sensor system must be switched on and operational, see "Radar sensor system" in the index.

G WARNING BAS PLUS cannot always clearly identify objects and complex traffic situations. BAS PLUS cannot intervene in these cases. There is a risk of an accident. Always pay careful attention to the traffic situation and be ready to brake.

In particular, the detection of obstacles can be impaired if there is: Rdirt on the sensors or anything else

covering the sensors

Rsnow or heavy rain Rinterference by other radar sources Rthe possibility of strong radar reflections,

for example in parking garages

Ra narrow vehicle traveling in front, e.g. a

motorbike

Ra vehicle traveling in front on a different line G WARNING BAS PLUS does not react: Rto people or animals Rto oncoming vehicles Rto crossing traffic Rin curves As a result, BAS PLUS cannot intervene in critical situations. There is a risk of an accident. Always pay careful attention to the traffic situation and be ready to brake.

Following damage to the front end of the vehicle, have the configuration and operation of the radar sensors checked at a qualified specialist workshop. This also applies to collisions at slow speeds where there is no visible damage to the front of the vehicle. If BAS PLUS is not available due to a malfunction in the radar sensor system, the brake system remains available with full brake boosting effect and BAS.

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63

ESP® (Electronic Stability Program) Important safety notes i See the "Important safety notes" section

(Y page 61).

If ESP® detects that the vehicle is deviating from the direction desired by the driver, one or more wheels are braked to stabilize the vehicle. If necessary, the engine output is also modified to keep the vehicle on the desired course within physical limits. ESP® assists the driver when pulling away on wet or slippery roads. ESP® can also stabilize the vehicle during braking. If ESP® intervenes, the ÷ ESP® warning lamp flashes in the instrument cluster. G WARNING Under no circumstances should you deactivate ESP® when the ÷ ESP® warning lamp in the instrument cluster flashes. Proceed as follows: Rwhen driving off, apply as little throttle as

possible.

Rwhile driving, ease up on the accelerator

pedal.

Radapt your speed to suit the prevailing road

and weather conditions.

Failure to observe these guidelines could cause the vehicle to skid. ESP® cannot prevent accidents resulting from excessive speed.

! Vehicles without 4MATIC: switch the

ignition off when: Rthe parking brake is being tested using a

dynamometer

Rthe vehicle is being towed with the front

axle raised

Application of the brakes by ESP® may otherwise destroy the brake system.

! Vehicles with 4MATIC: switch off the

ignition when the parking brake is being tested on a brake dynamometer.

64 Driving safety systems

Application of the brakes by ESP® may otherwise destroy the brake system.

i Only use wheels with the recommended

tire sizes. Only then will ESP® function properly.

ETS/4ETS (Electronic Traction System) G WARNING Observe "Important safety notes" (Y page 60).

Traction control is part of ESP®. Traction control brakes the drive wheels individually if they spin. This enables you to pull away and accelerate on slippery surfaces, for example if the road surface is slippery on one side. On vehicles with 4MATIC, more drive torque is also transferred to the wheel or wheels with traction. Traction control remains active if you deactivate ESP®.

Deactivating/activating ESP® (except AMG vehicles) G WARNING ESP® should not be deactivated during normal driving other than in the circumstances described below. Disabling the system will reduce vehicle stability in driving maneuvers. Do not deactivate ESP® when the emergency or spare wheel is mounted.

ESP® is activated automatically when the engine is started. It may be best to deactivate ESP® in the following situations: Rwhen using snow chains Rin deep snow Ron sand or gravel G WARNING Switch on ESP® immediately if one of the previously stated conditions is no longer met.

Otherwise, ESP® cannot stabilize the vehicle if it begins to lurch or when a wheel spins.

If you deactivate ESP®: RESP® no longer improves driving stability. Rthe engine's torque is no longer limited and the drive wheels can spin. The spinning of the wheels results in a cutting action, which provides better grip.

Rtraction control is still activated. RESP® still provides support when you

brake.

If ESP® is deactivated and one or more wheels start to spin, the ÷ ESP® warning lamp in the instrument cluster flashes. In such situations, ESP® will not stabilize the vehicle. X To deactivate:(Y page 206).

The å ESP® OFF warning lamp in the instrument cluster lights up. G WARNING When the å ESP® OFF warning lamp is lit, ESP® is deactivated. If the ÷ ESP® warning lamp and the å ESP® OFF warning lamp remain lit, ESP® is not available due to a malfunction. When ESP® is deactivated or not operational, vehicle stability in standard driving maneuvers is reduced. Adapt your speed and driving to the prevailing road conditions and to the non-operating status of the ESP®.

! Avoid spinning the driven wheels for an extended period with ESP® deactivated. You could otherwise damage the drivetrain.

X To activate:(Y page 206).

The å ESP® OFF warning lamp in the instrument cluster goes out.

Deactivating/activating ESP® (AMG vehicles) Activating/deactivating SPORT handling mode G WARNING The SPORT handling mode should not be switched on during normal driving. Switching on the SPORT handling mode will result in the following: Rno restriction to the engine torque Rsystem supported traction control is

limited

The SPORT handling mode is designed for driving on closed tracks when the vehicle's own natural oversteer and understeer characteristics are desired and requires a highly skilled and experienced driver able to handle these critical driving situations. You could lose control of your vehicle and cause an accident. Please be aware of these limits when you switch on the SPORT handling mode. Do not switch on the SPORT handling when a spare wheel is mounted.

ESP® is activated automatically when the engine is started. It may be best to activate SPORT handling mode in the following situations: Rwhen using snow chains Rin deep snow Ron sand or gravel G WARNING Switch off the SPORT handling mode and switch on the ESP® immediately if the aforementioned circumstances do not apply anymore. Otherwise the SPORT handling mode will only stabilize the vehicle to a limited extent when it is starting to skid or a wheel is spinning.

Driving safety systems

65

When SPORT handling mode is activated: RESP® only improves driving stability to a

limited degree.

Rthe engine's torque is restricted only to a limited degree and the drive wheels can spin. The spinning of the wheels results in a cutting action, which provides better grip.

Rtraction control is still activated. RESP® still provides support when you brake

firmly.

If SPORT handling mode is activated and one or more wheels start to spin, the ÷ ESP® warning lamp in the instrument cluster flashes. ESP® only stabilizes the vehicle to a limited degree.

X To activate: briefly press button :.

The M SPORT handling mode warning lamp in the instrument cluster lights up. The SPORT handling mode message appears in the multifunction display.

X To deactivate: briefly press button :. The M SPORT handling mode warning lamp in the instrument cluster goes out.

Activating/deactivating ESP® G WARNING The ESP® should not be switched off during normal driving. Disabling of the system will result in the following: Rno restriction to engine torque Rloss of system-supported traction control

66 Driving safety systems

"ESP® OFF" is designed for driving on closed tracks when the vehicle's natural oversteer and understeer characteristics are desired and requires a highly skilled and experienced driver able to handle these critical driving situations. You could lose control of your vehicle and cause an accident. Please be aware of these limits when you switch off the ESP®. Do not switch off the ESP® when a spare wheel is mounted.

ESP® is activated automatically when the engine is started. It may be best to deactivate ESP® in the following situations: Rwhen using snow chains Rin deep snow Ron sand or gravel G WARNING Switch on ESP® immediately if one of the previously stated conditions is no longer met. Otherwise, ESP® cannot stabilize the vehicle if it begins to lurch or when a wheel spins.

If you deactivate ESP®: RESP® no longer improves driving stability. Rthe engine's torque is no longer limited and

the drive wheels are able to spin. The spinning of the wheels results in a cutting action, which provides better grip.

Rtraction control is still activated. RPRE-SAFE® is no longer available; it is also not activated if you brake firmly and ESP® intervenes.

RPRE-SAFE® Brake is no longer available; it is also not activated if you brake firmly and ESP® intervenes.

RESP® still provides support when you brake

firmly.

If ESP® is deactivated and one or more wheels start to spin, the ÷ ESP® warning lamp in

the instrument cluster does not flash. In such situations, ESP® will not stabilize the vehicle.

X To deactivate: press button : until the å ESP® OFF warning lamp lights up in the instrument cluster. The ÷OFF message appears in the multifunction display. G WARNING When the å ESP® OFF warning lamp is lit, ESP® is deactivated. If the ÷ ESP® warning lamp and the å ESP® OFF warning lamp remain lit, ESP® is not available due to a malfunction. When ESP® is deactivated or not operational, vehicle stability in standard driving maneuvers is reduced. Adapt your speed and driving to the prevailing road conditions and to the non-operating status of the ESP®.

! Avoid spinning the driven wheels for an extended period with ESP® deactivated. You could otherwise damage the drivetrain.

X To activate: briefly press button :. The å ESP® OFF warning lamp in the instrument cluster goes out. The ÷ON message appears in the multifunction display.

EBD (electronic brake force distribution) i Observe the "Important safety notes"

section (Y page 61).

EBD monitors and controls the brake pressure on the rear wheels to improve driving stability while braking. G WARNING If EBD has malfunctioned, the braking system remains available with full brake boosting effect. However, the rear wheels can still lock, e.g. under full braking. This could cause you to lose control of your vehicle and cause an accident. You should therefore adapt your driving style to the different handling characteristics.

X Observe the notes on warning and indicator

lamps (Y page 244) as well as display messages (Y page 218).

ADAPTIVE BRAKE ADAPTIVE BRAKE enhances braking safety and offers increased braking comfort. In addition to the braking function, ADAPTIVE BRAKE also has the HOLD function (Y page 166) and hill start assist (Y page 135). For further information, see Driving tips (Y page 152).

PRE-SAFE® Brake PRE-SAFE® Brake is only available in vehicles with DISTRONIC PLUS. i Observe the "Important safety notes"

section (Y page 61).

PRE-SAFE® Brake can help you to minimize the risk of a frontal collision with a vehicle ahead or reduce the effects of such a collision. If PRE-SAFE® Brake has detected a risk of collision, you will be warned visually and acoustically as well as by automatic

Driving safety systems

67

braking. PRE-SAFE® Brake cannot prevent a collision without your intervention. At speeds above approximately 4 mph (7 km/h), this function warns you when you are rapidly approaching the vehicle in front. An intermittent warning tone will then sound and the · distance warning lamp in the instrument cluster will light up. X Brake immediately in order to increase the

distance from the vehicle in front.

or X Take evasive action provided it is safe to do

so.

If the driver and front passenger have their seat belt fastened, PRE-SAFE® Brake can also brake the vehicle automatically at speeds from approximately 4 mph (7 km/h) to approximately 124 mph (200 km/h). Due to the nature of the system, particularly complicated driving conditions may cause unnecessary warnings or the unnecessary intervention of PRE-SAFE® Brake. To stop the braking action, you can either depress the accelerator pedal further, activate kickdown or release the brake pedal. The braking action of PRE-SAFE® Brake is ended automatically if: Ryou maneuver to avoid the obstacle. Rthere is no longer any danger of a rear-end

collision.

Rthere is no longer an obstacle detected in

front of your vehicle.

i USA only: this device has been approved by the FCC as a "Vehicular Radar System". The radar sensor system is intended for use in an automotive radar system only. Removal, tampering, or altering of the device will void any warranties, and is not permitted by the FCC. Do not tamper with, alter, or use in any non-approved way. Any unauthorized modification to this device could void the user's authority to operate the equipment.

68 Driving safety systems

i Canada only: this device complies with RSS-210 of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause interference, and 2. this device must accept any interference received, including interference that may cause undesired operation. Removal, tampering, or altering of the device will void any warranties, and is not permitted. Do not tamper with, alter, or use in any non-approved way. Any unauthorized modification to this device could void the user's authority to operate the equipment.

With the help of the radar sensor system, PRE-SAFE® Brake can detect obstacles that are in front of your vehicle for an extended period of time. At speeds up to approximately 40 mph (70 km/h), PRE-SAFE® Brake can also react to stationary obstacles, for example stopped or parked vehicles. If you approach an obstacle and PRE-SAFE® Brake detects a risk of collision, the system will initially alert you both visually and acoustically. If you do not brake or take evasive action, the system will warn you by automatically braking the vehicle gently. If there is an increased risk of collision, preventative passenger protection measures (PRE-SAFE®) are activated (Y page 48). If at speeds of more than approximately 20 mph (30 km/h) the risk of collision remains and you do not brake, take evasive action or accelerate significantly, the vehicle may perform automatic emergency braking. Automatic emergency braking is not performed until immediately prior to an accident that can no longer be avoided. G WARNING Even if PRE-SAFE® Brake slows the vehicle before an imminent rear-end collision, the system cannot avert a collision without the intervention of the driver. There is a risk of an

accident. Brake according to the situation or take evasive action. Delayed intervention by the driver can lead to an accident. G WARNING PRE-SAFE® Brake cannot always detect complex traffic situations properly. In these cases, PRE-SAFE(R) Brake may: Rgive an unnecessary warning and then

brake the vehicle

Rneither give a warning nor intervene There is a risk of an accident. Always pay particular attention to the traffic situation and be ready to brake, especially if PRE-SAFE(R) Brake warns you. Terminate the intervention in a non-critical driving situation.

In particular, the detection of obstacles can be impaired if there is: Rdirt on the sensors or anything else

covering the sensors

Rsnow or heavy rain Rinterference by other radar sources Rthe possibility of strong radar reflections,

for example in parking garages

Ra narrow vehicle traveling in front, e.g. a

motorbike

Ra vehicle traveling in front on a different line G WARNING PRE-SAFE® Brake does not react: Rto people or animals Rto oncoming vehicles Rto crossing traffic Rin curves As a result, PRE-SAFE® Brake cannot intervene in critical situations. There is a risk of an accident. Always pay careful attention to the traffic situation and be ready to brake.

In order to maintain the appropriate distance to the vehicle in front and thus prevent a collision, you must apply the brakes yourself.

X To activate/deactivate: activate or

deactivate PRE-SAFE® Brake in the on- board computer (Y page 207). The Ä symbol appears in the multifunction display as long as the HOLD function is not activated (Y page 166). On vehicles with Active Parking Assist, the Ä symbol is displayed when transmission position P is selected or if you drive faster than 22 mph(35 km/h).

For PRE-SAFE® Brake to assist you when driving, the radar sensor system must be switched on (Y page 211) and operational. Following damage to the front end of the vehicle, have the configuration and operation of the radar sensors checked at a qualified specialist workshop. This also applies to collisions at slow speeds where there is no visible damage to the front of the vehicle.

Theft deterrent locking systems Immobilizer The immobilizer prevents your vehicle from being started without the correct SmartKey. When leaving the vehicle, always take the SmartKey with you and lock the vehicle. The engine can be started by anyone with a valid SmartKey that is left inside the vehicle. X To activate with the SmartKey: remove

the SmartKey from the ignition lock.

X To activate with KEYLESS-GO: switch the

ignition off and open the driver's door. X To deactivate: switch on the ignition. i The immobilizer is always deactivated

when you start the engine. In the event that the engine cannot be started when the starter battery is fully charged, the immobilizer may be faulty. Contact an authorized Mercedes-Benz Center or call 1-800-FOR-MERCedes (in USA) or 1-800-387-0100 (in Canada).

Theft deterrent locking systems

69

ATA (Anti-Theft Alarm system) A visual and audible alarm is triggered if the alarm system is armed and you open: Ra door Rthe vehicle with the mechanical key Rthe trunk lid Rthe hood The alarm is not switched off, even if you close the open door that has triggered it, for example. i If the alarm stays on for more than 30

seconds, the emergency call system mbrace (USA only) or TELE AID (Canada only) initiates a call to the Customer Assistance Center automatically. The emergency call system initiates the call provided that: Ryou have subscribed to the mbrace/

TELE AID service.

Rthe mbrace/TELE AID service has been

activated properly.

Rthe required mobile phone, power supply

and GPS are available.

X To arm: lock the vehicle with the SmartKey

or KEYLESS-GO. Indicator lamp : flashes. The alarm system is armed after approximately 15
seconds.

X To deactivate: unlock the vehicle with the

SmartKey or KEYLESS-GO.

70

Theft deterrent locking systems

X To stop the alarm using the SmartKey: insert the SmartKey into the ignition lock. The alarm is switched off.

or X Press the % or & button on the

SmartKey. The alarm is switched off.

X To stop the alarm using KEYLESS-GO:

grasp the outside door handle. The SmartKey must be outside the vehicle. The alarm is switched off.

or X Press the Start/Stop button on the

dashboard. The SmartKey must be inside the vehicle. The alarm is switched off.

Useful information .............................. 72
SmartKey ............................................. 72
Doors .................................................... 79
Trunk .................................................... 82
Side windows ...................................... 86
Sliding sunroof .................................... 88

71

72

SmartKey

Useful information

i This Operator's Manual describes all models and all standard and optional equipment of your vehicle available at the time of publication of the Operator's Manual. Country-specific differences are possible. Please note that your vehicle may not be equipped with all features described. This also applies to safety- related systems and functions.

i You can find information on qualified specialist workshops here (Y page 22).

SmartKey Important safety notes G WARNING When leaving the vehicle, always remove the SmartKey from the ignition lock. Always take the SmartKey with you and lock the vehicle. Do not leave children unsupervised in the vehicle, even if they are secured in a child restraint system, and do not give them access to an unlocked vehicle. A child's unsupervised access to a vehicle could result in an accident and/or serious personal injury. They could: Rinjure themselves on vehicle parts Rbe seriously or fatally injured by extreme

heat or cold

Rinjure themselves or have an accident with

vehicle equipment that may still be in operation even after the SmartKey has been removed from the ignition, such as the seat adjustment, steering wheel adjustment or memory function.

If children open a door, they could cause severe or even fatal injury to other persons; if they get out of the vehicle, they could injure themselves when doing so or be seriously or even fatally injured by any passing traffic. Do not expose the child restraint system to direct sunlight. The child restraint system's metal parts, for example, could become very

hot, and a child could be burned on these parts. G WARNING If a key ring is too heavy or too large, the weight acting on the key could cause it to turn in the ignition lock or catch on the steering wheel. This could cause the engine to be switched off suddenly. You could lose control of the vehicle and cause an accident. Do not attach any heavy or large key rings to the key that is inserted in the ignition.

General information If you cannot lock or unlock the vehicle with the SmartKey, either the battery in the SmartKey is discharged, the SmartKey is faulty or the starter battery is discharged. X Check the battery in the SmartKey and

replace it if necessary (Y page 76). X Unlock the driver's door using the

mechanical key (Y page 81).

X Lock the vehicle using the mechanical key

(Y page 81).

X Have the starter battery and battery contacts checked at an authorized Mercedes-Benz Center.

If the SmartKey is faulty, contact Roadside Assistance or an authorized Mercedes-Benz Center.

SmartKey functions General notes i USA only:

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2. this device must accept any interference received, including interference that may cause undesired operation.

Any unauthorized modification to this device could void the user’s authority to operate the equipment. The Product label with FCC ID and IC certification number can be found in the battery case of the SmartKey.

i Canada only:

This device complies with RSS-210 of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause interference, and 2. this device must accept any interference received, including interference that may cause undesired operation of the device. Any unauthorized modification to this device could void the user’s authority to operate the equipment. The Product label with FCC ID and IC certification number can be found in the battery case of the SmartKey.

Locking and unlocking centrally The SmartKey centrally locks/unlocks: Rthe doors Rthe trunk lid Rthe fuel filler flap

: & To lock the vehicle ; F To unlock the trunk lid = % To unlock the vehicle When unlocking, the turn signals flash once. When locking, they flash three times.

SmartKey

73

When it is dark, the surround lighting also comes on if it is activated in the on-board computer (Y page 210). You can also set an audible signal to confirm that the vehicle has been locked or unlocked. The audible signal can be activated and deactivated using the on-board computer (Y page 211). X To unlock centrally: press the %

button.

If you do not open the vehicle within approximately 40 seconds of unlocking: Rthe vehicle is locked again. Rthe theft deterrent locking system is armed

again.

X To lock centrally: press the & button.

KEYLESS-GO General notes i USA only:

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2. this device must accept any interference received, including interference that may cause undesired operation. Any unauthorized modification to this device could void the user’s authority to operate the equipment. The product label with FCC ID and IC certification number can be found in the battery case of the SmartKey.

i Canada only:

This device complies with RSS-210 of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause interference, and

74

SmartKey

2. this device must accept any interference received, including interference that may cause undesired operation of the device. Any unauthorized modification to this device could void the user’s authority to operate the equipment. The product label with FCC ID and IC certification number can be found in the battery case of the SmartKey.

Important notes on the use of KEYLESS- GO RThe KEYLESS-GO key can be used like a

conventional key.

RYou can combine KEYLESS-GO functions

with those of a conventional key, e.g. unlock with KEYLESS-GO and lock with the & button.

RAlways carry your KEYLESS-GO key on your

person.

RDo not keep the KEYLESS-GO key together

with: - electronic devices, e.g. a mobile phone

or another key

- metallic objects, e.g. coins or metal foil. This can affect the functionality of KEYLESS-GO.

RWhen locking and unlocking using

KEYLESS-GO, the distance between the SmartKey and the corresponding door handle must not exceed 3 ft (1 m).

RIf the KEYLESS-GO key is removed from the vehicle, it is possible that the system may not recognize the SmartKey. The vehicle can then not be locked or started using KEYLESS-GO.

RIf the KEYLESS-GO key has been removed from the vehicle, e.g. if a passenger leaves the vehicle with a KEYLESS-GO key:

if the Start/Stop button is pressed or if an attempt is made to lock the vehicle using the outer door handle, the Key

Not Detected message will appear in the multifunction display. - while the engine is running, the red Key Not Detected message will appear in the multifunction display as you pull away. Find the KEYLESS-GO key and change its position in the vehicle. Carry the KEYLESS-GO key in your shirt pocket, for example.

RIf you have started the engine with the Start/Stop button, you can switch it off again by: - pressing the Start/Stop button again inserting the KEYLESS-GO key into the ignition lock if the vehicle is stationary and the automatic transmission is in park position P.

RYou could unlock the vehicle by mistake if the distance between the KEYLESS-GO key and the vehicle is less than 3 ft (1 m) and: - an exterior door handle is hit by a water

jet or

- you clean an exterior door handle.

RBear in mind that the engine can be started by any of the vehicle occupants if there is a KEYLESS-GO key in the vehicle.

X To unlock the vehicle: touch the inner

surface of the door handle.

X To lock the vehicle: touch sensor

surface :.

X Convenience closing feature: touch

recessed sensor surface ; for an extended period (Y page 87).

SmartKey

75

Mechanical key General notes If the vehicle can no longer be locked or unlocked with the SmartKey, use the mechanical key. If you use the mechanical key to unlock and open the driver's door or the trunk lid, the anti-theft alarm system will be triggered (Y page 69). There are several ways to turn off the alarm: X To turn the alarm off with the

SmartKey: press the % or & button on the SmartKey.

or X Insert the SmartKey into the ignition lock. or X To deactivate the alarm with KEYLESS-

GO: press the Start/Stop button in the ignition lock. The SmartKey must be in the vehicle.

or X Lock or unlock the vehicle using KEYLESS-

GO. The SmartKey must be outside the vehicle.

If you unlock the vehicle using the mechanical key, the fuel filler flap will not be unlocked automatically. X To unlock the fuel filler flap: insert the

SmartKey in the ignition lock.

Removing the mechanical key

If you pull on the handle of the trunk lid, only the trunk of the vehicle is unlocked.

Changing the settings of the locking system You can change the setting of the locking system in such a way that only the driver's door and the fuel filler flap are unlocked. This is useful if you frequently travel on your own. X To change the setting: press and hold

down the % and & buttons simultaneously for approximately six seconds until the battery check lamp (Y page 76) flashes twice.

i If the setting of the locking system is changed within the signal range of the vehicle, pressing the & or % button locks or unlocks the vehicle.

The SmartKey now functions as follows: X To unlock the driver's door: press the

% button once.

X To unlock centrally: press the %

button twice.

X To lock centrally: press the & button. The KEYLESS-GO function is changed as follows: X To unlock the driver's door: touch the inner surface of the door handle on the driver's door.

X To unlock centrally: touch the inner

surface of the door handle on the front- passenger door or the rear door.

X To lock centrally: touch the outer sensor

surface on one of the door handles.

Restoring the factory settings X Press the % and & buttons

simultaneously for approximately six seconds until the battery check lamp flashes twice.

76

SmartKey

X Push release catch : in the direction of the arrow and at the same time, remove mechanical key ; from the SmartKey.

SmartKey battery Important safety notes It is advisable to have batteries replaced at a qualified specialist workshop, e.g. at an authorized Mercedes-Benz Center. G WARNING Batteries contain toxic and caustic substances. For this reason, keep batteries out of the reach of children. If a battery has been swallowed, seek medical help immediately. G WARNING The SmartKey batteries contain perchlorate material, which may require special handling and regard for the environment. Observe government disposal guidelines. California residents, see www.dtsc.ca.gov/ HazardousWaste/Perchlorate/ index.cfm.

Checking the battery

X Changing the battery (Y page 76) i The battery can be obtained from any

authorized Mercedes-Benz Center.

i If the SmartKey battery is checked within the signal reception range of the vehicle, pressing the & or % button locks or unlocks the vehicle.

Changing the battery You require a CR 2025 3 V cell battery. X Take the mechanical key out of the

SmartKey (Y page 75).

X Press mechanical key ; into the opening

in the SmartKey in the direction of the arrow until battery tray cover : opens. When doing so, do not hold cover : shut.

X Remove battery tray cover :.

X Press the & or % button.

The SmartKey battery is working properly if battery check lamp : lights up briefly. If battery check lamp : does not light up briefly during the test, the SmartKey battery is discharged.

X Repeatedly tap the SmartKey against your

palm until battery = falls out.

X Insert the new battery with the positive terminal facing upwards. Use a lint-free cloth to do so.

X Make sure that the surface of the battery is free from lint, grease and all other forms of contamination.

X Insert the front tabs of battery tray cover : and then press to close it. X Insert the mechanical key into the

SmartKey.

X Check the function of all SmartKey buttons

on the vehicle.

SmartKey

77

78

SmartKey

Problems with the SmartKey Problem You cannot lock or unlock the vehicle using the SmartKey.

Possible causes/consequences and M Solutions The SmartKey battery is discharged or nearly discharged. X Try again to lock/unlock the vehicle using the remote control function of the SmartKey. Point the tip of the SmartKey at the driver's door handle from close range and press the %/ & button.

If this does not work: X Check the SmartKey battery and replace it if necessary

(Y page 76).

the mechanical key.

X Lock (Y page 81) or unlock (Y page 81) the vehicle using

You can no longer lock or unlock the vehicle using KEYLESS-GO.

The SmartKey is faulty. X Lock (Y page 81) or unlock (Y page 81) the vehicle using

the mechanical key.

X Have the SmartKey checked at a qualified specialist workshop. There is interference from a powerful source of radio waves. X Lock/unlock the vehicle using the remote control function of the SmartKey. Point the tip of the SmartKey at the driver's door handle from close range and press the %/& button.

There is a malfunction with KEYLESS-GO. X Lock/unlock the vehicle using the remote control function of the SmartKey. Point the tip of the SmartKey at the driver's door handle from close range and press the %/& button.

X Have KEYLESS-GO checked at a qualified specialist workshop. If this does not work: X Check the SmartKey battery and replace it if necessary

(Y page 76).

the mechanical key.

X Lock (Y page 81) or unlock (Y page 81) the vehicle using

You have lost a SmartKey.

X Have the SmartKey canceled at an authorized Mercedes-Benz

Center.

You have lost the mechanical key.

X Report the loss immediately to the vehicle insurers. X If necessary, have the locks changed as well. X Report the loss immediately to the vehicle insurers. X If necessary, have the locks changed as well.

Doors

79

Problem The engine cannot be started using the SmartKey.

Possible causes/consequences and M Solutions The on-board voltage is too low. X Switch off non-essential consumers, e.g. seat heating or interior

lighting, and try to start the engine again.

If this does not work: X Check the starter battery and charge it if necessary

(Y page 302).

or X Jump-start the vehicle (Y page 305). or X Consult a qualified specialist workshop. A door is open. Therefore, the SmartKey cannot be detected as easily. X Close the door and try to start the vehicle again. There is interference from a powerful source of radio waves. X Start your vehicle with the SmartKey in the ignition lock.

The engine cannot be started using KEYLESS- GO. The SmartKey is in the vehicle.

Doors Important safety notes G WARNING When leaving the vehicle, always remove the SmartKey from the ignition lock. Always take the SmartKey with you and lock the vehicle. Do not leave children unsupervised in the vehicle, even if they are secured in a child restraint system, and do not give them access to an unlocked vehicle. A child's unsupervised access to a vehicle could result in an accident and/or serious personal injury. They could: Rinjure themselves on vehicle parts Rbe seriously or fatally injured by extreme

heat or cold

Rinjure themselves or have an accident with

vehicle equipment that may still be in operation even after the SmartKey has been removed from the ignition, such as the seat adjustment, steering wheel adjustment or memory function.

If children open a door, they could cause severe or even fatal injury to other persons; if they get out of the vehicle, they could injure themselves when doing so or be seriously or even fatally injured by any passing traffic. Do not expose the child restraint system to direct sunlight. The child restraint system's metal parts, for example, could become very hot, and a child could be burned on these parts. G WARNING Do not carry heavy or hard objects in the passenger compartment or trunk unless they are firmly secured in place. Unsecured or improperly positioned cargo increases a child's risk of injury in the event of Rstrong braking maneuvers Rsudden changes of direction Ran accident

80 Doors

Unlocking and opening doors from the inside You can open a door from inside the vehicle even if it has been locked. You can only open the rear doors from inside the vehicle if they are not secured by the child-proof locks (Y page 59). Only open the door when the traffic situation permits. If the vehicle was previously locked with the SmartKey or with KEYLESS-GO, opening the vehicle from the inside will activate the anti- theft alarm system. Switch off the alarm (Y page 69).

X Pull door handle ;.

If the door is locked, locking knob : pops up. The door is unlocked and can be opened.

Centrally locking and unlocking the vehicle from the inside You can centrally lock or unlock the vehicle from the inside. The central locking/unlocking button does not lock or unlock the fuel filler flap. i You cannot unlock the vehicle centrally

from the inside if the vehicle has been locked with the SmartKey or KEYLESS-GO.

X To unlock: press button :. X To lock: press button ;.

If all the doors are closed, the vehicle locks.

You can open a front door from inside the vehicle even if it has been locked. Only open the door when the traffic situation permits. If the vehicle has been locked with the central locking button: Rand the SmartKey is set to its factory

setting, the entire vehicle is unlocked if a front door is opened from the inside

Rand the SmartKey is set to an individual

setting, only the front door that is opened from inside the vehicle is unlocked.

If the vehicle has been locked centrally with the SmartKey or with KEYLESS-GO, it is not unlocked when the release button for the central locking is used.

Automatic locking feature The vehicle locks automatically when the ignition is switched on and the wheels of the vehicle are turning at a speed of more than 9 mph (15 km/h). You could therefore be locked out when: Rthe vehicle is being pushed. Rthe vehicle is being towed. Rthe vehicle is being tested on a

dynamometer.

X To deactivate: press and hold button : for about five seconds until a tone sounds. X To activate: press and hold button ; for

about five seconds until a tone sounds. i If you press one of the two buttons and do not hear a tone, the relevant setting has already been selected.

You can also switch the automatic locking function on and off using the on-board computer (Y page 211).