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vehicle is unlocked, the door can be opened from the outside.
Children in the vehicle
71
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.
For the rear compartment, you can deactivate operation of:
Rthe rear side windows
Rthe cigarette lighter in the rear
Radjustment of the front-passenger seat
from the rear compartment
Rthe sunblinds:
in the roof
- of the rear window
- of the rear side windows
72 Driving safety systems
X To activate/deactivate: press button :.
If indicator lamp ; is lit, the rear- compartment functions are deactivated. The rear side windows can then only be operated using the switches on the driver's door. If indicator lamp ; is off, the functions are enabled. The rear side windows can be operated 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 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 HYBRID vehicles: It is imperative that you read the HYBRID Supplemental Operating Instructions included in your vehicle literature portfolio. You may otherwise not receive all necessary safety information and warning for the operation of your vehicle.
If you fail to adapt your driving style or become distracted, the driving safety systems can neither reduce the risk of accident nor override the laws of physics. Driving safety systems are merely aids designed to assist driving. You are responsible for the distance to the vehicle in front, for vehicle speed and for braking in good time. Always adapt your driving style to suit the prevailing road and weather conditions and maintain a safe distance from the vehicle in front. Drive carefully.
i 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 498).
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.
ABS (Anti-lock Braking System)
Important safety notes
i Observe the "Important safety notes"
section (Ypage 73).
Driving safety systems
73
G WARNING If ABS is faulty, the wheels could lock when braking. The steerability and braking characteristics may be severely impaired. Additionally, further driving safety systems are deactivated. There is an increased danger of skidding and accidents.
Drive on carefully. Have ABS checked immediately at a qualified specialist workshop.
When ABS is malfunctioning, other systems, including driving safety systems, will also become inoperative. Observe the information on the ABS warning lamp (Y page 428) and display messages which may be shown in the instrument cluster (Y page 391).
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 if you only brake gently. The ! warning lamp in the instrument cluster lights up when the ignition is switched on. It goes out when the engine is running.
Braking:
X If ABS intervenes: continue to depress the
brake pedal vigorously until the braking situation is over.
X To make a full brake application:
depress the brake pedal with full force.
If ABS intervenes when braking, you will feel a pulsing in the brake pedal.
The pulsating brake pedal can be an indication of hazardous road conditions and functions as a reminder to take extra care while driving.
74 Driving safety systems
BAS (Brake Assist System)
i Observe the "Important safety notes"
section (Y page 73).
G WARNING If BAS is malfunctioning, the braking distance in an emergency braking situation is increased. There is a risk of an accident.
In an emergency braking situation, depress the brake pedal with full force. ABS prevents the wheels from locking.
BAS operates in emergency braking situations. If you depress the brake pedal quickly, BAS automatically boosts the braking force, thus shortening the stopping distance.
The brakes will function as usual once you release the brake pedal. BAS is deactivated.
BAS PLUS (Brake Assist System Plus)
BAS PLUS is only available in vehicles equipped with DISTRONIC PLUS.
BAS PLUS can also react to stationary obstacles, e.g. stopped or parked vehicles, at speeds of up to approximately 40 mph (70 km/h).
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.
RFor speeds above 20 mph (30 km/h): if you apply the brakes forcefully, BAS PLUS automatically increases the braking force to a level suitable for the traffic conditions.
RFor speeds below 20 mph (30 km/h): if
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.
i Observe the "Important safety notes"
The brakes will work normally again if:
section (Y page 73).
BAS PLUS provides braking assistance in hazardous situations at speeds greater than 4 mph (7 km/h) and uses radar sensor technology to assess the traffic situation.
Ryou release the brake pedal.
Rthere is no longer any danger of arear-end
collision.
Rno obstacle is detected in front of your
vehicle.
i This device has been approved by the FCC
BAS PLUS is then deactivated.
as a "Vehicular Radar System". The radar sensor is intended for use in an automotive radar system only. Removing, altering or tampering with the device will void any warranties, and is not permitted by the FCC. Do not tamper with, alter, or use the device 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.
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 Adaptive Brake Assist cannot always clearly identify objects and complex traffic situations. In these cases, Adaptive Brake Assist may not intervene. There is a risk of an accident.
Always pay careful attention to the traffic situation and be ready to brake.
Driving safety systems
75
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
relative to the center of your vehicle
G WARNING BAS PLUS does not react:
Rto people or animals
Rto oncoming vehicles
Rto crossing traffic
Rwhen cornering
As a result, BAS PLUS may not intervene in all 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 low 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.
ESP® (Electronic Stability Program)
Important safety notes
G WARNING If ESP® is malfunctioning, ESP® is unable to stabilize the vehicle. Additionally, further driving safety systems are deactivated. This increases the risk of skidding and an accident.
Drive on carefully. Have ESP® checked at a qualified specialist workshop.
! Vehicles with 4MATIC: switch off the
ignition when the parking brake is being tested on a brake dynamometer.
Application of the brakes by ESP® may otherwise destroy the brake system.
Vehicles without 4MATIC: when towing your vehicle with the rear axle raised, it is important that you observe the notes on ESP®(Y page 491). ESP® is deactivated if theå warning lamp in the instrument cluster lights up continuously when the engine is running. If the ÷ warning lamp and the å warning lamp are lit continuously, ESP® is not available due to a malfunction.
Observe the information on warning lamps (Y page 431) and display messages which may be shown in the instrument cluster (Y page 391).
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. 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.
If ESP® intervenes:
X Do not deactivate ESP® under any
i Observe the "Important safety notes"
circumstances.
section (Y page 73).
X Only depress the accelerator pedal as far
as necessary when pulling away.
X Adapt your driving style to suit the
prevailing road and weather conditions.
76 Driving safety systems
i Only use wheels with the recommended
tire sizes. Only then will ESP® function properly.
ETS/4ETS (Electronic Traction System)
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®.
ESP® is activated automatically when the engine is started.
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.
It may be best to deactivate ESP® in the following situations:
Rwhen using snow chains
Rin deep snow
Ron sand or gravel
If you deactivate ESP®:
RESP® no longer improves driving stability.
Rtraction control is still activated.
RESP® still provides support when you
Deactivating/activating ESP®
brake.
i Observe the "Important safety notes"
section (Y page 73).
G WARNING If you deactivate ESP®, ESP® no longer stabilizes the vehicle. There is an increased risk of skidding and an accident.
Only deactivate ESP® in the situations described in the following.
! Avoid spinning the driven wheels for an extended period with ESP® deactivated. You could otherwise damage the drivetrain.
X To deactivate:(Y page 386).
The å ESP® OFF warning lamp in the instrument cluster lights up.
S 63 AMG: deactivate ESP® when driving on designated roads when the vehicle's own oversteering and understeering characteristics are desired. Driving without ESP® requires an extremely qualified and experienced driver who is able to cope with these critical driving conditions.
X To activate:(Y page 386).
The å ESP® OFF warning lamp in the instrument cluster goes out.
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.
Vehicles with ECO start/stop function: the ECO start/stop function switches the engine off automatically when the vehicle comes to a stop. The engine starts automatically when the driver wants to pull away again. ESP® remains in its previously selected status. Example: if ESP® was deactivated before the engine was switched off, ESP® remains deactivated when the engine is switched on again.
EBD (electronic brake force
distribution)
i Observe the "Important safety notes"
section (Y page 73).
G WARNING If EBD has malfunctioned, the rear wheels can still lock, e.g. under full braking. This increases the risk of skidding and an accident.
You should therefore adapt your driving style to the different handling characteristics. Have
the brake system checked at a qualified specialist workshop.
Observe information regarding indicator and warning lamps (Y page 428) as well as display messages (Y page 395).
EBD monitors and controls the brake pressure on the rear wheels to improve driving stability while braking.
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 346) and hill start assist (Y page 310).
PRE-SAFE® Brake
Driving safety systems
77
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.
You can prevent the intervention of the PRE- SAFE® Brake at any time by:
Rdepressing the accelerator pedal further
Ractivating kickdown
Rreleasing 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
i Observe the "Important safety notes"
front of your vehicle.
section (Y page 73).
PRE-SAFE® Brake is only available in vehicles with DISTRONIC PLUS.
PRE-SAFE® Brake can help you to minimize the risk of a 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 braking. PRE-SAFE® Brake cannot prevent a collision without your intervention.
Above a speed of around 4 mph (7 km/h), this function warns you if you are very quickly approaching a vehicle in front. An intermittent warning tone will then sound and the · distance warning lamp will light up in the instrument cluster.
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.
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 of up to 40 mph (70 km/h), PRE- SAFE® Brake can also detect 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, preventive passenger protection measures (PRE-SAFE®) are activated (Y page 59). If, at speeds over 20 mph (30 km/h), a risk of collision remains and you do not brake, take evasive action or significantly accelerate, automatic braking may be performed up to the level of emergency braking. Automatic emergency braking is not performed until
78 Driving safety systems
immediately prior to an accident that can no longer be avoided.
Rto crossing traffic
Rwhen cornering
G WARNING PRE-SAFE® Brake will initially brake your vehicle by a partial application of the brakes if a danger of collision is detected. There may be a collision unless you also brake. Automatic emergency braking cannot prevent a collision. There is a risk of an accident.
Always apply the brakes yourself and try to take evasive action.
G WARNING PRE-SAFE® Brake cannot always clearly identify objects and complex traffic conditions.
In these cases, PRE-SAFE® Brake may:
Rgive an unnecessary warning and then
brake the vehicle
Rnot give a warning or 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® 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
relative to the center of your vehicle
G WARNING PRE-SAFE® Brake does not react:
Rto people or animals
Rto oncoming vehicles
As a result, PRE-SAFE® Brake may neither give warnings nor intervene in all 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 386). After activation, the Ä symbol is displayed on the left in the instrument cluster.
For PRE-SAFE® Brake to assist you when driving, the radar sensor system must be switched on (Y page 389) and be 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 low speeds where there is no visible damage to the front of the vehicle.
i USA only: This device has been approved by the FCC as a "Vehicular Radar System". The radar sensor is intended for use in an automotive radar system only. Removing, altering or tampering with the device will void any warranties, and is not permitted by the FCC. Do not tamper with, alter, or use the device in any non-approved way.
Any unauthorized modification to this device could void the user's authority to operate the equipment.
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
Theft deterrent locking system 79
i If the alarm stays on for more than
30 seconds, the mbrace (USA only) or TELE AID (Canada only) emergency call system 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.
2. this device must accept any interference received, including interference that may cause undesired operation of the device.
Removal, tampering, or altering of the device will void any warranties, and is not permitted. Do not tamper with, alter, or use the device in any non-approved way.
Any unauthorized modification to this device could void the user's authority to operate the equipment.
Theft deterrent locking system
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
X To arm: lock the vehicle with the SmartKey
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.
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.
or KEYLESS-GO. Indicator lamp : flashes. The alarm system is armed after approximately 30 seconds.
X To disarm: unlock the vehicle with the
SmartKey or KEYLESS-GO.
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.
80
Theft deterrent locking system
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 .............................. 82
SmartKey ............................................. 82
Doors .................................................... 88
Trunk .................................................... 91
Side windows ...................................... 95
Sliding sunroof .................................... 98
81
82
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 Please read the information on qualified
specialist workshops (Y page 31).
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 may 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 notes
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 85).
X Unlock the driver's door using the
mechanical key (Y page 90).
X Lock the vehicle (Y page 91).
X Have the starter battery and the battery
contacts checked at a qualified specialist workshop.
If the SmartKey is faulty, contact Roadside Assistance or a qualified specialist workshop.
SmartKey functions
The SmartKey centrally locks/unlocks:
Rthe doors
Rthe trunk lid
Rthe fuel filler flap
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
SmartKey
83
KEYLESS-GO
Important notes on the use of KEYLESS-
GO
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.
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.
Locking and unlocking centrally
You can start, lock or unlock the vehicle using KEYLESS-GO. To do this, you only need carry the SmartKey with you. You can combine the KEYLESS-GO functions with those of a conventional key, e.g. using KEYLESS-GO to unlock and pressing the & button to lock.
When locking and unlocking using KEYLESS- GO, the distance between the SmartKey and the corresponding door handle must not exceed 3 ft (1 m).
KEYLESS-GO checks whether a valid key is in the vehicle by periodically establishing a radio connection between the vehicle and the key. This happens:
Rwhen the external door handles are
touched
: & Locks the vehicle ; F Unlocks the trunk lid = % Unlocks the vehicle
When unlocking, the turn signals flash once. When locking, they flash three times.
When it is dark, the surround lighting also comes on if it is activated in COMAND (Y page 268).
If you activate the acoustic locking confirmation function you will hear the following, depending on the date of production of the vehicle:
Ran acoustic signal when locking
or
Rone acoustic signal when unlocking and
three when locking.
The audible signal can be activated and deactivated using the on-board computer (Y page 388). X To unlock centrally: press the %
button.
If you do not open the vehicle within approximately 40 seconds of unlocking:
Rwhen starting the engine
Rwhile the vehicle is in motion
Rthe vehicle is locked again.
Rthe theft deterrent locking system is armed
again.
X To lock centrally: press the & button.
84
SmartKey
X To unlock the vehicle: pull 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 97).
If you pull on the handle of the trunk lid, only the trunk of the vehicle is unlocked.
If the vehicle has been parked for a long time, the sensor surfaces are deactivated automatically. In order to unlock the door, pull the door handle. In order to reactivate the sensor surface, switch the ignition on again.
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 flashes twice (Y page 85).
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 KEYLESS-GO function is changed as follows:
X To unlock the driver's door: pull the door
handle on the driver's door.
X To unlock centrally: pull the door handle on the front-passenger door or on the rear doors.
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.
Mechanical key
General notes
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 79).
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.
The SmartKey now functions as follows:
or
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.
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.
Removing the mechanical key
Checking the battery
SmartKey
85
X Push release catch : in the direction of the arrow and at the same time, remove mechanical key ; from the SmartKey.
X Press the & or % button.
The battery is working properly if battery check lamp : lights up briefly
SmartKey battery
Important safety notes
If battery check lamp : does not light up briefly during the test, the battery is discharged.
X Changing the battery (Y page 85)
Have the batteries changed at a qualified specialist workshop.
i You can obtain the battery at a qualified
specialist workshop.
i If the SmartKey battery is checked within
the signal reception range of the vehicle, pressing the & or % button locks or unlocks the vehicle.
Replacing the battery
You require a CR 2025 3 V cell battery.
X Take the mechanical key out of the
SmartKey (Y page 84).
G WARNING Batteries contain toxic substances.
Swallowing batteries can lead to serious health issues or death.
Keep batteries out of the reach of children. Seek medical attention immediately if a battery is swallowed.
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.
X Press mechanical key ; into the opening
in the SmartKey in the direction of the
86
SmartKey
arrow until battery tray cover : opens. When doing so, do not hold cover : shut.
X Remove battery tray cover :.
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.
Problems with the SmartKey
Problem
Possible causes/consequences and M Solutions
SmartKey
87
You cannot lock or unlock the vehicle using the SmartKey.
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 (Y page 85) and replace it if
necessary (Y page 85).
X Lock (Y page 90) or unlock (Y page 91) the vehicle using
the mechanical key.
The SmartKey is faulty.
X Lock (Y page 90) or unlock (Y page 91) the vehicle using
the mechanical key.
X Have the SmartKey checked at a qualified specialist workshop.
You can no longer lock or unlock the vehicle using KEYLESS-GO.
KEYLESS-GO is in standby mode because the vehicle has not been unlocked for an extended period.
X Pull the door handle twice and then insert the SmartKey into the
ignition lock.
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 (Y page 85) and replace it if
necessary (Y page 85).
X Lock (Y page 90) or unlock (Y page 91) the vehicle using
the mechanical key.
You have lost a SmartKey.
X Have the SmartKey deactivated at a qualified specialist
workshop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well.
88 Doors
Problem
Possible causes/consequences and M Solutions
You have lost the mechanical key.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well.
The engine cannot be started using the SmartKey.
The on-board voltage is too low.
X Remove the SmartKey and reinsert it into the ignition lock.
X Start the engine within 30 seconds of inserting the SmartKey
into the ignition lock.
X Repeat if necessary.
If the engine does not start after several attempts:
X Check the starter battery and charge it if necessary
(Y page 484).
or
X Jump-start the vehicle (Y page 488).
or
X Consult a qualified specialist workshop.
The engine cannot be started using KEYLESS- GO. The SmartKey is in the vehicle.
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.
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.
Doors
89
G WARNING Do not carry heavy or hard objects in the passenger compartment 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
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.
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 71).
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 79).
X Pull door handle ;.
If the door is locked, locking knob : pops up. The door is unlocked and can be opened.
X To unlock: press button :. X To lock: press button ;.
If the front-passenger door is 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
When the ignition is switched on and the wheels of the vehicle are turning at a speed
90 Doors
of more than 9 mph (15 km/h), the vehicle locks automatically.
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.
You can switch off the automatic locking function via COMAND (Y page 269).
X Power closing feature (doors): push the
door past the first detent position of the lock. The power closing feature will pull the door fully closed.
X Power closing feature (trunk lid): lightly
push the trunk lid closed. The power closing feature will pull the trunk lid fully closed.
Power closing feature
The power closing feature pulls the doors and trunk lid into their locks automatically even if they are only partly closed.
G WARNING To prevent possible personal injury, always keep hands and fingers away from the door or trunk opening when closing a door or the trunk lid. Be especially careful when small children are around.
If danger threatens, pull the inside or outside door handle, or pull the trunk lid handle.
To prevent personal injury, never activate the closing assist mechanism by tampering with the door or trunk lid latch.
G WARNING Only drive with the doors closed. Otherwise, one or more of the doors could open while the vehicle is in motion, putting you and/or others at risk.
G WARNING Make sure the trunk lid is closed when the engine is running and while driving. Among other dangers, deadly carbon monoxide (CO) gases may enter the vehicle interior resulting in unconsciousness and death.
Unlocking the driver's door
(mechanical key)
If the vehicle can no longer be unlocked with the SmartKey, use the mechanical key.
If you use the mechanical key to unlock and open the driver's door, the anti-theft alarm system will be triggered (Y page 79).
X Take the mechanical key out of the
SmartKey (Y page 84).
X Insert the mechanical key into the lock of
the driver's door as far as it will go.
X Firmly turn the mechanical key
counterclockwise as far as it will go to position 1 and hold it in this position.
X Pull the door handle quickly.
The locking knob pops up.
The door is unlocked.
X Turn the mechanical key back and remove
it.
X Pull the door handle again.
X Insert the mechanical key into the
SmartKey.
Locking the vehicle
If the vehicle can no longer be locked with the SmartKey, you can lock it by taking the following steps. If the central locking in the vehicle is malfunctioning, you cannot lock the trunk.
X Press down the locking knobs on the open
rear doors.
X Close the rear doors.
X Open the front-passenger door.
X Close the driver's door and the trunk lid.
X Press down the locking knob of the driver's
door inside the vehicle.
X Press down the locking knob of the open
front-passenger door.
i Make sure that you have the SmartKey on your person and that it has not been left in the vehicle.
X Close the front-passenger door.
X Make sure that the doors and the trunk are
locked.
i If you lock the vehicle as described above,
the fuel filler flap is not locked. The anti- theft alarm system is not armed.
Trunk
Important safety notes
Do not leave the SmartKey in the trunk. You could otherwise lock yourself out.
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91
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
G WARNING Make sure the trunk lid is closed when the engine is running and while driving. Among other dangers, deadly carbon monoxide (CO)
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Trunk
gases may enter the vehicle interior resulting in unconsciousness and death.
! The trunk lid swings upwards when
opened. Therefore, make sure that there is sufficient clearance above the trunk lid.
You can limit the opening angle of the trunk lid. This could be useful, for example, if there is insufficient space above the trunk lid. You can switch the Trunk Opening-height Restriction function on or off via COMAND (Y page 269).
To open the trunk lid completely, a minimum clearance of 5.90 ft (1.80 m) above the ground is necessary.
Vehicles without trunk lid remote closing feature: the trunk lid can be:
Ropened and closed manually from outside
Ropened automatically from outside
Ropened automatically from inside
Rlocked separately
Runlocked with the mechanical key
Ropened with the emergency release button
Vehicles with trunk lid remote closing feature: the trunk lid can be:
Ropened and closed manually from outside
Ropened and closed automatically from
outside
Ropened and closed automatically from
inside
Rlocked separately
Runlocked with the mechanical key
Ropened with the emergency release button
Opening and closing manually
Opening
X Press the % button on the SmartKey.
X Pull handle :.
X Raise the trunk lid.
Closing
G WARNING To prevent possible personal injury, always keep hands and fingers away from the trunk opening when closing the trunk lid. Be especially careful when small children are around.
X Pull the trunk lid down using recess :.
X If necessary, lock the vehicle with the & button on the SmartKey (Y page 82) or with KEYLESS-GO (Y page 83).
i If a KEYLESS-GO key is detected in the trunk, the trunk lid cannot be locked and then opens again.
Opening/closing automatically from
outside
Important safety notes
G WARNING Make sure the trunk lid is closed when the engine is running and while driving. Among other dangers, deadly carbon monoxide (CO) gases may enter the vehicle interior resulting in unconsciousness and death.
! The trunk lid swings upwards when
opened. Therefore, make sure that there is sufficient clearance above the trunk lid.
To open the trunk lid completely, a minimum clearance of 5.90 ft (1.80 m) above the ground is necessary.
Opening
You can open the trunk lid using the SmartKey. X Press and hold the F button on the
SmartKey until the trunk lid opens.
Closing
G WARNING Monitor the closing procedure carefully to make sure no one is in danger of being injured. To prevent possible personal injury, always keep hands and fingers away from the trunk opening when closing the trunk lid. Be especially careful when small children are around. To stop the closing procedure, do one of the following: RPress button F on the SmartKey.
RPress the remote trunk opening/closing
switch (on the driver's door).
RPress the trunk closing switch.
RPress the KEYLESS-GO locking/closing
switch.
RPull the trunk lid handle.
Trunk
93
Even with the SmartKey removed from the starter switch or the SmartKey with KEYLESS- GO removed from the vehicle, the remote trunk opening/closing switch can be operated. Therefore, do not leave children unattended in the vehicle, 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.
You can close the trunk lid automatically by using the closing button3 or locking button4.
X To close: press closing button : in the
trunk lid.
X To close and lock simultaneously:
Press locking button ; in the trunk lid.
i If you leave a KEYLESS-GO key in the
trunk, the trunk lid will not lock.
Opening/closing automatically from
inside
G WARNING Maintain sight of the area around the rear of the vehicle while operating the trunk lid with the door mounted switch. Monitor the closing procedure carefully to make sure no one is in danger of being injured.
To interrupt the closing procedure, release the door mounted remote trunk opening/ closing switch again.
3 For vehicles with the trunk lid remote closing feature only. 4 For vehicles with the trunk lid remote closing feature and KEYLESS-GO only.
94
Trunk
Even with the SmartKey removed from the starter switch or the SmartKey with KEYLESS- GO removed from the vehicle, the remote trunk opening/closing switch can be operated. Therefore, do not leave children unattended in the vehicle, 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.
G WARNING Make sure the trunk lid is closed when the engine is running and while driving. Among other dangers, deadly carbon monoxide (CO) gases may enter the vehicle interior resulting in unconsciousness and death.
You can open and close the trunk lid from the driver's seat when the vehicle is stationary and unlocked.
X To open: press remote operating switch for
trunk lid : until the trunk lid opens.
X Insert the mechanical key into the trunk lid
lock as far as the stop.
X Turn the mechanical key clockwise from
position 1 to position 2.
X Remove the mechanical key.
X Insert the mechanical key into the
SmartKey.
Unlocking the trunk (mechanical key)
! The trunk lid swings upwards when
opened. Therefore, make sure that there is sufficient clearance above the trunk lid.
If the trunk cannot be unlocked with the SmartKey or KEYLESS-GO, use the mechanical key.
If you use the mechanical key to unlock and open the trunk lid, the anti-theft alarm system will be triggered (Y page 79).
X Take the mechanical key out of the
SmartKey (Y page 84).
X To close: press remote operating switch
for trunk lid : until the trunk lid is closed.
X Insert the mechanical key into the trunk lid
lock as far as the stop.
Locking the trunk separately
You can lock the trunk separately. If you then unlock the vehicle centrally, the trunk remains locked and cannot be opened.
X Close the trunk lid.
X Take the mechanical key out of the
SmartKey (Y page 84).
Side windows
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