mode. Also, reverse can be played slowly by pressing the play/pause button and then pressing the fast reverse button. To cancel slow play mode, press the play/pause button. t (Previous Track/Chapter): Press this button to return to the start of the current track or chapter. Press this button again to go to the previous track or chapter. This button might not work when the DVD is playing the copyright information or the previews. u (Next Track/Chapter): Press this button to go to the beginning of the next chapter or track. This button might not work while the DVD is playing the copyright information or the previews.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (43,1)
r (Fast Reverse): Press this button to quickly reverse the DVD or CD. To stop fast reversing a DVD video, press the play/pause button. To stop fast reversing a DVD audio or CD, release the fast reverse button. This button might not work when the DVD is playing the copyright information or the previews. [ (Fast Forward): Press this button to fast forward the DVD or CD. To stop fast forwarding a DVD video, press the play/pause button. To stop fast forwarding a DVD audio or CD, release the fast forward button. This button might not work while the DVD is playing the copyright information or the previews. e (Audio): Press this button to change audio tracks on DVDs that have this feature when the DVD is playing. The format and content of this function vary for each disc.
{ (Subtitles): Press this button to turn on or off subtitles and to move through subtitle options when a DVD is playing. The format and content of this function vary for each disc. AUX (Auxiliary): Press this button to switch the system between the DVD player and an auxiliary source. 2 (Camera): Press this button to change camera angles on DVDs that have this feature while a DVD is playing. The format and content of this function vary for each disc. 1 through 0 (Numeric Keypad): The numeric keypad provides the capability of direct chapter or track number selection. \ (Clear): Press this button within three seconds after entering a numeric selection, to clear all numerical inputs.
Infotainment System 7-43
} 10 (Double Digit Entries): Press this button to select chapter or track numbers greater than nine. Press this button before entering the number.
Battery Replacement To change the remote control batteries, do the following: 1. Slide the rear cover back on the
remote control.
2. Replace the two batteries in the
compartment. Make sure they are installed correctly using the diagram on the inside of the remote control.
3. Replace the battery cover. If the remote control is to be stored for a long period of time, remove the batteries and keep them in a cool, dry place.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (44,1)
7-44
Infotainment System
Tips and Troubleshooting Chart
Problem
Recommended Action
There is no power.
The picture does not fill the screen. There are black borders on the top and bottom or on both sides, or the picture looks stretched out. In auxiliary mode, the picture moves or scrolls. The remote control does not work.
After stopping the player, and pushing Play, sometimes the DVD starts where it left off and sometimes at the beginning.
The auxiliary source is running, but there is no picture or sound.
The ignition might not be turned to ON/RUN or ACC/ACCESSORY. Check the display mode settings in the setup menu by pressing the display menu button on the remote control.
Check the auxiliary input connections at both devices. Check to make sure there is no obstruction between the remote control and the transmitter window. Check the batteries to make sure they are not dead or installed incorrectly. If the stop button was pressed one time, the DVD player resumes playing where the DVD was stopped. If the stop button was pressed two times, the DVD player begins to play from the beginning of the DVD. Check that the RSE video screen is in the auxiliary source mode. Check the auxiliary input connections at both devices.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (45,1)
Infotainment System 7-45
Tips and Troubleshooting Chart (cont'd)
Problem
Recommended Action
Sometimes the wireless headphone audio cuts out or buzzes.
The remote and/or the headphones are lost. The DVD is playing, but there is no picture or sound.
Check for obstructions, low batteries, reception range, and interference from cellular telephone towers, or use a cellular telephone in the vehicle. Check that the headphones are on correctly using the L (left) and R (right) on the headphones. See your dealer for assistance. Check that the RSE video screen is sourced to the DVD player.
DVD Display Error Messages The DVD display error message depends on the radio that is in the vehicle. The video screen can display one of the following: Disc Load/Eject Error: This message displays when there are disc load or eject problems. Disc Format Error: This message displays if the disc is inserted with the disc label wrong side up, or if the disc is damaged.
Disc Region Error: This message displays if the disc is not from a correct region. No Disc Inserted: This message displays if no disc is present when EJECT or DVD AUX is pressed on the radio. DVD Distortion Video distortion can occur when operating cellular phones, scanners, CB radios, Global Position Systems (GPS)*, two-way radios, mobile fax machines, or walkie talkies.
It might be necessary to turn off the DVD player when operating one of these devices in or near the vehicle. *Excludes the OnStar® System. Cleaning the RSE Overhead Console When cleaning the RSE overhead console surface, use only a clean cloth dampened with clean water.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (46,1)
7-46
Infotainment System
Cleaning the Video Screen When cleaning the video screen, use only a clean cloth dampened with clean water. Use care when directly touching or cleaning the screen, as damage could result.
Rear Seat Audio (RSA) System Vehicles with this feature allow the rear seat passengers to listen to and control any of the music sources: radio, CDs, DVDs, or other auxiliary sources. However, the rear seat passengers can only control the music sources the front seat passengers are not listening to (except on some radios where dual control is allowed). For example, rear seat passengers can control and listen to a CD through the headphones, while the driver listens to the radio through the front speakers. The rear seat passengers have control of the volume for each set of headphones.
The radio functionality is controlled by both the RSA and the front radio. Only one band can be tuned to at one time. Changing the band on the RSA or the front radio will change the band on the other system, if they are both sourced to the radio. The RSA functions can be used even while the main radio is off. The front audio system will display the headphone icon when the RSA is on, and it will disappear from the display when the RSA is off. Audio can be heard through wired headphones (not included) plugged into the jacks on the RSA. If the vehicle has this feature, audio can also be heard on Channel 2 of the wireless headphones. Depending on the audio system, the rear speakers may continue to play when the RSA audio is active through the headphones. To listen to an iPod or portable audio device through the RSA, attach the iPod or portable audio device to the front auxiliary input
(if available), located on the front audio system. Turn the iPod on, then choose the front auxiliary input with the RSA SRCE button.
P (Power): Press this button to turn the RSA on or off. Volume: To increase or decrease headphone volume, turn the knobs located next to the SRCE or PROG buttons. The left knob controls the left headphones and the right knob controls the right headphones. SRCE (Source): Press this button to switch between the radio (AM‐FM), XM™ (if equipped), CD, and if the vehicle has these features, DVD, front auxiliary, and rear auxiliary.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (47,1)
© ¨ (Seek): When listening to FM, AM, or XM™ (if equipped), press the seek arrows to go to the previous or to the next station or channels and stay there. This function is inactive, with some radios, if the front seat passengers are listening to the radio. Press and hold either seek arrow until the display flashes, to tune to an individual station. The display stops flashing after the buttons have not been pushed for more than two seconds. This function is inactive, with some radios, if the front seat passengers are listening to the radio.
While listening to a disc, press the left seek arrow to go back to the start of the current track or chapter (if more than 10 seconds have played). Press the right seek arrow to go the next track or chapter on the disc. This function is inactive, with some radios, if the front seat passengers are listening to the disc. While a DVD video menu is being displayed, press either seek arrow to perform a cursor up or down on the menu. Hold either seek arrow to perform a cursor left or right on the menu. PROG (Program): Press this button to go to the next preset radio station or channel set on the main radio. This function is inactive, with some radios, if the front seat passengers are listening to the radio.
Infotainment System 7-47
While a CD or DVD‐A disc is playing, press this button to go to the beginning of the CD or DVD‐A. This function is inactive, with some radios, if the front seat passengers are listening to the CD or DVD‐A. While a disc is playing in the CD or DVD changer, press this button to select the next disc, if multiple discs are loaded. This function is inactive, with some radios, if the front seat passengers are listening to the disc. While a DVD video menu is being displayed, press the PROG button to perform the menu function, Enter.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (48,1)
7-48
Infotainment System
Phone
Bluetooth For vehicles equipped with Bluetooth capability, the system can interact with many cell phones, allowing: . Placement and receipt of calls in
a hands-free mode.
. Sharing of the cell phone’s
address book or contact list with the vehicle.
To minimize driver distraction, before driving, and with the vehicle parked: . Become familiar with the
features of the cell phone. Organize the phone book and contact lists clearly and delete duplicate or rarely used entries. If possible, program speed dial or other shortcuts.
. Review the controls and
operation of the infotainment system.
. Pair cell phone(s) to the vehicle.
The system may not work with all cell phones. See “Pairing” in this section for more information. If the cell phone has voice dialing capability, learn to use that feature to access the address book or contact list. See “Voice Pass-Thru” in this section for more information.
. See “Storing and Deleting Phone
Numbers” in this section for more information.
{ WARNING
When using a cell phone, it can be distracting to look too long or too often at the screen of the phone or the infotainment (navigation) system. Taking your eyes off the road too long or too often could cause a crash resulting in injury or death. Focus your attention on driving.
A Bluetooth system can use a Bluetooth‐capable cell phone with a Hands‐Free Profile to make and receive phone calls. The system can be used while the key is in the ON/RUN or ACC/ACCESSORY position. The range of the Bluetooth system can be up to 9.1 m (30 ft). Not all phones support all functions, and not all phones work with the in-vehicle Bluetooth system. See www.gm.com/bluetooth for more information on compatible phones. Voice Recognition The Bluetooth system uses voice recognition to interpret voice commands to dial phone numbers and name tags. For additional information, say “Help” while you are in a voice recognition menu. Noise: Keep interior noise levels to a minimum. The system may not recognize voice commands if there is too much background noise.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (49,1)
When to Speak: A short tone sounds after the system responds indicating when it is waiting for a voice command. Wait until the tone and then speak. How to Speak: Speak clearly in a calm and natural voice. Audio System When using the in‐vehicle Bluetooth system, sound comes through the vehicle's front audio system speakers and overrides the audio system. Use the audio system volume knob, during a call, to change the volume level. The adjusted volume level remains in memory for later calls. To prevent missed calls, a minimum volume level is used if the volume is turned down too low.
Bluetooth Controls Use the buttons located on the steering wheel to operate the in‐vehicle Bluetooth system. See Steering Wheel Controls on page 5‑2 for more information. b / g (Push To Talk): Press to answer incoming calls, confirm system information, and start speech recognition. c / x (End): Press to end a call, reject a call, or cancel an operation. Pairing A Bluetooth enabled cell phone must be paired to the Bluetooth system and then connected to the vehicle before it can be used. See the cell phone manufacturer's user guide for Bluetooth functions before pairing the cell phone. If a Bluetooth phone is not connected, calls will be made using OnStar Hands‐Free Calling, if equipped. See OnStar Overview on page 14‑1 for more information.
Infotainment System 7-49
Pairing Information
. A Bluetooth phone with MP3
capability cannot be paired to
the vehicle as a phone and an
MP3 player at the same time.
. Up to five cell phones can be
paired to the Bluetooth system. The pairing process is disabled when the vehicle is moving.
. Pairing only needs to be
completed once, unless the pairing information on the cell phone changes or the cell phone is deleted from the system.
. Only one paired cell phone can be connected to the Bluetooth system at a time. If multiple paired cell phones are within range of the system, the system connects to the first available paired cell phone in the order that they were first paired to the system. To connect to a different paired phone, see “Connecting to a Different Phone” later in this section.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (50,1)
7-50
Infotainment System
Pairing a Phone 1. Press and hold b / g for
two seconds.
2. Say “Bluetooth.” This command
can be skipped.
3. Say “Pair.” The system responds with instructions and a four‐digit Personal Identification Number (PIN). The PIN is used in Step 5.
4. Start the pairing process on the cell phone that you want to pair. For help with this process, see the cell phone manufacturer's user guide.
5. Locate the device named “Your
Vehicle” in the list on the cell phone. Follow the instructions on the cell phone to enter the PIN provided in Step 3. After the PIN is successfully entered, the system prompts you to provide a name for the paired cell phone. This name will be used to indicate which phones are paired and connected to the vehicle. The system responds
with “
3. Say “Delete.” The system asks
which phone to delete.
4. Say the name of the phone you
6. Repeat Steps 1 through 5 to pair
want to delete.
additional phones.
Listing All Paired and Connected Phones The system can list all cell phones paired to it. If a paired cell phone is also connected to the vehicle, the system responds with “is connected” after that phone name. 1. Press and hold b / g for
two seconds.
2. Say “Bluetooth.” 3. Say “List.”
Deleting a Paired Phone If the phone name you want to delete is unknown, see “Listing All Paired and Connected Phones.” 1. Press and hold b / g for
two seconds.
2. Say “Bluetooth.”
Connecting to a Different Phone To connect to a different cell phone, the Bluetooth system looks for the next available cell phone in the order in which all the available cell phones were paired. Depending on which cell phone you want to connect to, you may have to use this command several times. 1. Press and hold b / g for
two seconds.
2. Say “Bluetooth.” 3. Say “Change phone.”
If another cell phone is
found, the response will be
“
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (51,1)
Storing and Deleting Phone Numbers The system can store up to 30 phone numbers as name tags in the Hands‐Free Directory that is shared between the Bluetooth and OnStar systems, if equipped. The following commands are used to delete and store phone numbers. Store: This command will store a phone number, or a group of numbers as a name tag. Digit Store: This command allows a phone number to be stored as a name tag by entering the digits one at a time. Delete: This command is used to delete individual name tags. Delete All Name Tags: This command deletes all stored name tags in the Hands‐Free Calling Directory and the OnStar Turn‐by‐Turn Destinations Directory, if equipped.
Using the “Store” Command 1. Press and hold b / g for
two seconds. 2. Say “Store.” 3. Say the phone number or group of numbers you want to store all at once with no pauses, then follow the directions given by the system to save a name tag for this number.
Using the “Digit Store” Command If an unwanted number is recognized by the system, say “Clear” at any time to clear the last number. To hear all of the numbers recognized by the system, say “Verify” at any time. 1. Press and hold b / g for
two seconds.
2. Say “Digit Store.” 3. Say each digit, one at a time,
that you want to store. After each digit is entered, the system
Infotainment System 7-51
repeats back the digit it heard followed by a tone. After the last digit has been entered, say “Store,” and then follow the directions given by the system to save a name tag for this number.
Using the “Delete” Command 1. Press and hold b / g for
two seconds. 2. Say “Delete.” 3. Say the name tag you want to
delete.
Using the “Delete All Name Tags” Command This command deletes all stored name tags in the Hands‐Free Calling Directory and the OnStar Turn‐by‐Turn Destinations Directory, if equipped. To delete all name tags: 1. Press and hold b / g for
two seconds.
2. Say “Delete all name tags.”
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (52,1)
7-52
Infotainment System
Listing Stored Numbers The list command will list all stored numbers and name tags.
Using the “List” Command 1. Press and hold b / g for
two seconds.
2. Say “Directory.” 3. Say “Hands‐Free Calling.” 4. Say “List.” Making a Call Calls can be made using the following commands. Dial or Call: The dial or call command can be used interchangeably to dial a phone number or a stored name tag. Digit Dial: This command allows a phone number to be dialed by entering the digits one at a time. Re‐dial: This command is used to dial the last number used on the cell phone.
Using the “Dial” or “Call” Command 1. Press and hold b / g for
two seconds.
2. Say “Dial” or “Call.” 3. Say the entire number without pausing, or say the name tag.
Once connected, the person called will be heard through the audio speakers.
Using the “Digit Dial” Command The digit dial command allows a phone number to be dialed by entering the digits one at a time. After each digit is entered, the system repeats back the digit it heard followed by a tone. If an unwanted number is recognized by the system, say “Clear” at any time to clear the last number.
To hear all of the numbers recognized by the system, say “Verify” at any time. 1. Press and hold b / g for
two seconds.
2. Say “Digit Dial.” 3. Say each digit, one at a time,
that you want to dial. After each digit is entered, the system repeats back the digit it heard followed by a tone. After the last digit has been entered, say “Dial.”
Once connected, the person called will be heard through the audio speakers.
Using the “Re‐dial” Command 1. Press and hold b / g for
two seconds.
2. After the tone, say “Re‐dial.” Once connected, the person called will be heard through the audio speakers.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (53,1)
Three‐Way Calling Three‐way calling must be supported on the cell phone and enabled by the wireless service carrier. 1. While on a call, press b / g. 2. Say “Three‐way call.” 3. Use the dial or call command to dial the number of the third party to be called.
4. Once the call is connected, press b / g to link all callers together.
Ending a Call Press c / x to end a call.
Infotainment System 7-53
Muting a Call During a call, all sounds from inside the vehicle can be muted so that the person on the other end of the call cannot hear them.
To mute a call, press b / g , and then say “Mute call.” To cancel mute, press b / g , and then say “Un‐mute call.”
Transferring a Call Audio can be transferred between the Bluetooth system and the cell phone. The cell phone must be paired and connected with the Bluetooth system before a call can be transferred. The connection process can take up to two minutes after the ignition is turned to ON/RUN.
Receiving a Call When an incoming call is received, the audio system mutes and a ring tone is heard in the vehicle. . Press b / g to answer the call. . Press c / x to ignore a call. Call Waiting Call waiting must be supported on the cell phone and enabled by the wireless service carrier. . Press b / g to answer an
incoming call when another call is active. The original call is placed on hold.
. Press b / g again to return to
the original call. To ignore the incoming call, no action is required.
. Press c / x to disconnect the current call and switch to the call on hold.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (54,1)
7-54
Infotainment System
Transferring Audio from the Bluetooth System to a Cell Phone During a call with the audio in the vehicle: 1. Press b / g. 2. Say “Transfer Call.”
Transferring Audio to the Bluetooth System from a Cell Phone During a call with the audio on the cell phone, press b / g. The audio transfers to the vehicle. If the audio does not transfer to the vehicle, use the audio transfer feature on the cell phone. See your cell phone manufacturer's user guide for more information. Voice Pass-Thru Voice pass‐thru allows access to the voice recognition commands on the cell phone. See your cell phone manufacturer's user guide to see if the cell phone supports this feature.
To access contacts stored in the cell phone: 1. Press and hold b / g for
two seconds.
2. Say “Bluetooth.” This command
can be skipped.
3. Say “Voice.” The system
responds “OK, accessing
The cell phone's normal prompt messages will go through their cycle according to the phone's operating instructions. Dual Tone Multi-Frequency (DTMF) Tones The Bluetooth system can send numbers and the numbers stored as name tags during a call. You can use this feature when calling a menu‐driven phone system. Account numbers can also be stored for use.
Sending a Number or Name Tag During a Call 1. Press b / g. The system
responds “Ready,” followed by a tone.
2. Say “Dial.” 3. Say the number or name tag
to send.
Clearing the System Unless information is deleted out of the in‐vehicle Bluetooth system, it will be retained indefinitely. This includes all saved name tags in the phone book and phone pairing information. For information on how to delete this information, see the previous section “Deleting a Paired Phone” and the previous sections on deleting name tags.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (55,1)
Infotainment System 7-55
Manufactured under license from Dolby Laboratories. Dolby and the double-D symbol are trademarks of Dolby Laboratories.
Other Information The Bluetooth® word mark and logos are owned by the Bluetooth® SIG, Inc. and any use of such marks by General Motors is under license. Other trademarks and trade names are those of their respective owners. See Radio Frequency Statement on page 13‑20 for information regarding Part 15 of the Federal Communications Commission (FCC) rules and Industry Canada Standards RSS-GEN/210/220/310.
Trademarks and License Agreements
Manufactured under license under U.S. Patent #'s: 5,451,942; 5,956,674; 5,974,380; 5,978,762; 6,487,535 & other U.S. and worldwide patents issued & pending. DTS and the Symbol are registered trademarks and DTS Digital Surround and the DTS logos are trademarks of DTS Inc. All Rights Reserved.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (56,1)
7-56
Infotainment System
2 NOTES
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (1,1)
Climate Controls
Climate Control Systems
Climate Control Systems (with
Air Conditioning) . . . . . . . . . . . . . 8-1
Climate Control Systems (with
Heater Only) . . . . . . . . . . . . . . . . . 8-4
Dual Automatic Climate Control
System . . . . . . . . . . . . . . . . . . . . . . 8-5
Air Vents
Air Vents . . . . . . . . . . . . . . . . . . . . . 8-10
Climate Controls
8-1
Climate Control Systems Climate Control Systems (with Air Conditioning)
With this system the heating, cooling, and ventilation can be controlled.
A. Fan Control B. Temperature Control C. Air Delivery Mode Control D. Air Conditioning E. Outside Air F. Recirculation G. Rear Window Defogger
Temperature Control: Turn clockwise or counterclockwise to increase or decrease the temperature inside the vehicle. 9 (Fan Control): Turn clockwise or counterclockwise to increase or decrease the fan speed. Turn the knob all the way counterclockwise to turn the front system off.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (2,1)
8-2
Climate Controls
Air Delivery Mode Control: Turn clockwise or counterclockwise to change the direction of the airflow inside the vehicle. The knob can be positioned between two modes to select a combination of those modes. Select from the following: H (Vent): Air is directed to the instrument panel outlets. ) (Bi-Level): Air is divided between the instrument panel and floor outlets. 6 (Floor): Air is directed to the floor outlets, with some air directed to the windshield and side window outlets. In this mode, the system automatically selects outside air. Recirculation cannot be selected in floor mode. - (Defog): This mode clears the windows of fog or moisture. Air is directed to the windshield, floor outlets, and side window vents.
0 (Defrost): This mode removes fog or frost from the windshield more quickly. Air is directed to the windshield and the side window vents, with some air directed to the floor vents. The system automatically forces outside air into the vehicle. The recirculation mode cannot be selected in the defog or defrost mode. When either mode is selected, the system runs the air conditioning compressor, unless the outside temperature is close to freezing. Do not drive the vehicle until all the windows are clear. : (Outside Air): Press to turn the outside air mode on. An indicator light comes on to show that outside air is on. In this mode outside air circulates throughout the vehicle. The outside air mode can be used with all modes, but it cannot be used with the recirculation mode.
? (Recirculation): Press to turn the recirculation mode on. An indicator light comes on to show that recirculation is on. This mode recirculates and helps to quickly cool the air inside the vehicle. It can be used to help prevent outside air and odors from entering the vehicle. The recirculation mode cannot be used with floor, defog or defrost modes. If recirculation is selected with one of these modes, the indicator light flashes three times and then turns off. While in recirculation mode the windows may fog when the weather is cold and damp. To clear the fog, select either the defog or defrost mode and increase the fan speed. The recirculation mode can be turned off by pressing the outside air button, or by turning off the ignition.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (3,1)
Climate Controls
8-3
Notice: Do not use anything sharp on the inside of the rear window. If you do, you could cut or damage the warming grid, and the repairs would not be covered by the vehicle warranty. Do not attach a temporary vehicle license, tape, a decal, or anything similar to the defogger grid.
# (Air Conditioning): Press to turn the air conditioning system on or off. An indicator light comes on to show that the air conditioning is on. The air conditioning can be selected in any mode as long as the fan switch is on. The air conditioning system removes moisture from the air, so a small amount of water might drip under the vehicle while idling or after turning off the engine. This is normal.
Rear Window Defogger For vehicles with a rear window defogger, a warming grid is used to remove fog from the rear window. 1 (Rear): Press to turn the rear window defogger on or off. An indicator light on the button comes on to show that the rear window defogger is on. The rear window defogger only works when the ignition is in ON/ RUN. The rear window defogger stays on for approximately 10 minutes after the button is pressed, unless the ignition is turned to ACC/ACCESSORY or LOCK/OFF. The defogger can also be turned off by turning off the engine.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (4,1)
8-4
Climate Controls
Climate Control Systems (with Heater Only)
With this system the heating and ventilation can be controlled.
A. Fan Control B. Temperature Control C. Air Delivery Mode Control Temperature Control: Turn clockwise or counterclockwise to increase or decrease the temperature inside the vehicle.
9 (Fan Control): Turn clockwise or counterclockwise to increase or decrease the fan speed. Turn the knob all the way counterclockwise to turn the front system off. Air Delivery Mode Control: Turn clockwise or counterclockwise to increase or decrease the temperature inside the vehicle.
The knob can be positioned between two modes to select a combination of those modes. Select from the following: H (Vent): Air is directed to the instrument panel outlets. ) (Bi-Level): Air is divided between the instrument panel and floor outlets. 6 (Floor): Air is directed to the floor outlets, with some air directed to the windshield, side window, and second row floor outlets. In this mode, the system automatically selects outside air. - (Defog): This mode clears the windows of fog or moisture. Air is directed to the windshield, floor outlets, and side window vents.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (5,1)
Climate Controls
8-5
Dual Automatic Climate Control System
The heating, cooling, and ventilation in the vehicle can be controlled with this system. The vehicle also has a flow-through ventilation system described later in this section.
0 (Defrost): This mode removes fog or frost from the windshield more quickly. Air is directed to the windshield and the side window vents, with some air directed to the floor vents. The system automatically forces outside air into the vehicle. Do not drive the vehicle until all the windows are clear.
A. Driver and Passenger Temperature Controls
B. Fan Control C. AUTO D. Defrost E. Recirculation F. Outside Air
G. Air Delivery Mode Control H. Display I. On/Off J. Rear Window Defogger K. Air Conditioning L. PASS (Passenger)
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (6,1)
8-6
Climate Controls
O (On/Off): Press to turn the climate control system on or off. Outside air still enters the vehicle, and is directed to the floor. This direction can be changed by pressing the mode button. Recirculation can be selected once you have selected vent or bi-level mode. The temperature can also be adjusted using either temperature button. If the air delivery mode or temperature settings are adjusted with the system off, the display illuminates briefly to show the settings and then returns to off. The system can be turned back on by pressing either O, D, C, # , the defrost or the AUTO button. Driver and Passenger Side Temperature Controls The driver and passenger side temperature buttons are used to adjust the temperature of the air coming through the system on the driver or passenger side of the vehicle. The temperature can be adjusted even if the system is
turned off. This is possible since outside air always flows through the system as the vehicle is moving forward unless it is set to recirculation mode. See “Recirculation” later in this section. Press the + or − buttons to increase or decrease the cabin temperature. The driver side or passenger side temperature display shows the temperature setting increasing or decreasing. The passenger temperature setting can be set to match the driver temperature setting by pressing the PASS button and turning off the PASS indicator. When the passenger temperature setting is set different than the driver setting, the indicator on the PASS button illuminates and both the driver side and passenger side temperature displays are shown. When in defrost mode the passenger temperature setting cannot be changed.
Automatic Operation AUTO (Automatic): When automatic operation is active, the system controls the inside temperature, the air delivery, and the fan speed. Use the steps below to place the entire system in automatic mode: 1. Press the AUTO button.
When AUTO is selected, the display changes to show the current temperature(s) and AUTO is lit on the display. The current air delivery mode and fan speed are also displayed for about five seconds. When AUTO is selected, the air conditioning operation and air inlet are automatically controlled. The air conditioning compressor may run when the outside temperature is above freezing. The air inlet will normally be set to outside air. If it is hot outside, the air inlet may automatically switch to the recirculate mode to
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (7,1)
help quickly cool down the air inside the vehicle. The light on the button comes on in recirculation.
2. Set the driver and passenger
temperature. To find your comfort setting, start with a 23°C (74°F) temperature setting and allow about 20 minutes for the system to regulate. Use the driver or passenger temperature buttons to adjust the temperature setting as necessary. If a temperature setting of 15°C (60°F) is chosen, the system remains at the maximum cooling setting. If a temperature setting of 32°C (90°F) is chosen, the system remains at the maximum heat setting. Choosing either maximum setting will not cause the vehicle to heat or cool any faster.
Do not cover the solar sensor located on the top of the instrument panel near the windshield. This
sensor regulates air temperature based on sun load. For more information on the solar sensor, see “Sensors” later in this section. To avoid blowing cold air in cold weather, the system delays turning the fan on until warm air is available. The length of delay depends on the engine coolant temperature. Pressing the fan switch overrides this delay and changes the fan to a selected speed. Manual Operation D C (Fan Control): Press these buttons to increase or decrease the fan speed. Pressing either fan button while in automatic control places the fan under manual control. The fan setting remains displayed and the AUTO light turns off. The air delivery mode remains under automatic control.
Climate Controls
8-7
H G (Air Delivery Mode Control): Press these buttons to change the direction of the airflow in the vehicle. Repeatedly press either button until the desired mode appears on the display. Pressing either mode button while the system is off changes the air delivery mode without turning the system on. Pressing either mode button while in automatic control places the mode under manual control. The air delivery mode setting displays and the AUTO light turns off. The fan remains under automatic control. H (Vent): Air is directed to the instrument panel outlets. ) (Bi-Level): Air is divided between the instrument panel and floor outlets. Some air is directed toward the windshield and side window outlets.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (8,1)
8-8
Climate Controls
6 (Floor): Air is directed to the floor outlets, with some to the windshield, side window outlets, and second row floor outlets. In this mode, the system automatically selects outside air. - (Defog): This mode clears the windows of fog or moisture. Air is directed to the windshield, floor outlets, and side window vents. In this mode, the system turns off recirculation and runs the air conditioning compressor unless the outside temperature is close to freezing. The recirculation mode cannot be selected while in the defrost mode. 0 (Defrost): This mode removes fog or frost from the windshield more quickly. Air is directed to the windshield and side window vents, with some directed to the floor vents. In this mode, the system automatically forces outside air into the vehicle and runs the air conditioning compressor unless the outside temperature is close to
freezing. The recirculation mode cannot be selected while in the defrost mode. The passenger temperature control cannot be activated while in defrost mode. If the PASS button is pressed, the button indicator flashes three times and will not work. If the passenger temperature buttons are adjusted, the driver temperature indicator changes. The passenger temperature will not be displayed. If vent, bi-level, or floor mode is selected again, the climate control system displays the previous temperature settings. Do not drive the vehicle until all windows are clear. # (Air Conditioning): Press to turn the air conditioning (A/C) compressor on and off. An indicator light comes on to show that the air conditioning is on. If this button is pressed when the air conditioning compressor is unavailable due to outside
conditions, the indicator flashes three times and then turns off. If the air conditioning is on and the outside temperature drops below a temperature which is too cool for air conditioning to be effective, the air conditioning light turns off to show that the air conditioning mode has been canceled. On hot days, open the windows long enough to let hot inside air escape. This helps to reduce the time it takes for the vehicle to cool down. It also helps the system to operate more efficiently. The air conditioning system removes moisture from the air, so a small amount of water might drip under the vehicle while idling or after turning off the engine. This is normal. @ (Recirculation): Press to turn the recirculation mode on. An indicator light comes on to show that recirculation is on.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (9,1)
This mode recirculates and helps to quickly cool the air inside the vehicle. It can be used to help prevent outside air and odors from entering the vehicle. The recirculation mode cannot be used with floor, defog, or defrost modes. If recirculation is selected with one of those modes, the indicator light flashes three times and then turns off. The air conditioning compressor also comes on when this mode is activated. While in recirculation mode, the windows may fog when the weather is cold and damp. To clear the fog, select either the defog or defrost mode and increase the fan speed. The recirculation mode can be turned off by pressing the outside air button, or by turning off the ignition. ; (Outside Air): Press to turn the outside air mode on. An indicator light on the button comes on to show that outside is on. When selected, air from outside the
vehicle circulates throughout the vehicle. The recirculation mode cannot be used with the outside air mode. Rear Window Defogger The rear window defogger uses a warming grid to remove fog from the rear window. 1 (Rear Window Defogger): For vehicles with this feature, press to turn the defogger on or off. It automatically turns off several minutes after it has been activated. The defogger can also be turned off by turning the engine off. Do not drive the vehicle until all windows are clear. Notice: Do not use a razor blade or sharp object to clear the inside rear window. Do not adhere anything to the defogger grid lines in the rear glass. These actions may damage the rear defogger. Repairs would not be covered by your warranty.
Climate Controls
8-9
Heated Mirror: For vehicles with heated outside rearview mirrors, the mirrors heat to help clear fog or frost from the surface of the mirror when the rear window defog button is pressed. See Power Mirrors on page 2‑15. Sensors
The solar sensor, located in the defrost grille in the middle of the instrument panel, monitors the solar heat. Do not cover the solar sensor or the system will not work properly.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (10,1)
8-10
Climate Controls
The interior temperature sensor, located in the headliner, measures the temperature of the air inside the vehicle.
There is also an exterior temperature sensor located behind the front grille. This sensor reads the outside air temperature and helps maintain the temperature inside the vehicle. Any cover on the front of the vehicle could cause a false reading in the displayed temperature. The climate control system uses the information from these sensors to maintain comfort settings by adjusting the outlet temperature, fan speed, and the air delivery mode. The system may also supply cooler air to the side of the vehicle facing the sun. The recirculation mode will also be used as needed to maintain cool outlet temperatures.
Air Vents Use the air outlets located in the center and on the side of the instrument panel to direct the airflow. Use the thumbwheels near the air outlets to open or close off the airflow.
Operation Tips . Clear away any ice, snow,
or leaves from air inlets at the base of the windshield that could block the flow of air into the vehicle.
. Keep the path under the front seats clear of objects to help circulate the air inside of the vehicle more effectively.
. Use of non‐GM approved hood deflectors can adversely affect the performance of the system. Check with your dealer before adding equipment to the outside of the vehicle.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (1,1)
Driving and Operating
Driving Information
Distracted Driving . . . . . . . . . . . . . 9-2
Defensive Driving . . . . . . . . . . . . . 9-3
Drunk Driving . . . . . . . . . . . . . . . . . 9-3
Control of a Vehicle . . . . . . . . . . . 9-4
Braking . . . . . . . . . . . . . . . . . . . . . . . 9-4
Steering . . . . . . . . . . . . . . . . . . . . . . . 9-4
Off-Road Recovery . . . . . . . . . . . . 9-5
Loss of Control . . . . . . . . . . . . . . . . 9-5
Off-Road Driving . . . . . . . . . . . . . . 9-6
Driving on Wet Roads . . . . . . . . 9-11
Highway Hypnosis . . . . . . . . . . . 9-12
Hill and Mountain Roads . . . . . 9-12
Winter Driving . . . . . . . . . . . . . . . 9-13
If the Vehicle Is Stuck . . . . . . . . 9-15
Vehicle Load Limits . . . . . . . . . . 9-16
Truck-Camper Loading
Information . . . . . . . . . . . . . . . . . 9-23
Starting and Operating
New Vehicle Break-In . . . . . . . . 9-25
Adjustable Throttle and Brake
Pedal . . . . . . . . . . . . . . . . . . . . . . . 9-25
Ignition Positions . . . . . . . . . . . . 9-26
Starting the Engine . . . . . . . . . . 9-27
Fast Idle System . . . . . . . . . . . . . 9-29
Retained Accessory
Power (RAP) . . . . . . . . . . . . . . . 9-29
Engine Coolant Heater . . . . . . . 9-30
Shifting Into Park . . . . . . . . . . . . 9-30
Shifting out of Park . . . . . . . . . . 9-32
Parking over Things
That Burn . . . . . . . . . . . . . . . . . . 9-32
Active Fuel Management® . . . 9-32
Engine Exhaust
Engine Exhaust . . . . . . . . . . . . . . 9-33
Running the Vehicle While
Parked . . . . . . . . . . . . . . . . . . . . . 9-34
Automatic Transmission
Automatic Transmission . . . . . 9-35
Manual Mode . . . . . . . . . . . . . . . . 9-38
Tow/Haul Mode . . . . . . . . . . . . . . 9-39
Drive Systems
Four-Wheel Drive . . . . . . . . . . . . 9-40
Brakes
Antilock Brake
System (ABS) . . . . . . . . . . . . . . 9-53
Parking Brake . . . . . . . . . . . . . . . 9-54
Brake Assist . . . . . . . . . . . . . . . . . 9-54
Hill Start Assist (HSA) . . . . . . . 9-54
Driving and Operating
9-1
Ride Control Systems
StabiliTrak® System . . . . . . . . . 9-55
Locking Rear Axle . . . . . . . . . . . 9-58
Cruise Control
Cruise Control . . . . . . . . . . . . . . . 9-58
Object Detection Systems
Ultrasonic Parking Assist . . . . 9-61
Rear Vision
Camera (RVC) . . . . . . . . . . . . . 9-62
Fuel
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . 9-68
Recommended Fuel . . . . . . . . . 9-68
Gasoline Specifications (U.S.
and Canada Only) . . . . . . . . . . 9-69
California Fuel
Requirements . . . . . . . . . . . . . . 9-69
Fuels in Foreign Countries . . . 9-69
Fuel Additives . . . . . . . . . . . . . . . 9-70
Fuel E85 (85% Ethanol) . . . . . 9-71
Filling the Tank . . . . . . . . . . . . . . 9-72
Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . 9-73
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (2,1)
9-2
Driving and Operating
Towing
General Towing
Information . . . . . . . . . . . . . . . . . 9-74
Driving Characteristics and
Towing Tips . . . . . . . . . . . . . . . . 9-74
Trailer Towing . . . . . . . . . . . . . . . . 9-78
Towing Equipment . . . . . . . . . . . 9-94
Trailer Sway
Control (TSC) . . . . . . . . . . . . . 9-105
Conversions and Add-Ons
Add-On Electrical
Equipment . . . . . . . . . . . . . . . . 9-105
Adding a Snow Plow or
Similar Equipment . . . . . . . . 9-106
Pickup Conversion to
Chassis Cab . . . . . . . . . . . . . . 9-109
Driving Information
Distracted Driving Distraction comes in many forms and can take your focus from the task of driving. Exercise good judgment and do not let other activities divert your attention away from the road. Many local governments have enacted laws regarding driver distraction. Become familiar with the local laws in your area. To avoid distracted driving, always keep your eyes on the road, hands on the wheel, and mind on the drive. . Do not use a phone in
demanding driving situations. Use a hands-free method to place or receive necessary phone calls.
. Watch the road. Do not
read, take notes, or look up information on phones or other electronic devices.
. Designate a front seat
passenger to handle potential distractions.
. Become familiar with vehicle
features before driving, such as programming favorite radio stations and adjusting climate control and seat settings. Program all trip information into any navigation device prior to driving.
. Wait until the vehicle is parked
to retrieve items that have fallen to the floor.
. Stop or park the vehicle to tend
to children.
. Keep pets in an appropriate
carrier or restraint.
. Avoid stressful conversations while driving, whether with a passenger or on a cell phone.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (3,1)
{ WARNING
Taking your eyes off the road too long or too often could cause a crash resulting in injury or death. Focus your attention on driving.
Refer to the infotainment section for more information on using that system, including pairing and using a cell phone. If equipped, refer to the navigation manual for information on that system, including pairing and using a cell phone.
Defensive Driving Defensive driving means “always expect the unexpected.” The first step in driving defensively is to wear the safety belt. See Safety Belts on page 3‑12. . Assume that other road users
(pedestrians, bicyclists, and other drivers) are going to be careless and make mistakes. Anticipate what they might do and be ready.
. Allow enough following distance
between you and the driver in front of you. Focus on the task of driving.
Driving and Operating
9-3
Drunk Driving Death and injury associated with drinking and driving is a global tragedy.
{ WARNING Drinking and then driving is very dangerous. Your reflexes, perceptions, attentiveness, and judgment can be affected by even a small amount of alcohol. You can have a serious — or even fatal — collision if you drive after drinking. Do not drink and drive or ride with a driver who has been drinking. Ride home in a cab; or if you are with a group, designate a driver who will not drink.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (4,1)
9-4
Driving and Operating
Control of a Vehicle Braking, steering, and accelerating are important factors in helping to control a vehicle while driving.
Braking Braking action involves perception time and reaction time. Deciding to push the brake pedal is perception time. Actually doing it is reaction time. Average driver reaction time is about three-quarters of a second. In that time, a vehicle moving at 100 km/h (60 mph) travels 20 m (66 ft), which could be a lot of distance in an emergency. Helpful braking tips to keep in mind include: . Keep enough distance between
you and the vehicle in front of you.
. Avoid needless heavy braking. . Keep pace with traffic.
If the engine ever stops while the vehicle is being driven, brake normally but do not pump the brakes. Doing so could make the pedal harder to push down. If the engine stops, there will be some power brake assist but it will be used when the brake is applied. Once the power assist is used up, it can take longer to stop and the brake pedal will be harder to push.
Steering
Hydraulic Power Steering Your vehicle has hydraulic power steering. It may require maintenance. See Power Steering Fluid Power Steering Fluid on page 10‑25. If power steering assist is lost because the engine stops or the power steering system is not functioning, the vehicle can be steered but may required increased effort. See your dealer if there is a problem.
If the vehicle is a hybrid, see the hybrid supplement for more information. Curve Tips
Take curves at a reasonable speed.
. Reduce speed before entering a
curve.
. Maintain a reasonable steady
speed through the curve
. Wait until the vehicle is out of the curve before accelerating gently into the straightaway.
Steering in Emergencies
There are some situations when steering around a problem may be more effective than braking.
. Holding both sides of the
steering wheel allows you to turn 180 degrees without removing a hand.
. Antilock Brake System (ABS) allows steering while braking.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (5,1)
Off-Road Recovery
The vehicle's right wheels can drop off the edge of a road onto the shoulder while driving. Follow these tips: 1. Ease off the accelerator and then, if there is nothing in the way, steer the vehicle so that it straddles the edge of the pavement.
2. Turn the steering wheel about one-eighth of a turn, until the right front tire contacts the pavement edge.
3. Then turn the steering wheel to go straight down the roadway.
Loss of Control
Skidding There are three types of skids that correspond to the vehicle's three control systems: . Braking Skid — wheels are not
rolling.
. Steering or Cornering
Skid — too much speed or steering in a curve causes tires to slip and lose cornering force. . Acceleration Skid — too much
throttle causes the driving wheels to spin.
Driving and Operating
9-5
Defensive drivers avoid most skids by taking reasonable care suited to existing conditions, and by not overdriving those conditions. But skids are always possible. If the vehicle starts to slide, follow these suggestions: . Ease your foot off the
accelerator pedal and quickly steer the way you want the vehicle to go. The vehicle may straighten out. Be ready for a second skid if it occurs.
. Slow down and adjust your driving according to weather conditions. Stopping distance can be longer and vehicle control can be affected when traction is reduced by water, snow, ice, gravel, or other material on the road. Learn to recognize warning clues — such as enough water, ice, or packed snow on the road to make a mirrored surface — and slow down when you have any doubt.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (6,1)
9-6
Driving and Operating
Try to avoid sudden steering, acceleration, or braking, including reducing vehicle speed by shifting to a lower gear. Any sudden changes could cause the tires to slide.
Remember: Antilock brakes help avoid only the braking skid.
Off-Road Driving Four-wheel-drive vehicles can be used for off-road driving. Vehicles without four-wheel drive and vehicles not equipped with All Terrain (AT) or On-Off Road (OOR) tires must not be driven off-road except on a level, solid surface. To contact the tire manufacturer for more information about the original equipment tires, see the Limited Warranty and Owner Assistance Information manual. Controlling the vehicle is the key to successful off-road driving. One of the best ways to control the vehicle is to control the speed.
{ WARNING
When driving off-road, bouncing and quick changes in direction can easily throw you out of position. This could cause you to lose control and crash. You and your passengers should always wear safety belts.
Before Driving Off-Road . Have all necessary maintenance
and service work completed. Fuel the vehicle, fill fluid levels, and check inflation pressure in all tires, including the spare, if equipped.
. Read all the information about
four-wheel-drive vehicles in this manual.
. Make sure all underbody
shields, if equipped, are properly attached.
. Know the local laws that apply to
off-road driving.
To gain more ground clearance if needed, it may be necessary to remove the front fascia lower air dam. Notice: Operating the vehicle for extended periods without the front fascia lower air dam installed can cause improper air flow to the engine. Re‐attach the front fascia air dam after off-road driving. Loading the Vehicle for Off-Road Driving
{ WARNING
. Unsecured cargo on the load floor can be tossed about when driving over rough terrain. You or your passengers can be struck by flying objects. Secure the cargo properly.
(Continued)
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (7,1)
Driving and Operating
9-7
WARNING (Continued)
. Keep cargo in the cargo area as far forward and as low as possible. The heaviest things should be on the floor, forward of the rear axle.
. Heavy loads on the roof raise the vehicle's center of gravity, making it more likely to roll over. You can be seriously or fatally injured if the vehicle rolls over. Put heavy loads inside the cargo area, not on the roof.
For more information about loading the vehicle, see Vehicle Load Limits and Tires. Environmental Concerns . Always use established trails,
roads, and areas that have been set aside for public off-road recreational driving and obey all posted regulations.
. Do not damage shrubs, flowers,
trees, or grasses or disturb wildlife.
. Do not park over things that
burn. See Parking Over Things that Burn..
Driving on Hills Driving safely on hills requires good judgment and an understanding of what the vehicle can and cannot do.
{ WARNING
If the vehicle has the two‐speed automatic transfer case, shifting the transfer case to N (Neutral) can cause your vehicle to roll even if the transmission is in P (Park) for an automatic transmission or any gear position for a manual transmission. This is because the N (Neutral) position on the transfer case overrides the transmission. You or someone else could be injured. If leaving
(Continued)
WARNING (Continued)
the vehicle, set the parking brake and shift the transmission to P (Park) for an automatic transmission or any gear position for a manual transmission. Shift the transfer case to any position but N (Neutral).
Before driving on a hill, assess the steepness, traction, and obstructions. If the terrain ahead cannot be seen, get out of the vehicle and walk the hill before driving further. When driving on hills: . Use a low gear and keep a firm
grip on the steering wheel.
. Maintain a slow speed. . When possible, drive straight up
or down the hill.
. Slow down when approaching
the top of the hill.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (8,1)
9-8
Driving and Operating
. Use headlamps even during the
day to make the vehicle more visible.
{ WARNING
Driving to the top of a hill at high speed can cause an accident. There could be a drop-off, embankment, cliff, or even another vehicle. You could be seriously injured or killed. As you near the top of a hill, slow down and stay alert.
. Never go downhill forward or backward with either the transmission or transfer case in N (Neutral). The brakes could overheat and you could lose control.
{ WARNING
{ WARNING
If the vehicle has the two‐speed automatic transfer case, shifting the transfer case to N (Neutral) can cause your vehicle to roll even if the transmission is in P (Park). This is because the N (Neutral) position on the transfer case overrides the transmission. You or someone else could be injured. If leaving the vehicle, set the parking brake and shift the transmission to P (Park). Shift the transfer case to any position but N (Neutral).
. When driving down a hill, keep
the vehicle headed straight down. Use a low gear because the engine will work with the brakes to slow the vehicle and help keep the vehicle under control.
Heavy braking when going down a hill can cause your brakes to overheat and fade. This could cause loss of control and you or others could be injured or killed. Apply the brakes lightly when descending a hill and use a low gear to keep vehicle speed under control.
If the vehicle stalls on a hill: 1. Apply the brakes to stop the vehicle, and then apply the parking brake.
2. Shift into P (Park) for an automatic transmission or 1 (First) for a manual transmission and then restart the engine.
If driving uphill when the vehicle stalls, shift to R (Reverse), release the parking brake, and back straight down.
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Black plate (9,1)
Never try to turn the vehicle around. If the hill is steep enough to stall the vehicle, it is steep enough to cause it to roll over. If you cannot make it up the hill, back straight down the hill. Never back down a hill in N (Neutral) using only the brake.