Workshop Repair and Service Manuals GMC SIERRA
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User Manual

Accessories and Modifications      Adding non-dealer accessories or making modifications to the vehicle can affect vehicle performance and safety, including such things as airbags, braking, stability, ride and handling, emissions systems, aerodynamics,...
Active Fuel Management®      Vehicles with V8 engines may have Active Fuel Management™. This system allows the engine to operate on either all or half of its cylinders, depending on the driving conditions. When less power is required, such as cruising...
Add-On Electrical Equipment      Notice: Do not add anything electrical to the vehicle unless you check with your dealer first. Some electrical equipment can damage the vehicle and the damage would not be covered by the vehicle's warranty. Some add-on...
Add-on Electrical Equipment      The OnStar system is integrated into the electrical architecture of the vehicle. Do not add any electrical equipment. See Add-On Electrical Equipment on page 9?112. Added electrical equipment may interfere with the operation...
Add-On Equipment      When you carry removable items, you may need to put a limit on how many people you carry inside your vehicle. Be sure to weigh your vehicle before you buy and install the new equipment. Notice: Overloading the vehicle may...
Adding a Snow Plow or Similar Equipment      Before installing a snow plow on the vehicle, here are some things you need to know: Notice: If the vehicle does not have the snow plow prep package, adding a plow can damage the vehicle, and the repairs would not be...
Adding and Removing Categories      Categories cannot be added or removed while the vehicle is moving faster than 8 km/h (5 mph). To add or remove a category: 1. Press the MENU button. 2. Press the softkey located below the XM CAT tab. 3. Turn the...
Adding Equipment to the Airbag-Equipped Vehicle      Q: Is there anything I might add to or change about the vehicle that could keep the airbags from working properly? A: Yes. If you add things that change your vehicle's frame, bumper system, height, front end or side sheet...
Adding Washer Fluid      The vehicle has a low washer fluid message on the DIC that comes on when the washer fluid is low. The message is displayed for 15 seconds at the start of each ignition cycle. When the WASHER FLUID LOW ADD FLUID message...
Additional Factors Affecting System Operation      Safety belts help keep the passenger in position on the seat during vehicle maneuvers and braking, which helps the passenger sensing system maintain the passenger airbag status. See “Safety Belts” and “Child Restraints” in the...
Adjustable Throttle and Brake Pedal      On vehicles with this feature, you can change the position of the throttle and brake pedals. No adjustment to the pedals can be made when the vehicle is in R (Reverse) or while using cruise control. The control used...
Adjusting the Brightness and Contrast of the Screen      To adjust the brightness and contrast of the screen, press the MENU button while the RVC image is on the display. Any adjustments made will only affect the RVC screen. (Brightness): Touch the + (plus) or – (minus) screen...
Adjusting the Speakers (Balance/Fade) (All Except AM-FM Radio and Radio with CD)      BAL/FADE (Balance/Fade): To adjust the balance or fade: 1. Press the knob until the speaker control tabs display. 2. Highlight the desired speaker control tab by doing one of the following: • Press the knob. •...
Adjusting the Speakers (Balance/Fade) (AM-FM Radio and AM-FM Radio with CD)      To adjust the balance or fade: 1. Press or press the knob until the speaker control label displays. 2. To adjust the setting, do one of the following: • Turn the knob. • Press either SEEK, or SEEK. •...
After Off-Road Driving      Remove any brush or debris that has collected on the underbody or chassis, or under the hood. These accumulations can be a fire hazard. After operation in mud or sand, have the brake linings cleaned and checked. These...
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,...
Airbag On-Off Light      If the vehicle has an airbag on-off switch, it also has a passenger airbag status indicator located in the overhead console. United States Canada and Mexico When the vehicle is started, the passenger...
Airbag On-Off Switch      If one of the switches pictured in the following illustrations is located in the glove box, the vehicle has an airbag on-off switch that you can use to manually turn on or off the right front passenger airbag. United...
Airbag Readiness Light      The system checks the airbag's electrical system for possible malfunctions. If the light stays on it indicates there is an electrical problem. The system check includes the airbag sensor(s), the pretensioners, the airbag...
Airbag System Check      The airbag system does not need regularly scheduled maintenance or replacement. Make sure the airbag readiness light is working. See Airbag Readiness Light on page 5?20 for more information. Notice: If an airbag covering...
Airbag System Messages      SERVICE AIR BAG This message displays if there is a problem with the airbag system. Have your dealer inspect the system for problems. See Airbag Readiness Light on page 5?20 and Airbag System on page 3?23 for more...
AM      The range for most AM stations is greater than for FM, especially at night. The longer range can cause station frequencies to interfere with each other. For better radio reception, most AM radio stations boost the power levels...
AM-FM Radio     
AM-FM Radio and AM-FM Radio with CD Player      To set the clock: 1. Turn the ignition key to ACC/ ACCESSORY or ON/RUN, then press the button to turn the radio on. 2. Press the button until the hour numbers begin to flash, then turn the knob to increase or...