See also:

General Information
For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people. Genuine GM parts have one of these marks: ...

Taillamps (Chassis Cab Models)
A. Backup Lamp B. Stoplamp/Taillamp/Turn Signal Lamp To replace one of these bulbs: 1. Remove the four screws. 2. Lift the lens off the lamp assembly. 3. Turn the old bulb counterclockwise and ...

Cellular and GPS Antennas
Avoid placing items over or near the antenna to prevent blocking cellular and GPS signal reception. Cellular reception is required for OnStar to send remote signals to the vehicle. ...