See also:

Automatic Transfer Case
The transfer case knob is located next to the steering column. Use the dial to shift into and out of Four-Wheel Drive. You can choose among five driving settings: Indicator lights in the dial sho ...

Charging System Light
This light comes on briefly when the ignition key is turned to START, but the engine is not running, as a check to show it is working. If it does not, have the vehicle serviced by your dealer. The ...

Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if the vehic ...