See also:

DIC Operation and Displays
The DIC has different displays which can be accessed by using the DIC buttons on the turn signal lever located on the left side of the steering wheel. The DIC displays trip, fuel, vehicle system inf ...

Twilight Sentinel
This feature automatically turns the lamps on and off. A light sensor on top of the instrument panel makes the Twilight Sentinel® work, so be sure it is not covered. With Twilight Sentinel th ...

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 ...