See also:

Dome Lamp Override
The dome lamp override button is located next to the exterior lamps control. : Press the button in and the dome lamps remain off when a door is opened. Press the button again to return it to 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 v ...

Automatic Door Locks
For vehicles with an automatic transmission, the doors will lock automatically when all doors are closed, the ignition is on, and the shift lever is moved out of P (Park). The doors will auto ...