See also:

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 ...

Safety System Check
Now and then, check that the safety belt reminder light, safety belts, buckles, latch plates, retractors, and anchorages are all working properly. Look for any other loose or damaged safety b ...

Starting the Engine
Place the transmission in the proper gear. If the vehicle has the keyless access system, the keyless access transmitter must be authenticated in order for the ignition control knob to turn. ...