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 Belts
Refer to the following sections for important information on how to use safety belts properly: Safety Belts . How to Wear Safety Belts Properly . Lap-Shoulder Belt . Lower Anchors and Te ...

Door Ajar Light
For vehicles equipped with this light, it comes on when a door is open or not securely latched. Before driving, check that all doors are properly closed. See Door Ajar Messages  for more in ...