See also:

Battery Power Protection
The battery saver feature is designed to protect the vehicle's battery. To prevent battery discharge while driving, the following systems are reduced automatically in two stages and then turned off: ...

Door Ajar Messages
DRIVER DOOR OPEN This message will display when the driver door is open. Close the door completely. HOOD OPEN This message will display when the hood is open. Close the hood completely. LEFT REAR ...

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 ...