See also:

Passive Door Lock
If the vehicle has the Remote Keyless Entry (RKE) system, when enabled, this feature allows the doors to lock after several seconds if all doors are closed and at least one RKE transmitter has been ...

Delayed Door Lock
When on, this feature will delay the locking of the doors until five seconds after the last door is closed. You will hear three chimes to signal delayed locking is in use. Pressing either the pow ...

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 ...