See also:

Unlock Feedback (Lights)
When on, the exterior lamps will flash when unlocking the vehicle with the RKE transmitter. Press SELECT when Unlock Feedback (Lights) is highlighted. Turn the Menu knob to select On or Off. ...

Special Application Services
Severe Commercial Use Vehicles Only: Lubricate chassis components every 5 000 km/3,000 mi. Have underbody flushing service performed once a year. ...

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 ...