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 vehicle is equipped with the Tire Pressure Monitoring System.
If a diagnostics check is needed between e-mails, push 
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Advisor can run a check.
See also:
Lock Sensor
When all doors are closed and the ignition is off, the vehicle can be locked
by pressing this area on the door handle. This feature will be available for
several minutes after the vehicle has be ...
If the System Needs Service
If the navigation system needs service and the steps listed here have been followed
but there are still problems, see your dealer for assistance. ...
Rear Seat Entertainment (RSE) System
The vehicle may have a DVD Rear Seat Entertainment (RSE) system.
The RSE system works with the vehicle's infotainment system.
The DVD player is part of the front radio. The RSE system includes a ...