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:
Overview (Radio with CD/DVD and MEM)
A. VOL/ - Turns the system on or off and adjusts
the volume.
B. Buttons 1 to 6 - Radio: Saves and selects favorite stations.
- MEM: Saves and selects favorite tracks and playlists.
C. TU ...
Cleaning Exterior Lamps/ Lenses and Emblems
Use only lukewarm or cold water, a soft cloth, and a car washing soap to clean
exterior lamps and lenses. Follow instructions under "Washing the Vehicle" later
in this section. ...
Rear Seat Pass-Through Door
Some vehicles have a rear seat pass-through door in the center of the rear
seatback. Fold down the center armrest and push down on the latch to open the
door. ...