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:
Security Light
The security light should come on briefly as the engine is started. If the system
is working normally, the indicator light turns off. If it does not come on, have
the vehicle serviced by your de ...
Chime Volume
This allows the selection of the chime volume level.
Press the MENU/SELECT knob when Chime Volume is highlighted.
Turn the knob to select Normal or High. Press the knob to confirm and go
back t ...
Armrest Storage
For vehicles with a rear seat armrest, pull the rear seat armrest forward to
access cupholders with removable liners. For vehicles with a rear storage area,
pull the lever to access. ...