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:
Arming the System
To arm the system:
1. Open the door.
2. Lock the door with the
transmitter. The security light
should come on and stay on.
3. Close all doors. The security
light should go off after about
3 ...
How to Check Lubricant
To get an accurate reading, the vehicle should be on a level surface.
A. Fill Plug
B. Drain Plug
When the differential is cold, add enough lubricant to raise the level
from 0mm (0 in) to 3. ...
Portable Audio Devices
This vehicle has an auxiliary input, located on the audio faceplate, and a USB
port located on the instrument panel or in the center console. External devices
such as iPod®, laptop computers, MP3 ...