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:
Treadwear
The treadwear grade is a comparative rating based on the wear rate of the tire
when tested under controlled conditions on a specified government test course. For
example, a tire graded 150 would w ...
Cargo Cover (Wagon)
The cargo cover can be used to
cover items in the cargo area.
To install the cargo cover:
1. Hold the cartridge with the
pull-out shade toward the rear
of the vehicle.
2. Align the cartridg ...
Playing an MP3/WMA Disc
CD players with the MP3 feature are
capable of playing an MP3/WMA
CD-R or CD-RW disc. See MP3 for more information. ...