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:
XM™ Satellite Radio Service
XM Satellite Radio Service gives
digital radio reception from coast to
coast in the 48 contiguous United
States, and in Canada. Just as with
FM, tall buildings or hills can
interfere with sa ...
Installing the Fence
Insert the fence into the adapters and lock both latches (A) by turning to
align with the arrow on the adapter (B). ...
When to Check
Check the tires once a month or more.
Do not forget the spare tire. See Full-Size Spare Tire for additional
information. ...