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:
2005 Cadillac XLR Review
Cadillac's version of the Corvette, now in its second year of production,
continues to be one of my favorites. Called the XLR, this new Caddy is the first
true sports car from General Motors' luxu ...
How to Reset the Engine Oil Life System
Reset the system whenever the engine oil is changed so that the system can
calculate the next engine oil change. To reset the system:
1. Using the DIC MENU button and thumbwheel on the turn signal ...
Heated Steering Wheel
For vehicles with a heated steering wheel, the button for this feature is
located on the steering wheel.
(Heated Steering Wheel): Press to turn the heated steering wheel on or
off. A light on ...