See also:

Service Only Mode
This power mode is available for service and diagnostics, and to verify the proper operation of the malfunction indicator lamp as may be required for emission inspection purposes. With the vehicle ...

Heated Mirrors
For vehicles with heated mirrors: (Rear Window Defogger): Press to heat the mirrors. See “Rear Window Defogger” under Automatic Climate Control System for more information. ...

Using the Delete All Name Tags Command
The delete all name tags command deletes all stored phone book name tags and route name tags for OnStar (if present). To use the delete all name tags command: 1. Press and hold for two seconds. ...