See also:

Horn
Press near the horn symbols or press on the steering wheel pad to sound the horn. ...

Wheels and Trim—Aluminum or Chrome
Use a soft, clean cloth with mild soap and water to clean the wheels. After rinsing thoroughly with clean water, dry with a soft, clean towel. A wax may then be applied. Keep the wheels clean u ...

Warranty
OnStar equipment may be warranted as part of the new-vehicle limited warranty. The manufacturer of the vehicle furnishes detailed warranty information. ...