See also:

Horn
Pressa on the steering wheel pad to sound the horn. ...

Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not operate if ...

Adding and Removing Categories
Categories cannot be added or removed while the vehicle is moving faster than 8 km/h (5 mph). To add or remove a category: 1. Press the MENU button. 2. Press the softkey located below the XM CAT ta ...