System difficulties

NOTICE Use of an incorrect program will impair the vehicle's response to the terrain and can reduce the life of the suspension and drive systems. If the system becomes partially inoperabl ...

Selecting HDC

1. Press to switch HDC on and off. 2. Press to increase the set speed. 3. Press to decrease the set speed. HDC can be selected at speeds below 50 mph (80 km/h). HDC can be used in D, R or Comman ...

See also:

Maps
This section includes basic information that you need to know about the map database. The maps are stored on a compact flash drive that is built into the navigation system. ...

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 v ...

Roadside Service (U.S. and Canada)
U.S.: 1-800-224-1400 Canada: 1-800-882-1112. Text Telephone (TTY) Users (U.S. Only): 1-888-889-2438. Service is available 24 hours a day, 365 days a year. ...