See also:

How the System Works
URPA comes on automatically when the shift lever is moved into R (Reverse). A single tone sounds to indicate the system is working. URPA operates only at speeds less than 8 km/h (5 mph). An obstacle ...

Navigating an iPod or USB Device on the Main Audio Screen (Vehicles with a Navigation System)
1. Press and release or to select the next or previous track within the selected category. 2. Press and hold or to move quickly through the tracks. 3. Press and release to move up one track w ...

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 vehic ...