Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that the cellular antenna and cellular antenna coupling assembly are not damaged.
- If damage is found, repair or replace as necessary.
- Ignition ON, press the OnStar® Call Center button. Verify the system activates and the message Connecting to OnStar® is heard.
- If the system does not activate and the message is not heard, refer to OnStar One or More Buttons Inoperative .
- If the system activates but does not connect with the OnStar® call center, refer to Circuit/System testing below.