Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
The global positioning system (GPS) requires a clear line of sight to the sky to operate properly. In most cases the GPS will not have reception near tall buildings or inside structures.
- Remove the GPS antenna and cable and place it outside the vehicle. Verify the GPS reception is operational within 5 minutes.
- If GPS becomes operational, remove any suspect window tint or objects that may obstruct the GPS signal.
- Replace the GPS antenna. Verify the GPS reception is operational within 5 minutes.
- If GPS is not operational, replace the radio.