Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Allow the navigation display to cool if the ambient temperature inside the vehicle is excessive and the radio is hot to the touch. Verify the navigation display is cool and the DTC has cleared and gone to history.
- If the DTC has gone to history and the navigation display backlighting operates normal clear the DTC and go to diagnostic aids.
- Observe the brightness of the navigation display backlighting. Verify the backlighting can be adjusted or the screen is not blank.
- If the display backlighting is malfunctioning or the DTC will not clear, replace the radio.