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.
- Ignition OFF, key in the ignition, open the driver door. The courtesy lamps should illuminate.
- If the courtesy lamps do not illuminate, refer to Courtesy Lamps Inoperative .
- Ignition ON, radio ON, adjust the radio balance and fade to the left front speaker.
- If the speaker does not operate properly, refer to Speakers Inoperative - One or More .
- If the speaker operates properly, replace the radio.