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.
- Turn ON the ignition, with the engine OFF and turn ON the radio. Adjust the fade and balance controls to mid range and Insert the CD from the J 39916-A CD Diagnostic Audio Kit to identify the suspect speaker.
- Replace suspect speaker if distortion is found.
UQA Without Y91
- Turn ON the ignition, with the engine OFF and turn ON the radio. Adjust the fade and balance controls to mid range and Insert the CD from the J 39916-A CD Diagnostic Audio Kit to identify the suspect speaker.
- On vehicles equipped with UQA without Y91, test for a short to B+ or short to ground on the suspected speaker channel circuits between the amplifier and the suspect speaker.
- If all circuits test normal, replace suspect speaker if distortion is found.