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.
Note: Noise compensated volume only available on vehicles equipped with Y91.
- Turn the ignition ON, Disconnect the noise compensation microphone.
- Measure for 7 V to 9 V between the noise compensation microphone supply circuit and the drain circuit.
- If the voltage is in between 9 to 7 V, replace the noise compensation microphone
- If the voltage is greater than 9 V or less than 7 V and a open, short to ground, or short to voltage can not be found, replace the radio.