Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Noise compensated volume only available on vehicles equipped with Y91.
- Turn the ignition ON. Disconnect the noise compensation microphone.
- Measure for 7-9 volts between the noise compensation microphone supply circuit and the drain circuit.
- If the voltage is in between 7-9 volts, replace the noise compensation microphone.
- If the voltage is greater than 9 volts or less than 7 volts and a open, short to ground, or short to voltage can not be found, replace the radio.