Noise Compensated Volume Malfunction

Noise Compensated Volume Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

Circuit Description

The audio amplifier supplies 9 volts to the noise compensation microphone. The audio amplifier receives a signal from the noise compensation microphone to determine the amount of interior vehicle noise and adjusts the amplifier output to the speakers accordingly.

Reference Information
Schematic Reference

Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Radio/Audio System Description and Operation (Radio/Audio System)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the noise compensation microphone.
2. Ignition ON, test for 8.5-9.5 volts between the noise compensation microphone supply voltage circuit terminal B and ground.

• If less than the specified range, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the audio amplifier.

• If greater than the specified range, test the voltage supply circuit for a short to voltage. If the circuit tests normal, replace the audio amplifier.

3. Ignition ON, test for 8.5-9.5 volts between the noise compensation microphone supply voltage circuit terminal B and the drain wire circuit terminal A.

• If less than the specified range, test the drain wire circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the audio amplifier.

4. If all circuits test normal, replace the noise compensation microphone.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Radio Volume Compensator Interior Noise Microphone Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for Audio Amplifier replacement, setup, and programming