Noise Compensated Volume Inoperative
Noise Compensated Volume Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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 Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
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 signal circuit terminal B and ground.
• If less than the specified range, test the signal 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 signal 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 signal 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