TSB - Radio Automatic Volume Control Feature Inoperative

[Klaus]

Document ID # 1236781
2003 HUMMER H2

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Radio Automatic Volume Control Feature Inoperative (Rewire Noise Cancellation Microphone) #03-08-44-004 - (02/04/2003)
Radio Automatic Volume Control Feature Inoperative (Rewire Noise Cancellation Microphone)
2003 HUMMER H2

Condition
Some customers may comment that the Automatic Volume Control feature of the radio is not working.

Cause
The wires to the noise cancellation microphone may be installed in the incorrect cavities at the audio amplifier module.

Correction
Install the noise cancellation microphone wires into the correct cavities at the audio amplifier module using the following procedure:

Remove the center console in order to gain access to the audio amplifier module. Refer to the Console Replacement procedure in SI (Document ID #834656).
Disconnect connector 1 (Light Gray, 24 way) from the audio amplifier.
Locate the two wires (circuit 1354, Light Green/Black and circuit 1488, Dark Green) in the connector for the noise cancellation microphone. They are in cavities B1 and B2 of the connector.
Remove the two wires from the connector and reinstall them into the opposite cavity from where they were originally. The Light Green/Black (circuit 1354) wire should now be installed in cavity B1. The Dark Green (circuit 1488) wire should now be installed in cavity B2.
Reconnect connector 1 to the audio amplifier module.
Install the center console. Refer to the Console Replacement procedure in SI (Document ID #834656).
Verify the operation of the noise cancellation microphone and the Automatic Control Feature of the Entertainment System.
If the Automatic Volume Control is still inoperative, refer to the Diagnostic Starting Point-Entertainment (Document ID #684715) for further diagnosis.
Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

N6632
Wiring And/Or Connector-Repair Or Replace-Vehicle Entertainment
ST




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID # 1236781
2003 HUMMER H2

[Klaus]

Document ID # 1236781
2003 HUMMER H2

--------------------------------------------------------------------------------

Radio Automatic Volume Control Feature Inoperative (Rewire Noise Cancellation Microphone) #03-08-44-004 - (02/04/2003)
Radio Automatic Volume Control Feature Inoperative (Rewire Noise Cancellation Microphone)
2003 HUMMER H2

Condition
Some customers may comment that the Automatic Volume Control feature of the radio is not working.

Cause
The wires to the noise cancellation microphone may be installed in the incorrect cavities at the audio amplifier module.

Correction
Install the noise cancellation microphone wires into the correct cavities at the audio amplifier module using the following procedure:

Remove the center console in order to gain access to the audio amplifier module. Refer to the Console Replacement procedure in SI (Document ID #834656).
Disconnect connector 1 (Light Gray, 24 way) from the audio amplifier.
Locate the two wires (circuit 1354, Light Green/Black and circuit 1488, Dark Green) in the connector for the noise cancellation microphone. They are in cavities B1 and B2 of the connector.
Remove the two wires from the connector and reinstall them into the opposite cavity from where they were originally. The Light Green/Black (circuit 1354) wire should now be installed in cavity B1. The Dark Green (circuit 1488) wire should now be installed in cavity B2.
Reconnect connector 1 to the audio amplifier module.
Install the center console. Refer to the Console Replacement procedure in SI (Document ID #834656).
Verify the operation of the noise cancellation microphone and the Automatic Control Feature of the Entertainment System.
If the Automatic Volume Control is still inoperative, refer to the Diagnostic Starting Point-Entertainment (Document ID #684715) for further diagnosis.
Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

N6632
Wiring And/Or Connector-Repair Or Replace-Vehicle Entertainment
ST




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID # 1236781
2003 HUMMER H2