Envoy 2WD V8-5.3L VIN P (2004)
Control Module: Customer Interest
Audio System - Buzzing From Rear Speakers
Bulletin No.: 04-08-44-014A
Date: September 03, 2004
ADVANCE SERVICE INFORMATION RESOLUTION
Subject:
Buzz Type Noise Coming From Rear Speakers (Twist/Shield Speaker Wires and Relocate Ground)
Models:
2004 Buick Rainier
2004 Chevrolet TrailBlazer, TrailBlazer EXT
2004 GMC Envoy, Envoy XL, Envoy XUV
2004 Oldsmobile Bravada
with Speaker System Premium Performance Enhanced (Bose(R)) Audio (RPO UQA) and A4WD/AWD
Built After November 1, 2003 (Non Class 2 System)
Supercede:
This bulletin is being revised to provide the correction information, which is now available for Advanced Service Information Bulletin Number
04-08-44-014. Please discard Corporate Bulletin Number 04-08-44-014 (Section 08 - Body and Accessories).
Condition
Some customers may comment on a buzz type noise heard through the rear speakers. This noise can only be heard when the radio is on, volume low and
while driving in A4WD/AWD mode. The noise USUALLY occurs above 32 km/h (20 mph) and is related to the active transfer case operation.
Correction
Perform the following procedure to reduce the rear speaker buzz noise caused by the active transfer case.
1.
Remove the left side I/P closeout panel.
2.
Remove the transfer case control module and mounting bracket from the I/P mag beam.
3.
Disconnect the C3 connector from the transfer case control module.
4.
Remove the wire and terminal from cavity A (circuit 2250) from C3 connector. Tape back.
5.
Construct new ground wire using terminals P/N 12047767 and P/N 12089496. Route this wire through the grommet from the IP out to the engine
compartment.
6.
Install the new ring terminal onto ground stud (G105) located on the bulkhead just above the brake booster.
7.
Install the new terminal into cavity A of connector C3.
8.
Connect the C3 connector to the transfer case control module.
9.
Install the transfer case control module and mounting bracket to the I/P mag beam.
10.
Install the left side I/P closeout panel.
11.
Remove the console floor bracket from the vehicle.
12.
Remove the rear seat audio module from the console.
13.
Remove the console harness from the console.
14.
On the console harness, remove the following circuits from the inline to IP connector (C307) and twist together (minimum of 1 twist per inch) in 4
separate pairs. Mark like color wires with cavity location.
