Buzz Type Noise Coming From Rear Speakers (Relocate Transfer Case Module Ground)

This bulletin is being revised to provide an updated service procedure and new warranty information. Please discard Corporate Bulletin Number 04-08-44-014A (Section 08 -- Body and Accessories).

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.

Important: This procedure will only correct the noise related to transfer case operation. It will not correct the speed sensitive whine type noise, commonly referred to as alternator whine.

Perform the following procedure to reduce the rear speaker buzz noise caused by the active transfer case.

1. Remove the left side IP closeout panel.
2. Remove the transfer case control module and mounting bracket from the IP 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 a 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 IP mag beam.
10. Install the left side IP closeout panel.

The terminals are included in Packard Terminal Repair Kit J 38125-A or available for ordering by calling 1-800-GM-TOOLS.

For vehicles repaired under warranty, use:

*This is a unique labor operation number for use only with this bulletin. This number will not be published in the Labor Time Guide.