Audio System - No Audio From Speakers At Times

File In Section: 08 - Body and Accessories

Bulletin No.: 02-08-44-020B

Date: March, 2003

TECHNICAL

Subject:
No Audio Out of Speakers At Times
(Reprogram Radio and/or Replace Amplifier)

Models:
2003 Cadillac Escalade, Escalade EXT
2003 Chevrolet Avalanche, Express, Silverado, Suburban, Tahoe
2003 GMC Savana, Sierra, Sierra Denali, Yukon, Yukon Denali, Yukon XL,
Yukon Denali XL
2003 HUMMER H2

This bulletin is being revised to clarify the models and the approved repair procedure.

Please discard Corporate Bulletin Number 02-08-44-020A (Section 08 - Body and Accessories).

Condition

Some customers may comment that at times there is no audio out of any speakers. However, on the next key cycle the audio system may perform properly.

Cause

An anomaly within the amplifier/radio operating systems may cause this condition.

Correction

Important:
Pay particular attention to this correction procedure, it is somewhat complicated. The repair varies based on the vehicle sound system. Refer to the Service Parts Identification (SPID) Label of the vehicle being repaired. The type of sound system in the vehicle will determine the repair procedure.

1. Determine the regular production option (RPO) code of the sound system in the vehicle from the SPID label.

2. Install the Tech 2(R) to the vehicle DLC and determine the part number of the radio software and the amplifier part number.











3. Refer to the tables to determine the correct repair(s).

Notice:
BEFORE DISCONNECTING ANY AUDIO SYSTEM COMPONENT IN A VEHICLE WITH THE BOSE(R) AUDIO SYSTEM, THE 30 AMP AMPLIFIER FUSE MUST BE REMOVED FROM THE ENGINE WIRING HARNESS JUNCTION BLOCK. Failure to remove the 30 AMP fuse from the UBEC can result in a damaged Bose(R) amplifier.

Important:
DETERMINE THE SOFTWARE NUMBER OF THE RADIO AND THE AMPLIFIER. THE RADIO MAY NEED REPROGRAMMING, OR THE AMPLIFIER MAY NEED REPLACEMENT ONLY. NOT ALL VEHICLES WILL NEED BOTH A RADIO REPROGRAMMING AND AMPLIFIER REPLACEMENT.

Notice:
BEFORE DISCONNECTING ANY AUDIO SYSTEM COMPONENT IN A VEHICLE WITH THE BOSE(R) AUDIO SYSTEM, THE 30 AMP AMPLIFIER FUSE MUST BE REMOVED FROM THE ENGINE WIRING HARNESS JUNCTION BLOCK. Failure to remove the 30 AMP fuse from the UBEC can result in a damaged Bose(R) amplifier.

Important:
DETERMINE THE SOFTWARE NUMBER OF THE RADIO AND THE AMPLIFIER. THE RADIO MAY NEED REPROGRAMMING, OR THE AMPLIFIER MAY NEED REPLACEMENT ONLY. NOT ALL VEHICLES WILL NEED BOTH A RADIO REPROGRAMMING AND AMPLIFIER REPLACEMENT.





Parts Information

Reprogramming Software

The software necessary to reprogram the radio was released on TIS version 1.5, of January 2003.

Warranty Information





For vehicles repaired under warranty, use the table.





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