K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
Amplifier: All Technical Service Bulletins
Audio System - Whine/Interference Noise From Speakers
File In Section: 08 - Body and Accessories
Bulletin No.: 03-08-44-009
Date: June, 2003
TECHNICAL
Subject:
Radio Noise Heard In One Or More Speakers
(Repair Open Circuit In Amplifier Wiring)
Models:
2003 Cadillac Escalade, Escalade ESV, Escalade EXT
2003 GMC Denali, Denali XL
2003 HUMMER H2
Condition
Some customers may comment on a noise heard through a radio speaker, particularly in dead air or between tracks on a CD. The noise will often be
described as an alternator whine. Others may comment that the noise sounds like radio interference. The noise will be heard mostly through the A pillar
tweeter, but may be heard through other speakers as well.
Cause
This condition may be caused by an open in either circuit of the signal input twisted pair wiring between the radio and the audio amplifier. The circuit
numbers for the left channel amplifier input are 511 and 1947. The circuit numbers for the right channel amplifier input are 512 and 1546. The affected
left or right channel will still produce sound even though one of the circuits for that channel may be open.
Correction
Technicians should inspect for an open in either circuit of the amplifier wiring harness between the radio and the audio amplifier. Repair the circuit as
necessary. If a speaker is completely inoperative, refer to the Speakers Inoperative - One or More diagnostic procedure in SI (Document ID # 813966).
Warranty Information
For vehicles repaired under warranty, use the table.
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