TrailBlazer 4WD L6-4.2L VIN S (2002)
Technical Service Bulletin # 02-08-44-016A
Date: 021201
Audio System - Whine/Buzz Noise on Acceleration
File In Section: 08 - Body and Accessories
Bulletin No.: 02-08-44-016A
Date: December, 2002
TECHNICAL
Subject:
Whine, Buzz, Generator Whine, Whine Type Noise Heard on Acceleration (Repair Vehicle Sound System Wiring)
Models:
2002 Chevrolet TrailBlazer
2002 GMC Envoy
2002 Oldsmobile Bravada
Built Prior to December, 2001
This bulletin is being revised to change the model year. Please discard Corporate Bulletin Number 02-08-44-016 (Section 08 - Body and Accessories).
Condition
Some customers may comment on a buzzing or generator whine-type noise that emanates from the vehicle speakers with the radio on or off and when the
headlights are on. This sound may be altered by changing the IP backlighting intensity (Dimming Function). Or, a noise emanates from the All-Wheel
Drive system (if equipped), of 1 to 2 seconds duration during initial acceleration, at 24 km/h (15 mph) or at 48 km/h (30 mph). The generator whine-type
noise may be observed at any time, however it is more noticeable when the electrical load on the system is high.
Cause
The cause of this condition may be EMI interference that is being transmitted to the radio system speakers from within the body wiring harness.
Correction
To determine which parts to order, you will need to inspect the vehicle. There are four types of audio systems available and three specific service wiring
harness assemblies.
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Bose(R) Premium Sound System with Rear Audio Controls
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Bose(R) Premium Sound System without Rear Audio Controls
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Non-Bose(R) Sound System with Rear Audio Controls
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Non-Bose(R) Sound System without Rear Audio Controls
See the Parts Information below for applicable part numbers.
Parts Information
Paris are currently available from GMSPO.
Warranty Information
