TrailBlazer 4WD L6-4.2L VIN S (2002)
Speaker: All Technical Service Bulletins
Radio Speakers - Intermittent, Random Noises
File In Section: 08 - Body and Accessories
Bulletin No.: 01-08-44-013
Date: October, 2001
TECHNICAL
Subject:
Noise Heard in Radio Speakers
(Replace Amplifier or Repair Wiring Harness)
Models:
2002 Chevrolet and GMC S/T Utility Models
(TrailBlazer, Envoy)
2002 Oldsmobile Bravada
with Premium Sound (RPO UQA)
This bulletin provides information on two different conditions.
Condition 1
Some customers may comment about intermittent static, popping, thumping or booming noises randomly heard in any or all speakers. This condition
generally occurs in warmer climate areas.
Cause
Overheating of the radio amplifier due to ambient and operational temperatures may cause this condition.
Correction
An improved radio amplifier is now available from GMSPO. Replace the radio amplifier. Refer to the Entertainment sub-section of the Service Manual
for the Amplifier Replacement procedure (SI2000 Document ID # 717628).
Condition 2
Some customers may comment about consistent static, popping, thumping or booming noises heard in the same speaker repeatedly.
Cause
This condition may be caused by the radio amplifier wiring harness being pinched by the passenger side rear seat attachments, resulting in damage to the
wires.
Correction
Repair any damaged wires using the procedure listed below.
1.
Remove the right rear seat back. Refer to the Seats sub-section of the Service Manual for the Seat Back Replacement procedure (SI2000
Document ID # 741140).
2.
Remove the right rear door sill plate.
3.
Pull back the carpet in order to access radio amplifier harness.
