SB-16-NA-137

File in Section:
Service Bulletin
-
Bulletin No.:
16-NA-137
Date:
May, 2016
TECHNICAL
Subject:
Mobile Telephone Microphone Poor Performance
This Bulletin replaces PI1040A and PI1162B. Please discard PI1040A and PI1162B.
Engine:
Transmission:
All
All
2015
All
All
2015
2016
All
All
Colorado
2015
2015
All
All
Chevrolet
Silverado
1500
2014
2014
All
All
Chevrolet
Silverado,
Suburban,
Tahoe
2015
2016
All
All
Chevrolet
Traverse
2013
2016
SOP
December
1, 2015
All
All
GMC
Acadia
2013
2016
SOP
December
1, 2015
All
All
GMC
Canyon
2015
2015
All
All
GMC
Sierra 1500
2014
2014
All
All
GMC
Sierra,
Yukon
Models
2015
2016
All
All
Brand:
Model:
Buick
Model Year:
VIN:
from
to
from
to
Enclave
2013
2016
SOP
December
1, 2015
Cadillac
ATS,
CTS
2013
Cadillac
Escalade
Models
Chevrolet
Affected Region or Country
North America and all countries that the above models are exported to.
Condition
Some customers may comment when using the Bluetooth® phone system in their
vehicle, the person on the receiving end of a mobile telephone call states the audio
sounds muffled, distorted or has static.
Typically this concern is apparent while driving the vehicle when wind noise, road noise,
vibrations, etc. are present. In some cases, the concern may be improved or eliminated
by pressing on the microphone area during the concern.
Copyright 2016 General Motors LLC. All Rights Reserved.
Page 2
May, 2016
Bulletin No.: 16-NA-137
Cause
3541395
This may be caused by the foam patch on the back of the headliner at the microphone
mounting area coming loose. This foam is a sound barrier for the back side of the
microphone. If the patch is detached, it allows unwanted noise to interfere with the
microphone operation when making a phone call.
Correction
Use the following steps to correct the condition:
1. Lower the front of the headliner trim panel to
access the repair area. Refer to Headlining Trim
Panel Replacement in SI.
Important: Do NOT fully remove the headliner. Only
remove what is necessary to gain access to the mobile
telephone microphone.
Note: If the foam is equipped with a cut out for the
cable, ensure that the cable is positioned properly and
exits through this cut out rather than the edge of the
patch.
4501106
3541386
Note: This photo shows a 2014 Traverse – other
models will be similar but not identical to this photo.
2. Locate the mobile telephone microphone. Remove
the existing foam patch on the back of the
microphone. Use care to not dislodge the
microphone assembly or wiring.
3. Install a new foam patch:
• This photo shows the replacement microphone
patch, which is designed to improve
microphone performance through the use of
dedicated cut outs that are designed to fit
around the harness as well as an updated felt
material that is glued over the foam.
Note: Use care to center the patch over the
microphone before sticking the patch down.
Bulletin No.: 16-NA-137
May, 2016
Page 3
Note: This photo shows a 2014 Traverse – other
models will be similar but not identical to this photo.
If the wiring harness is not firmly attached, using a
hot glue gun, apply GM P/N 12377914 (in Canada,
use 88864881) Hot Melt Adhesive to firmly attach
the harness to the headliner trim panel.
5. Reinstall the front of the headliner trim panel. Refer
to Headlining Trim Panel Replacement in SI.
Parts Information
Description
Part
Number
Qty
Hot Melt Adhesive Sticks
(14 Sticks)
12377914
(U.S.)
88864881
(Canada)
As Req.
Mobile Telephone
Microphone Insulator
23195956
1
3687736
Note: This photo shows a 2014 Traverse – other
models will be similar but not identical to this photo.
• Firmly adhere the patch to the microphone and
surrounding area, ensuring there are no gaps
between the foam and headliner.
4. Inspect the mobile telephone microphone wiring
harness and verify the harness is firmly attached to
the headliner trim panel.
Warranty Information
Labor
Operation
Description
Labor Time
3480028*
Re-secure Mobile Telephone
Microphone Insulator and
Harness
1.0 hr
*This is a unique Labor Operation for Bulletin use only.
3687740
Version
1
Modified
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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