18NA138

File in Section:
Service Bulletin
-
Bulletin No.:
18-NA-138
Date:
May, 2018
TECHNICAL
Subject:
Radio Control (ICS) Display Does Not Remain Off at Times after it has Been Turned Off
in Radio Settings Menu
Brand:
Model:
Buick
Cadillac
Chevrolet
GMC
All GM
Passenger
Cars and
Trucks
Model Year:
VIN:
from
to
from
to
2018
2018
SOP
February
1, 2018
Involved Region or Country
North America and N.A. Export Regions
Additional Options (RPOs)
Equipped with RPO IO5 or IO6 Infotainment System
Engine:
All
Transmission:
All
Condition
5046857
Some customers may comment that the radio control (ICS) display does not remain off at
times even though it has been turned off in the display settings menu shown above.
Cause
This may be due to an interaction between the radio control display, HVAC module, and
OnStar module.
Correction
Refer to the Service Procedure listed below.
Service Procedure
If this concern is experienced, check for DTCs.
If DTCs are found, diagnose and repair as necessary. If
no DTCs are found, use GDS2 to check the part
number of the HMI module. If the part number starts
with something other than 8433, replace the HMI
module using the latest part number listed in the parts
catalog for the VIN number you are working on.
Copyright 2018 General Motors LLC. All Rights Reserved.
HMI module part numbers starting with 8433 include
improvements to address this concern. Refer to Human
Machine Interface Control Module Replacement in SI
for detailed replacement instructions.
Parts Information
Use the latest part number listed in the parts catalog
with the VIN filter on.
Page 2
May, 2018
Bulletin No.: 18-NA-138
Warranty Information
For vehicles repaired under warranty use:
Labor
Operation
Description
Labor Time
3421060
Human Machine Interface
Control Module
Replacement
Use
Published
Labor
Operation
Time
Version
1
Modified
Released April 26, 2018
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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