17NA375

File in Section:
Bulletin No.:
Service Bulletin
Date:
17-NA-375
November, 2017
INFORMATION
Subject:
Diagnostic Tips for Rear Vision Camera Image that is Grainy, Distorted and/or
Pixelated
Brand:
Model:
Buick
Cadillac
Chevrolet
GMC
Model Year:
VIN:
from
to
LaCrosse,
Regal
2014
2018
ATS
2013
2018
CTS
2014
2018
ELR
2014
2016
Escalade
Models
2015
2018
CT6
2016
2018
SRX
2013
2016
XTS
2013
2018
Colorado
2015
2018
Corvette
2014
2018
Cruze
2016
2018
Impala
(VIN 1)
2014
2015
Impala
2015
2018
Malibu
2016
2018
Silverado
1500
2014
2014
Silverado,
Suburban,
Tahoe
2015
2018
Volt
2016
2018
Canyon
2015
2018
Sierra 1500
2014
2014
Sierra,
Yukon
Models
2015
2018
Copyright 2017 General Motors LLC. All Rights Reserved.
from
to
Engine:
Transmission:
Page 2
November, 2017
Bulletin No.: 17-NA-375
Involved Region or Country
North America and N.A. Export Regions
Additional Options (RPOs)
Equipped with Radio Infotainment System RPOs (IO4, IO5, IO6, RAO, UAV and UY4)
Condition
Some customers may comment on the rear vision camera image being grainy, distorted
and/or pixelated.
Cause
Depending on the lighting and build variation, this condition may be normal characteristic
rather than a quality issue in the parts, wiring or software.
Vehicles that are equipped with a Human Machine Interface Module, Video Bypass
Module, and/or a Video Processing Module will appear to have a rear camera image that
is noticeably more ‘noisy’, ‘fuzzy’, ‘blurry’, or ‘washed out’. This is inherent to the
engineering of the system and does not immediately indicate an issue with the customers
vehicle. Vehicles with rear vision systems that do not integrate these modules will have a
noticeably ‘crisper’, ‘sharp’, or even more ‘colorful’ image. For example, if you compare a
BYOM equipped Silverado to an NGI equipped Silverado, the rear camera image on the
BYOM system will perform better than that of the NGI equipped Silverado.
Note: This is why the rear camera image on a Silverado/Sierra truck with infotainment
system RPO IOB will typically have a clearer image than one that is equipped with
infotainment system RPOs IO5/IO6.
Correction
If this concern is encountered, it is suggested to compare the image quality to a like
vehicle in the same lighting conditions to ensure it is abnormal before replacing any parts,
such as the HMI, VBM, or VPM. When making the comparison, it is important that it is the
same model year, same infotainment RPOs (IO5 or IO6), and same rear camera system.
If the same concern is exhibited on a like vehicle and there are no DTCs or related PIs/
Bulletins on the issue, it should be considered a normal operating characteristic and no
repairs should be attempted.
If there are DTCs stored and/or the image quality is abnormal as compared to a like
vehicle, inspect the following items as necessary if SI diagnosis does not isolate the
cause of the concerns:
• Clean the lens of the rear camera with isopropyl alcohol and a soft tissue (to avoid
scratching of the lens).
• Check connections at the camera and ensure that there is no corrosion or improper
seating of the terminals or connector.
• Disconnect/reconnect negative battery cable to determine if it corrects any of the
concerns. If so, disconnect/reconnect the VPM, VBM, and/or HMI module one at a
time to power cycle the module and isolate which one may be causing the concern.
• Check for loose connections, bent pins, and/or backed out/loose terminals at the VPM
(if equipped), VBM (if equipped), and/or HMI module.
• Check for excessively taut cables/wiring related to the rear camera system. Wiring/
connector repairs may be a necessity in these cases (DO NOT replace modules if
cable wiring is too short or mis-routed. Exchanging a module will not fix the concern).
• Inspect camera signal circuits 6972 and 6973 for high resistance, poor terminal
tension, bent terminals, shorts to ground, etc. Replace and/or repair any damaged
terminals, modules with bent pins, or wiring as necessary.
Version
1
Modified
Released November 22, 2017
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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION