PIT5921

Bulletin No.: PIT5921
Published date: 06/9/2022
Preliminary Information
PIT5921 Rear View Camera Coaxial Related Issues-B395A - B395B - B395C - B101E B101D
Product Investigation Review Required
Models
Brand:
Model:
Model Years:
VIN:
from
Engine:
to
Transmissions:
Buick
Enclave
2020 - 2022
All
All
All
All
Buick
Encore GX
2020 - 2022
All
All
All
All
Buick
LaCrosse
2019 - 2022
All
All
All
All
Buick
Velite
2021 - 2022
All
All
All
All
Cadillac
CT6
2019 - 2022
All
All
All
All
Cadillac
XT4
2019 - 2022
All
All
All
All
Cadillac
XT5
2020 - 2022
All
All
All
All
Cadillac
XT6
2020 - 2022
All
All
All
All
Chevrolet
Blazer
2019 - 2022
All
All
All
All
Chevrolet
Bolt EV
2019 - 2022
All
All
All
All
Chevrolet
Bolt EUV
2022
All
All
All
All
Chevrolet
Equinox
2019 - 2022
All
All
All
All
Chevrolet
Silverado 1500
2019 - 2022
All
All
All
All
Chevrolet
Silverado HD 2500/3500
2020 - 2022
All
All
All
All
Chevrolet
Traverse
2020 - 2022
All
All
All
All
GMC
Acadia
2019 - 2022
All
All
All
All
GMC
Sierra 1500
2019 - 2022
All
All
All
All
GMC
Sierra HD 2500/3500
2020 - 2022
All
All
All
All
GMC
Terrain
2019 - 2022
All
All
All
All
Involved Region or Country North America
Additional Options (RPO)
Surround Camera System UV2 or UVS, or Trailer Camera System UVI
Some customers may comment on seeing a black screen and a triangle icon on the radio display when in reverse.
Condition
Technicians may nd one or more of the following DTC's B395A, B395B, B395C, B101E, B101D
Note: Radios with infotainment version 3.4 will display blue screen compared to the black screen from version 3.5 onward.
Possible Causes:
Condition may be related to a camera, coaxial cable, or connector due to vibrations that are higher than the
components can withstand which can cause failure.
The coaxial cable connectors to the cable may have excessive resistance that interrupts the video signal and causes
the black screen.
SD Card can cause the surround view system to undergo resets resulting in intermittent black screens.
Cause
Correction:
Verify the condition by using the K157 Video Processing Module (VPM) Fail counters in GDS2 and cross reference stored DTC’s with the trouble shooting
table below to determine most probable cause.
Preliminary Service Procedure
Water Intrusion
Some customers may comment on a blue or black screen with Service Rear Vision System message when shifting into Reverse. (Truck Only,
Model Year 2019 to 2020). Refer to Service Bulletin# 18-NA-383 for additional steps and how to identify if this is a water intrusion issue.
VPM SPS Programming
If the A11 Radio has all three history DTC B395A Symptom Bytes 08, 72, and 3A, then refer to Service Bulletin # 19-NA-076: Blue or Black
Screen and Service Rear Vision System Message on Radio Display Shifting into Reverse. Reprogramming the VPM software may reduce
sensitivity of the B101D setting.
Connection Issues
Continue to procedure below if Diagnostic Trouble Codes (DTC) B395A, B395B, B395C, B101E, B101D are found in the K157 Video Processing
Module
Service Procedure
The intent of this PI is to show that in most cases DTC B101E or B101D should NOT result in the replacement of the Video Processing Module
(VPM) or the Radio, but instead inspect for coax and connector issues as well as the SD Card to ensure it is not corrupt.
These counters are listed in priority order from most usefulness to least. The ones outlined in red are considered the most critical and usually
most helpful in root causing surround viewing issues.
Note: The VPM fail counters are not available on VIP architecture vehicles currently.
1. Connect the scan tool to the vehicle’s data link connector and open GDS2 in the Techline Connect application and write down all DTCs stored in the
vehicle.
2. Navigate to the VPM Module to observe the Fail Counters:
Module Diagnostics / K157 Video Processing Module / Video Processing Module Internal Status.
3. The three most critical parameters to look at are:
a. Camera Communication Fail Counter
b. Video Processing Module Reset Counter
c. Camera Open Circuit Counter
4. Write down the counters found in the VPM using the scan tool.
5. Cross-reference the DTC’s and counters with the trouble shooting table below to determine most probable cause.
Module
A11 Radio
A11 Radio
K157 Video
Processing
Module
K157 Video
Processing
DTC’s
B395A
B395A
Symptom
Byte
08
72
B101E
4A
B101D
3C
DTC
Description
Loss of
Video Frames
Froze
Frames
Checksum
Error
Internal
Communication
Video Processing Module
Rear, Front, Right, or Left Camera
Reset Counter
Open Circuit Fail Counter
>20
>0
CHECK
-
COAX/CONNECTOR/CAMERA
Based on Fail Counter
CHECK
-
COAX/CONNECTOR/CAMERA
Based on Fail Counter
CHECK
DO NOT REPLACE
SD CARD / REPLACE K157 VIDEO
PROCESSING MODULE
K157 VIDEO PROCESSING MODULE
CHECK
DO NOT REPLACE
Module
K157 Video
Processing
Module
K157 Video
Processing
Module
Failure
K157 Video
Processing
Module
K157 VIDEO PROCESSING MODULE
CHECK
CHECK
COAX/CONNECTOR/CAMERA
COAX/CONNECTOR/CAMERA
Based on Fail Counter
Based on Fail Counter
CHECK
CHECK
COAX/CONNECTOR/CAMERA
COAX/CONNECTOR/CAMERA
Camera
Based on Fail Counter
Based on Fail Counter
OPEN DTC
CHECK
CHECK
COAX/CONNECTOR/CAMERA
COAX/CONNECTOR/CAMERA
Based on Fail Counter
Based on Fail Counter
CHECK
CHECK
COAX/CONNECTOR/CAMERA
COAX/CONNECTOR/CAMERA
Based on Fail Counter
Based on Fail Counter
B390F
B395B
08
K157 Video
Processing
Module
SD CARD / REPLACE K157 VIDEO
PROCESSING MODULE
B395C
B395A
6. If the condition continues, power cycle the K157 Video Processing Module to see if the issue goes away.
Note: Before testing the coax cable, check the cable's exterior for being pinched, cut, damaged, or having loose connections at the components, all of
which can cause reception issues.
7. If it’s di cult to determine the causal component, unplug all the cameras.
a. Leave the rear camera input and video output at VPM.
b. Activate the Rearview Camera (RVC) using the “Cameras” touch button.
c. If there is no image output, swap to the front, left, or right cameras into VPM rear camera input and repeat previous steps to check images
again.
8. If concern(s) persist, refer to published diagnostics in SI.
Surround Vision Components
K157 Video Processing Control Module
A11 Radio
B87 Rearview Camera
B87CA Rearview Driver Information Camera- Cargo Area (RPO UVN)
B225L Sideview Camera – Left
B225R Sideview Camera – Right
B174G Frontview Camera – Grille
B174W Frontview Camera – Windshield
Trailer Rearview Camera (if customer installed)
Trailer Interior Camera (if customer installed)
Additional Surround Vision System Issues
Refer to published bulletins, PIs and SISI documents for further diagnostic steps on the following issues.
Pink Colored Image Issue
Pink on the screen will be most likely an intermittent Coax issues caused by damaged or frayed coax cables.
Some intermittent conditions can be caused by wire terminal fretting corrosion, which is a build-up of insulating, oxidized wear debris that can
form when there is a small motion between electrical terminals.
Flicker Issue
Verify P17 Info Display Module displays infotainment system information properly. The Video Processing module controls the buttons on the
touch screen.
Con rm the buttons on the touchscreen are functioning properly.
If the “Cameras” Icon is greyed out and not working. The connection issue may be between the VPM and Radio.
If the touch buttons are working properly, it could be an issue with the coax cable connection from the VPM to the Rear Vision Camera.
Note: Before testing the coax cable, check the cable's exterior for being pinched, cut, damaged, or having loose connections at the components, all of
which can cause reception issues.
Rolling Counter Issue
The Radio requires a rolling counter to ensure a video output on the radio screen. This counter prevents a frozen image to be displayed to the
vehicle owner when shifting into reverse.
This rolling counter is monitored continuously to ensure we have video signal from the rear camera. It goes from the rear camera to the VPM and
from the VPM to the Radio.
If the rear camera or the VPM do not provide the rolling counter, you will see the following black screen with an icon:
The VPM does not monitor the left, right or front cameras with a rolling counter. These camera’s will display in black on their perspective side if
there is an issue.
Figure below is of a right camera issue:
VPM Calibration
If the Video Processing Control Module is not calibrated, it will display an hour-glass icon on the infotainment screen. Once calibration is attained,
the hourglass will automatically disappear.
The calibration is performed automatically by the Video Processing Control Module and is needed to have the Video Processing Control Module
learn new cameras and their positions. Please follow the instruction in SI to assist in calibrating the Video Processing Control Module
The Video Processing Control Module can disable rear camera display guidelines if it is not calibrated adequately. Once calibration is attained, the
guidelines should return.
Circuit Issues
An open in the backup lamp control circuit, defective backup lamps, or incorrect/aftermarket backup lamps may cause erratic circuit behavior, such
as unwanted voltage on a circuit when vehicle is no longer in Reverse.
The camera image display remaining active after the vehicle is shifted out of Reverse, may indicate possible backup lamp control circuit issues.
Version History
Version
Created
1
06/08/2022 - Created on.
© 2022 General Motors. All Rights Reserved.