21-BE-010H

GROUP
NUMBER
BODY ELECTRICAL
Technical Service Bulletin
SUBJECT:
DATE
21-BE-010H
MODEL(S)
AUGUST, 2021
VARIOUS
BLIND-SPOT COLLISION WARNING (BCW/BSD) MODULE
TROUBLESHOOTING INFORMATION
This TSB supersedes 19-BE-009H to include another DTC code, C164C/D.
Description: This bulletin provides information for troubleshooting of the Blind-Spot Collision Warning
(BCW/BSD) system whenever it exhibits Diagnostic Trouble Code (DTC) C120B/D, C160A, or
C164C/D.
C120D15 - Left Led Circuit Short To B
C120B15 - Right Led Circuit Short To B Or Open
C160A88 - BSD Local CAN bus off
C164C87- Local CAN time-out Rear Right
C164D87- Local CAN time-out Rear Left
NOTICE
When a vehicle exhibits Diagnostic Trouble Code (DTC) C120B/D, C160A, or C164C/D, check
the wiring harness connections before attempting to replace the Blind-Spot Collision Warning
(BCW/BSD) module(s).
NOTICE
The information provided in this bulletin is a general guidance to assist the technician. The
information is not specific to any vehicle. Please refer to the Electrical Troubleshooting Manual
(ETM) for the specific model to locate the general area described below.
Applicable Vehicles: All Models and Model Year equipped with the Blind-Spot Warning system.
Warranty Information:
Normal Warranty Applies
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
BLIND-SPOT COLLISION WARNING (BCW/BSD) MODULE
TROUBLESHOOTING INFORMATION
Service Procedure:
DTC C120D15/C120B15
C120D15 - Left LED Circuit Short To B.
This DTC refers to an electrical connection
concern between the left side mirror BCW/BSD
LED light indicator, and the left side BCW/BSD
module.
Left BSD LED Light Indicator
C120B15 - Right LED Circuit Short To B or
Open.
This DTC refers to an electrical connection
concern between the right side mirror BCW/BSD
LED light indicator, and the right side BCW/BSD
module.
Right BSD LED Light Indicator
Check the Following in
Relation to the DTC:
1. Check continuity (<1ohm)
from BCW/BSD module to
BCW/BSD light indicator.
2. Check mirror assembly
and/or wire harness for open,
shorted, frayed wires or poor
connector fastening.
DTC C120B15/C120D15 :
Check the continuity or connection condition
between BCW and outside mirrors
3. Check connector pins for
tension, corrosion, or
damage. Confirm the
connector is fully seated
(disconnect and reconnect
the connector).
4. If steps 1-3 are confirmed
normal, then proceed with
replacing the BCW/BSD
module(s) according to the
DTC code.
NOTICE
If the harnesses between the BCW/BSD modules are found faulty, down level parts (BCW Sensor,
DTC C160A88
Bracket, and Wire Extension) are available. Refer to the parts catalog for the latest part number.
TSB #: 21-BE-010H
Page 2 of 4
SUBJECT:
SUBJECT:
BLIND-SPOT COLLISION WARNING (BCW/BSD) MODULE
TROUBLESHOOTING INFORMATION
C160A88 - BSD Local CAN bus off
This DTC generally refers to an electrical
connection concern between the left side and
the right side BCW/BSD modules.
Check the Following:
1. Check continuity (<1ohm)
of the High and Low CAN line
between the two BCW/BSD
modules.
DTC C160A88:
Check the continuity or connection condition of the high and low
CAN line between the two BCWs.
2. Check wire harness for
open, shorted, frayed wires
or poor connector fastening.
3. Check connector pins for
tension, corrosion, or
damage. Confirm the
connector is fully seated
(disconnect and reconnect
the connector).
4. If steps 1-3 are confirmed
normal, then proceed with
replacing the BCW/BSD
module(s).
NOTICE
If the harnesses between the BCW/BSD modules are found faulty, down level parts (BCW Sensor,
Bracket, and Wire Extension) are available. Refer to the parts catalog for the latest part number.
DTC C164C87/C164C87
TSB #: 21-BE-010H
Page 3 of 4
SUBJECT:
SUBJECT:
BLIND-SPOT COLLISION WARNING (BCW/BSD) MODULE
TROUBLESHOOTING INFORMATION
C164C/D87 - BSD Local CAN bus off
This DTC generally refers to an electrical
connection concern between the left side and
the right side BCW/BSD modules.
Check the Following:
1. Check continuity (<1ohm)
of the High and Low CAN line
between the two BCW/BSD
modules.
2. Check wire harness for
open, shorted, frayed wires
or poor connector fastening.
DTC C164D87, C164C87 :
Check the continuity or connection condition of the high and low
CAN line between the two BCWs.
3. Check connector pins for
tension, corrosion, or
damage. Confirm the
connector is fully seated
(disconnect and reconnect
the connector).
4. If steps 1-3 are confirmed
normal, then proceed with
replacing the BCW/BSD
module(s).
NOTICE
If the harnesses between the BCW/BSD modules are found faulty, down level parts (BCW Sensor,
Bracket, and Wire Extension) are available. Refer to the parts catalog for the latest part number.
TSB #: 21-BE-010H
Page 4 of 4
SUBJECT: