NHTSA ID Number: 11018355
Manufacturer Communication Number: L-SB-0024-25
TSB/Document Date: 2025-05-15
Summary
Some 2023 – 2025 model year RX 350, RX 350h, RX 500h, and 2024 – 2025 model year TX 350, TX 500h, and TX 550h+ vehicles may exhibit a condition where the Blind Spot Monitor (BSM) system is inoperative, there is a BSM malfunction message on the multi-information display (MID), or the driving assist information indicator is illuminated, along with one or more of the following Diagnostic Trouble Codes (DTCs) present: •C1AB413 – Outer Mirror Indicator (Module "B" Side) Circuit Open •C1AB513 – Outer Mirror Indicator (Module "A" Side) Circuit Open The BSM sensor software has been updated to reduce the possibility of these conditions.
L-SB-0024-25
April 18, 2025
Blind Spot Monitor Inoperative With DTC C1AB413
and/or C1AB513
Service
Category
Audio/Visual/Telematics
Section
Park Assist/Monitoring
Market USA
Applicability
YEAR(S)
MODEL(S)
2023 - 2025
RX350, RX350H, RX500H
2024 - 2025
TX350, TX500H, TX550H+
ADDITIONAL INFORMATION
Introduction
Some 2023 – 2025 model year RX 350, RX 350h, RX 500h, and 2024 – 2025 model year TX 350,
TX 500h, and TX 550h+ vehicles may exhibit a condition where the Blind Spot Monitor (BSM)
system is inoperative, there is a BSM malfunction message on the multi-information display (MID),
or the driving assist information indicator is illuminated, along with one or more of the following
Diagnostic Trouble Codes (DTCs) present:
C1AB413 – Outer Mirror Indicator (Module "B" Side) Circuit Open
C1AB513 – Outer Mirror Indicator (Module "A" Side) Circuit Open
The BSM sensor software has been updated to reduce the possibility of these conditions. Follow
the Repair Procedure in this bulletin to address these conditions.
© 2025 Lexus
, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 05/07/2025
Page 1 of 5
L-SB-0024-25
April 18, 2025
Page 2 of 5
Blind Spot Monitor Inoperative With DTC C1AB413 and/or C1AB513
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EL2509
Reprogram Both Blind Spot Monitor Sensors
1.1
88162-#####*
87
74
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being
repaired by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
This repair is covered under the Lexus Basic Warranty. This warranty is in effect for
48 months or 50,000 miles, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
Parts Information
PART NUMBER
PREVIOUS
NEW
88162-0E130
88162-0E131
88162-0E132
88162-0E200
88162-0E210
88162-0E220
88162-0E201
88162-40020
88162-47070
88162-48220
88162-58040
88162-58050
88162-58051
88162-0E133
88162-0E134
PART NAME
QTY
Sensor, Blind Spot Monitor
–
NOTE
The BSM sensors should NOT be replaced as part of the Repair Procedure.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 05/07/2025
L-SB-0024-25
April 18, 2025
Page 3 of 5
Blind Spot Monitor Inoperative With DTC C1AB413 and/or C1AB513
Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
DCA-8000 Battery Diagnostic Tool*
DCA-8000P T
1
*Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-368-6787 or by visiting
Home – Service Resources – Lexus Special Service Tools (SSTs).
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVi*
Techstream Lite
PART NUMBER
QTY
TSADVUNIT
ADE
Techstream Lite (Green Cable)
TSLITEPDLR01
1
TSLP2DLR01
*Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
GTS+ software version 2025.01.005.02 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787 or by visiting TIS – Diagnostics – Tools & Equipment – Techstream Order Portal.
Use Techstream or an approved J2534 interface to perform flash reprogramming updates.
Visit techinfo.toyota.com for more information regarding J2534 reprogramming.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 05/07/2025
L-SB-0024-25
April 18, 2025
Page 4 of 5
Blind Spot Monitor Inoperative With DTC C1AB413 and/or C1AB513
Calibration Information
CALIBRATION ID*
MODEL
NEW
PREVIOUS
RX 350
RX 350h
RX 500h
TX 350
TX 500h
TX 550h+
BSM SENSOR A
BSM SENSOR B
8816F0E03000
8816F4002000
8816F4707000
8816F4817400
8816F4817300
8816F4817600
8816F5804000
8816F5805000
BSM “A” – 8816F5805100
BSM “B” – 8816F5805100
8816F3004100
8816F5005000
8816F6005000
BSM “A” – 8816F5005100
BSM “B” – 8816F5005100
NOTE
Both BSM Sensors need to be updated.
BSM “A” and BSM “B” files are unique even though the CAL IDs appear the same.
Repair Procedure
1. Confirm the condition.
Does the vehicle exhibit a condition where the BSM system is inoperative, there is a BSM
malfunction message on the MID, or the driving assist information indicator is illuminated,
along with one or more of the following DTCs present?
C1AB413 – Outer Mirror Indicator (Module “B” Side) Circuit Open
C1AB513 – Outer Mirror Indicator (Module “A” Side) Circuit Open
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 05/07/2025
L-SB-0024-25
April 18, 2025
Page 5 of 5
Blind Spot Monitor Inoperative With DTC C1AB413 and/or C1AB513
Repair Procedure (continued)
2. Use GTS+ to confirm the BSM sensor calibrations.
Are the calibration IDs for the BSM sensors the latest listed in the
Calibration Information section?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
NO — Continue to step 3.
3. Flash reprogram BOTH BSM sensors.
NOTE
The battery diagnostic tool MUST be used in Power Supply Mode to maintain battery voltage at
13.5V while flash reprogramming the vehicle.
For details on how to use the battery diagnostic tool, refer to the DCA-8000 Instruction Manual
located at TIS – Diagnostics – Tools & Equipment – Battery Diagnostics.
Follow the procedures outlined in L-SB-0036-22, GTS+ ECU Flash Reprogramming With
Security Signature, and flash reprogram both BSM sensors with the NEW calibration
file update.
4. Using GTS+, clear ANY DTCs and test drive the vehicle to confirm the conditions are no
longer present.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 05/07/2025
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TSB/Document ID: L-SB-0024-25
Replacement Service Bulletin Number:
MFR Communication Date: 2025-04-18
MFR Internal Campaign ID/Software Version: L-SB-0024-25
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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