NHTSA ID Number: 11014220
Manufacturer Communication Number: L-SB-0021-23 Rev2
TSB/Document Date: 2025-02-12
Summary
Some 2022 – 2025 model year Lexus
vehicles may require the download and installation of vehicle specific software or configuration software when the Electronic Control Unit (ECU) is replaced. GTS+ software has been modified to indicate when configuration software is required. A new Configure column has been added to the GTS+ Health Check Results screen to show when configuration software is available for a specific ECU.
L-SB-0021-23
Rev2
March 15, 2023
Replacement ECU Software Configure Process
Service
Category
General
Section
Outline-General
Market USA and Mexico
Applicability
YEAR(S)
MODEL(S)
2024 - 2025
GX550, RX450H+, RZ300E,
TX350, TX500H, TX550H+
2022 - 2025
LX600, NX250, NX350,
NX350H, NX450H+
2025
LX700H
2023 - 2025
RX350, RX350H, RX500H,
RZ450E
ADDITIONAL INFORMATION
REVISION NOTICE
January 30, 2025 Rev2:
Applicability has been updated to include 2025 model year GX 550, LX 600, LX 700h, NX 250,
NX 350, NX 350h, NX 450h+, RX 350, RX 350h, RX 450h+, RX 500h, RZ 300e, RZ 450e, TX 350,
TX 500h, and TX 550h+ vehicles.
The Introduction section has been updated.
April 18, 2024 Rev1:
Applicability has been updated to include 2024 model year GX 550, LX 600, NX 250, NX 350,
NX 350h, NX 450h+, RX 350, RX 350h, RX 450h+, RX 500h, RZ 300e, RZ 450e, TX 350, TX 500h,
and TX 550h+ vehicles.
The Introduction section has been updated.
The Operation Procedure section has been removed.
The Standard ECU Configuration Procedure and ECU Configuration Value Writing Procedure
sections have been added.
Any previous printed versions of this bulletin should be discarded.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Page 1 of 25
L-SB-0021-23
Rev2
March 15, 2023
Page 2 of 25
Replacement ECU Software Configure Process
Introduction
Some 2022 – 2025 model year Lexus vehicles may require the download and installation of
vehicle specific software or configuration software when the Electronic Control Unit (ECU) is
replaced. GTS+ software has been modified to indicate when configuration software is required. A
new Configure column has been added to the GTS+ Health Check Results screen to show when
configuration software is available for a specific ECU.
Follow the Operation Procedure in this bulletin to complete the ECU Software Configure Process.
Certain ECU replacements require CUW reprogramming (Standard ECU Configuration) while
others may only require C-Best Writing (ECU Configuration Value Writing). Please select the
appropriate procedure below, depending on the ECU replaced.
Procedure A: Standard ECU Configuration (CUW Reprogramming)
Procedure B: ECU Configuration Value Writing (Body and Brake ECU Only)
Refer to the applicability chart below for a list of Models and ECUs that will require configuration
software when the specified ECU is replaced:
YEAR(S)
2022 – 2023
MODEL(S)
ECU(S) REQUIRING CONFIGURATION SOFTWARE
LX 600
Airbag / ANC / Body / Brake / ECT / EMPS
NX 250 / NX 350 / NX 350h / NX 450h+
4WD / Airbag / ANC / Body / Brake /
EMPS / Engine
RX 350 / RX 350h / RX 500h
4WD / Absorber Control / Airbag /
ANC / Blindspot / Body / Engine / EMPS /
EMPS Rear / Front Side Radar / HV
RZ 450e
Airbag / Blindspot / Body / EMPS /
EV / Front Side Radar
LX 600
Airbag / ANC / Body / Brake / ECT /
EMPS / TCM
NX 250 / NX 350 / NX 350h
4WD / Airbag / ANC / Body / Brake / EMPS /
Engine / Absorber Control / ECM / ANC
NX 450h+
Brake / Airbag / Absorber Control /
EMPS / Body
RX 350 / RX 350h / RX 450h / RX 500h
4WD / Absorber Control / Airbag / ANC /
Blindspot / Body / Engine / EMPS / EMPS
Rear / Front Side Radar / HV / Inverter / TCM /
Absorber Control
TX 350 / TX 500h / TX 550h+
ECM / HV / Inverter / TCM / 4WD /
Absorber Control / EMPS / ANC / Body /
Airbag / Front Side Radar
GX 550
ECM / TCM / Front Side Radar / Absorber
Control / Airbag / EMPS / ANC /
Blindspot / Body
RZ 300e / RZ 450e
HV / Inverter / Airbag / EMPS / Blindspot /
Body / Front Side Radar
2023
2024
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0021-23
Rev2
March 15, 2023
Page 3 of 25
Replacement ECU Software Configure Process
Introduction (continued)
YEAR(S)
2025
MODEL(S)
ECU(S) REQUIRING CONFIGURATION SOFTWARE
LX600 / LX700h
ECM / HV / TCM / Front Side Radar /
Absorber Control / Brake / Airbag / EMPS /
ANC / Blindspot / Body
NX250 / NX350 / NX350h
Brake / Airbag / Absorber Control / EMPS /
Body / ECM / 4WD / ANC
NX450h+
Brake / Airbag / Absorber Control /
EMPS / Body
RX350 / RX350h / RX450h / RX500h
ECM / HV / Inverter / 4WD / Airbag / Absorber
Control / EMPS / ANC / Blindspot / Body /
Front Side Radar
TX350 / TX500h / TX550h+
ECM / HV / Inverter / 4WD / Absorber Control /
EMPS / ANC / Blindspot / Body / Airbag /
Front Side Radar
GX 550
ECM / TCM / Front Side Radar / Absorber
Control / Airbag / EMPS / ANC /
Blindspot / Body
RZ300e / RZ450e
EV Control / Inverter / Airbag / EMPS /
Blindspot / Body / Front Side Radar
NOTE
ECU is a Lexus term used to describe integrated computerized devices responsible for managing the
operation of a system or subsystem. In this bulletin, ECU is used as a generic label for the following
SAE J1930 standard references:
Powertrain Control Module (PCM).
Engine Control Module (ECM).
Transmission Control Module (TCM).
Any other Lexus specific control unit.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0021-23
Rev2
March 15, 2023
Page 4 of 25
Replacement ECU Software Configure Process
Table of Contents
Warranty Information............................................................................................................... 5
Required Tools & Equipment .................................................................................................. 5
Operation Procedure ............................................................................................................... 6
Procedure A: Standard ECU Configuration (CUW Reprogramming) .................................. 6
Procedure B: ECU Configuration Value Writing (Body and Brake ECU Only) .................. 14
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0021-23
Rev2
March 15, 2023
Page 5 of 25
Replacement ECU Software Configure Process
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
N/A
Not Applicable to Warranty
–
–
–
–
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
PART NUMBER
Techstream ADVi*
QTY
TSADVUNIT
Techstream 2.0
TS2UNIT
ADE
1
Techstream Lite
TSLITEPDLR01
Techstream Lite (Green Cable)
TSLP2DLR01
*Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
GTS+ software version 2024.04.004.02 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787 (USA) or 01-55-50103041 (Mexico) or by visiting TIS – Diagnostics –
Tools & Equipment – Techstream Order Portal.
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
Battery Diagnostic Tool*
DCA-8000P T
1
*Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-368-6787 (USA) or 01-800-504-5330 (Mexico) or by
visiting Home – Service Resources – Lexus Special Service Tools (SSTs).
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0021-23
Rev2
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TSB/Document ID: L-SB-0021-23 Rev2
Replacement Service Bulletin Number:
MFR Communication Date: 2025-01-30
MFR Internal Campaign ID/Software Version: L-SB-0021-23 Rev2
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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