NHTSA ID Number: 11016784
Manufacturer Communication Number: L-SB-0036-22 Rev2
TSB/Document Date: 2025-04-08
Summary
Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Global Techstream+ (GTS+) ECU flash reprogramming procedures and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard+ (CUW+). To ensure the correct ECU software is installed, ECUs will require a Security Signature before the ECU will initialize the flash reprogramming sequence. This bulletin also details the process for acquiring a Security Signature from TIS during the GTS+ ECU flash reprogramming process.
L-SB-0036-22
Rev2
August 15, 2022
GTS+ ECU Flash Reprogramming With Security
Signature
Service
Category
General
Section
Outline-General
Market USA and Mexico
Applicability
YEAR(S)
MODEL(S)
2024 - 2025
GX550, RZ300E, TX350,
TX500H, TX550H+
2022 - 2025
LS500, LS500H, LX600,
NX250, NX350, NX350H,
NX450H+
2025
LX700H, UX300H
2023 - 2025
RX350, RX350H, RX450H+,
RX500H, RZ450E
ADDITIONAL INFORMATION
REVISION NOTICE
February 10, 2025 Rev2:
• Applicability has been updated to include 2025 model year LS 500, LS 500h, LX 600, LX 700h,
NX 250, NX 350, NX 350h, NX 450h+, RX 350, RX 350h, RX 450h+, RX 500h, RZ 450e, TX 350,
TX 500h, TX 550h+, and UX 300h and 2024 – 2025 model year GX 550 and RZ 300e vehicles.
• The Introduction, GTS+ Preparation, Process Overview, and Operation Procedure sections
have been updated.
• The Parts Information section has been removed.
August 14, 2023 Rev1:
• Applicability has been updated to include 2023 – 2024 model year LS 500, LS 500h, LX 600,
NX 250, NX 350, NX 350h, NX 450h+, RX 350, RX 350h, RX 450h+, RX 500h, RZ 450E and
2024 model year TX 350, TX 500h, and TX 550h+ vehicles.
• The Introduction, Parts Information, GTS+ Preparation, Process Overview, and Operation
Procedure sections have been updated.
Any previous printed versions of this bulletin should be discarded.
© 2025 Lexus
, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
Page 1 of 20
L-SB-0036-22
Rev2
August 15, 2022
Page 2 of 20
GTS+ ECU Flash Reprogramming With Security Signature
Introduction
Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without
replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as
field-fix procedures described in individual Service Bulletins. This bulletin details the Global
Techstream+ (GTS+) ECU flash reprogramming procedures and outlines use of the Technical
Information System (TIS) and the Calibration Update Wizard+ (CUW+). To ensure the correct ECU
software is installed, ECUs will require a Security Signature before the ECU will initialize the flash
reprogramming sequence. This bulletin also details the process for acquiring a Security Signature
from TIS during the GTS+ ECU flash reprogramming process.
NOTE
ECU is a Lexus term used to describe integrated computerized devices responsible for managing the
operation of a system or subsystem. For the purposes of this bulletin, the term “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
Table of Contents
•
Warranty Information ...............................................................................................................3
•
Required Tools & Equipment ...................................................................................................3
•
GTS+ Preparation....................................................................................................................4
•
Select the Correct User Type .............................................................................................4
•
Confirm the Correct VIM .....................................................................................................5
•
Process Overview....................................................................................................................6
•
Operation Procedure ...............................................................................................................7
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
L-SB-0036-22
Rev2
August 15, 2022
Page 3 of 20
GTS+ ECU Flash Reprogramming With Security Signature
Warranty Information
OP CODE
DESCRIPTION
N/A
TIME
OFP
T1
T2
–
–
–
–
Not Applicable to Warranty
Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
DSS-5000 Battery Diagnostic Tool*
DSS-5000P T
1
DCA-8000 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).
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVi*
Techstream 2.0
Techstream Lite
PART NUMBER
QTY
TSADVUNIT
ADE
Techstream Lite (Green Cable)
TS2UNIT
TSLITEPDLR01
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.
• 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 03/07/2025
1
L-SB-0036-22
Rev2
August 15, 2022
GTS+ ECU Flash Reprogramming With Security Signature
GTS+ Preparation
Select the Correct User Type
1. Launch GTS+.
2. From the initial login screen select the Country
and the User Type.
Figure 1.
NOTE
The appropriate User Type MUST be selected
for GTS+ to function correctly.
3. Click Server Login.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
Page 4 of 20
L-SB-0036-22
Rev2
August 15, 2022
GTS+ ECU Flash Reprogramming With Security Signature
GTS+ Preparation (continued)
Confirm the Correct VIM
GTS+ software requires a VIM selection before it can be used for reprogramming.
1. Select GTS+ Settings from the Main Menu screen.
2. Select VIM Select from the GTS+
Settings menu.
Figure 2.
3. Select the correct interface setup from the
dropdown list.
•
Mongoose-Plus MFC3 VIM:
• Techstream Lite w/Blue & Black Case
w/Detachable Cable
• Techstream ADVi w/Grey Case
•
MongoosePro MFC2 VIM:
• Techstream Lite w/Green Case
• Techstream ADVi w/Black Case
•
MongoosePro MFC VIM:
• Techstream Lite w/Blue Case
• Techstream Lite w/Updated Clear Case
• Techstream 2.0
NOTE
The Mongoose driver MUST be installed before
Mongoose selections will be available. For
additional information, see
TIS – Diagnostics – Scantool.
4. Click the arrow in the bottom right corner.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
Page 5 of 20
L-SB-0036-22
Rev2
August 15, 2022
Page 6 of 20
GTS+ ECU Flash Reprogramming With Security Signature
Process Overview
1. Verify the vehicle’s applicability for recalibration and locate the desired calibration file by
performing the GTS+ Health Check function.
NOTE
• GTS+ will automatically search TIS for the appropriate Service Bulletin using the current
calibration ID from the vehicle if the PC is connected to the network (see the figures below).
• Calibration file links can be found embedded in the corresponding Service Bulletin.
Figure 3.
Figure 4.
2. Connect the DCA-8000 battery diagnostic tool using “Power Supply Mode” ONLY.
The DCA-8000 battery diagnostic tool includes a power supply mode to help maintain battery
voltage at 13.5V during ECU reprogramming.
NOTICE
• ECU damage may occur if the correct battery charger mode setting is NOT used.
• Refer to Vehicle Reprogramming Tips for other approved chargers, located at
TIS – Diagnostics – Reprogramming – Reference Documents.
• 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.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
L-SB-0036-22
Rev2
August 15, 2022
Page 7 of 20
GTS+ ECU Flash Reprogramming With Security Signature
Process Overview (continued)
3. Locate the appropriate calibration ID and reprogram the vehicle ECU with GTS+.
GTS+ uses the CUW+ application to open calibration files and facilitate the ECU flash
reprogramming process.
4. Attach the Authorized Modifications Label.
Modifications to ECU calibrations MUST be recorded and properly displayed on the vehicle
using the Authorized Modifications Label.
Operation Procedure
1. Verify the vehicle’s applicability for recalibration and locate the desired calibration file.
A. Connect GTS+ and establish a vehicle connection.
B. Click the Health Check button on the
Main Menu.
Figure 5.
C. A Health Check completed window opens.
To continue, click either Yes or No.
(1) Click Yes to include additional
information in the Health Check.
(2) Click No if additional information is
NOT desired.
Figure 6.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
L-SB-0036-22
Rev2
August 15, 2022
Page 8 of 20
GTS+ ECU Flash Reprogramming With Security Signature
Operation Procedure (continued)
D. Available calibration updates are indicated by a Yes in the Calibration Update column.
Click the Yes link in the calibration information section to access the appropriate Service
Bulletin on TIS.
NOTE
• Note ANY DTCs stored in systems that will be flash reprogrammed.
• Clicking the Yes link will automatically launch TIS and perform a calibration search.
Figure 7.
E. Login to TIS.
HINT
If already logged in, skip this step.
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TSB/Document ID: L-SB-0036-22 Rev2
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-10
MFR Internal Campaign ID/Software Version: L-SB-0036-22 Rev2
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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