L-SB-0036-22

August 15, 2022

ECU Flash Reprogramming With Security Signature
Service
Category

General

Section

Outline-General

Market USA and Mexico

Applicability
YEAR(S)

MODEL(S)

2022

LS500, LS500H, LX600,
NX250, NX350, NX350H,
NX450H+

ADDITIONAL INFORMATION

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 Techstream
ECU flash reprogramming process and outlines use of 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 Techstream ECU flash
reprogramming process.
Warranty Information
OP CODE

N/A

DESCRIPTION

Not Applicable to Warranty

TIME

OFP

T1

T2

–

–

–

–

Parts Information
PART NUMBER

PART NAME

QTY

00451-00001-LBL

Authorized Modifications Labels

1

NOTE
 The ECM (PCM) should NOT be replaced as part of the Repair Procedure.
 Authorized Modifications Labels may be ordered in packages of 25 from the Materials
Distribution Center (MDC) through Dealer Daily – Parts – Dealer Support Materials Orders.

© 2022 Lexus, a division of Toyota Motor Sales, USA

Page 1 of 18

L-SB-0036-22

August 15, 2022

Page 2 of 18

ECU Flash Reprogramming With Security Signature
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.
 Software version 17.10.012 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).
 Use Techstream or an approved J2534 interface to perform flash reprogramming updates.
Visit techinfo.toyota.com for more information regarding J2534 reprogramming.

SPECIAL SERVICE TOOLS (SST)

PART NUMBER

QTY

Battery Diagnostic Tool*

DCA-8000P T

1

*Essential SST.

NOTE
Additional SSTs may be ordered by calling 1-800-933-8335 (USA) or 01-800-504-5330 (Mexico).

Techstream Preparation
Select the Correct User Type

The appropriate user type MUST be selected for Techstream to function correctly.
Perform the following:

Figure 1.

1. Select Setup from the Techstream main
menu screen.
2. Select Techstream Configuration from the
Setup dropdown menu.
3. Select the area and language.
4. Input information and select US Dealer 1
from the dropdown menu.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0036-22

August 15, 2022

Page 3 of 18

ECU Flash Reprogramming With Security Signature
Techstream Preparation (continued)
Select the Correct VIM

Techstream software requires a VIM selection before it can be used for reprogramming.
Figure 2.

Perform the following:
1. Select Setup from the Techstream main
menu screen.
2. Select VIM Select from the Setup
dropdown menu.

3. Select the correct interface setup from the dropdown list.


If using Techstream ADVi, select MongoosePro MFC2.



If using Techstream 2.0, select MongoosePro MFC.



If using Techstream Lite, select Mongoose MFC (blue or updated clear case) or
MongoosePro MFC2 (green case) depending on the cable being used.
NOTE
Mongoose Driver MUST be installed before Mongoose selections will be available.
See TIS – Diagnostics – Scantool page for additional information.

4. Click OK.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0036-22

August 15, 2022

Page 4 of 18

ECU Flash Reprogramming With Security Signature
Process Overview

Techstream ECU flash reprogramming is a four-step process:
1. Verify the vehicle’s applicability for recalibration and locate the desired calibration file by
performing the Techstream Health Check function.
NOTE
Techstream 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 figures below) .
Calibration file links can be found embedded in the corresponding Service Bulletin.
Figure 3. Not Connected to a Network

Figure 4. Connected to a Network

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.

3. Locate the appropriate calibration ID and reprogram the vehicle ECU with Techstream.
Techstream 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.
© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0036-22

August 15, 2022

Page 5 of 18

ECU Flash Reprogramming With Security Signature
Operation Procedure

1. Verify the vehicle’s applicability for recalibration and locate the desired calibration file.
A. Connect Techstream and establish a vehicle connection.
B. Click the Health Check button on the
System Select tab.

Figure 5.

C. Choose the desired ECU group(s) in
the Health Check dialog box, then
click Next.

Figure 6.

D. Click Continue to view the Health
Check results.

Figure 7.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0036-22

August 15, 2022

Page 6 of 18

ECU Flash Reprogramming With Security Signature
Operation Procedure (continued)

E. Available calibration updates are indicated by a Yes link in the Calibration
Update column.
Click the Yes link 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 8.

F. Log in to TIS. (If already logged in, skip this step.)
G. To review the Service Bulletin and
access the calibration file, click the
Service Bulletin link in the Document
Title column of the Calibration Search
Result portlet.

Figure 9.

NOTE
ONLY Toyota Certified Technicians and
other authorized users may access
calibration files.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0036-22

August 15, 2022

Page 7 of 18

ECU Flash Reprogramming With Security Signature
Operation Procedure (continued)

2. Connect the DCA-8000 battery diagnostic tool.
NOTE
Refer to Vehicle Reprogramming Tips for other approved chargers, located at TIS – Diagnostics –
Reprogramming – Reference Documents.

A. Connect the DCA-8000 battery diagnostic tool to the vehicle and turn it ON.
B. Select Power Supply Mode.
NOTICE
 ECU damage may occur if the correct battery charger and mode setting are NOT used.
 Power Supply Mode is used 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.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0036-22

August 15, 2022

Page 8 of 18