◄ IMPORTANT UPDATE ►
The attached Technical Instructions have been updated. Refer to the details below.
DATE
07/11/2025

TOPIC
Instruct to disconnect the cooling fans during vehicle preparation. Note that
unverified closed campaigns may be subject to a debit.

The most recent update in the attached Technical Instructions will be highlighted with a red box.

Please review this notification with your staff to assure that all relevant personnel have been briefed regarding
this subject.
Thank you for your cooperation.

© 2025 Toyota Motor Sales, USA

TECHNICAL INSTRUCTIONS
FOR
25TC03
REPROGRAMMING FOR FORWARD RECOGNITION CAMERA
CERTAIN
2023 COROLLA CROSS
2023 COROLLA CROSS HV
2023 bZ4X
UPDATE: 04/21/2025
Removed “YES” indicator in the ECU calibration ID check. Must visually verify the ECU calibration ID to be updated.
Update the background detail to match dealer letter.
UPDATE: 04/29/2025
Update the operation flow chart to clarify, 23TC01 is N/A for all vehicles included in 25TC03.
UPDATE: 07/11/2025
Instruct to disconnect the cooling fans during vehicle preparation. Note that unverified closed campaigns may be
subject to a debit.

The repair quality of covered vehicles is extremely important to Toyota. All dealership technicians
performing this recall are required to successfully complete the most current version of the ELearning course “Safety Recall and Service Campaign Essentials”. To ensure that all vehicles have the
repair performed correctly; technicians performing this recall repair are required to have completed
the following course:
• TIC206A – Electrical Repair 1
It is the dealership’s responsibility to select technicians with the above certification level or greater to
perform this recall repair. Carefully review
your resources, the technician skill level, and ability
before assigning technicians to this repair. It is important to consider technician days off and
vacation schedules to ensure there are properly trained technicians available to perform this repair at
all times.

I.

OPERATION FLOW CHART

The flow chart is for reference only. DO NOT use it in place of the full technical instructions. Follow ALL
steps as outlined in the full technical instructions to confirm the campaign is completed correctly.

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II. IDENTIFICATION OF AFFECTED VEHICLES
1. CHECK VEHICLE FOR CAMPAIGN ELIGIBILITY
a) Compare the vehicles VIN to the VIN listed on the Repair Order to ensure they match.
b) Check the TIS Vehicle Inquiry System to confirm the VIN is involved in this Campaign, and that it has not
already been completed.
HINT:
TMNA warranty will not reimburse dealers for repairs completed on vehicles that are not affected or
were previously completed, even by another dealer.

III. PREPARATION
1. TOOLS & EQUIPMENT




T-SB-0021-25
DCA-8000 Battery Diagnostic Station
GTS+

IV. BACKGROUND
Included vehicles are equipped with Toyota Safety Sense (TSS) 3.0, which includes the Pre-Collision System (PCS),
which uses the forward recognition camera. In rare cases, a software programming issue can damage the forward
recognition camera. This will result in the Pre-Collision System not working the next time the car is started.
The remedy for this campaign involves updating the TSS 3.0 system to software version 02.02. In addition to addressing
the condition in this campaign, this software update provides the following enhancements.
 Adding Proactive Driving Assist (PDA).
o Proactive Driving Assist (PDA) uses the vehicle’s camera and radar, when system operating conditions are
met, to provide gentle braking and/or steering to support driving tasks such as distance control between
the vehicle and a preceding vehicle, pedestrian, or bicyclist. PDA can also provide gentle braking into
curves.
o For more information see: https://www.toyota.com/owners/warranty-owners-manuals/and input the vehicle
model and model year. A Proactive Driving Assist supplemental owner’s manual is available.
o Note: This feature will be disabled by the dealer by default after the software update.
 Road Sign Assist (RSA): Enhancement of detection threshold (speed and distance) of road sign display feature.
 Other: Additional minor improvements to support future software updates.

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V. SAFETY PRECAUTIONS
CRITICAL INFORMATION - READ THOROUGHLY

An ECU could be damaged if an error occurs in the communication while reprogramming the ECU. Confirm all work
is performed as described in these instructions.

1. STABILIZE THE POWER TO THE PERSONAL COMPUTER SIDE
a) Be sure to connect the personal computer to an external AC power
supply.
NOTICE:
The ECU could be damaged if the battery voltage of the personal
computer drops while reprogramming.

b)

Turn off the screen saver and power saving mode of the personal
computer so that the power to the hard disk is kept supplied.

NOTICE:
If the screen saver or power saving mode launches while
reprogramming, the communication may be disconnected,
resulting in the damage of the ECU.

c)

DO NOT block the ventilation opening for the cooling fan of the
personal computer.

NOTICE:
If the ventilation opening for the cooling fan is blocked with a
sheet cover or the like, the personal computer may be heated
excessively, causing the operation of the personal computer to
stop.
Due to the stop of the operation, the communication for
reprogramming signals could be stopped, resulting in the damage
of the ECU.

VI. FRONT RECOGNITION CAMERA SYSTEM CALIBRATION ID VERIFICATION
1. Perform a health check.
a) Using a GTS+, click the “Health Check” button on the Main Menu.

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Judgment

Content of work

NO DTC
C1A9346
Model

MY Min MY Max

Action

Confirm 23TC01 SSC has been
completed, then update the
software on the forward recognition
camera.
Replace the forward recognition
camera with the NEW one.
(Reflash is unnecessary. Campaign
completed.)

Check current calibration (Do the next
procedure is shown below.)

See table below for Repair Manual Links

Repair Manual Link

Corolla
Cross

2023

2023

ADVANCED DRIVER ASSISTANCE SYSTEM: FRONT CAMERA: REMOVAL; 2023
- 2025 MY Corolla Cross Corolla Cross HV [11/2022 ]

Corolla
Cross HV

2023

2023

ADVANCED DRIVER ASSISTANCE SYSTEM: FRONT CAMERA: REMOVAL; 2023
- 2025 MY Corolla Cross Corolla Cross HV [11/2022 ]

bZ4X

2023

2023

ADVANCED DRIVER ASSISTANCE SYSTEM: FRONT CAMERA: REMOVAL; 2023
- 2025 MY bZ4X [03/2022 ]

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2. CHECK CURRENT CALIBRATION
a) Locate the Calibration Update column of the “Calibration Information” for the Front Recognition Camera
system on the "Health Check Result" screen.
b) Note – The update column may not list a “YES” indicating that an update is necessary. For this reason,
it is imperative to compare the current Calibration ID to the NEW Calibration ID.

Front Recognition Camera Calibrations
System
Front Recognition
Camera

Front Recognition Camera Calibration ID
Current Calibration ID
New Calibration ID

Model
bZ4X

8646F4206400

8646F4206700

COROLLA CROSS
COROLLA CROSS HYBRID

8646F1606300

8646F1611200

◄ CRITICAL MESSAGE ►
It is critical that T-SB-0021-25 in addition to the Technical Instructions for this Special Service Campaign are followed.
This TSB outlines all steps necessary to prevent reprogramming failure. Toyota will not provide reimbursement coverage
for reprogramming failures if this TSB is not followed

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VII. VEHICLE PREPERATION
1. VEHICLE PREPARATION
a) Confirm the following conditions:
Vehicle in the IG position (for HEV and BEV Model:
READY OFF, for Gasoline Model: engine OFF)

Turn off all electrical accessories (i.e. climate control,
audio system, etc.)

Transaxle in Park

Headlight switch in the DRL OFF position. (w/ DRL OFF
position)

Parking brake engaged

Windshield wiper switch in the OFF position

2. CONNECT THE 12V BATTERY TO A POWER SUPPLY
a) Connect the DCA-8000 or other type of a power supply (not a battery charger) to the 12 V battery.
b) Tap the Reflash icon from the Main Menu screen of the DCA-8000.
A power supply MUST be used during reprogramming. ECU damage will occur if the battery
voltage is not properly maintained during this re-flash procedure.
NOTICE:
A power supply must be connected directly to the 12V battery terminals and NOT the remote jump
posts under the hood (if equipped). If the 12V battery voltage drops during the re-flash procedure,
ECU damage can occur. If ECU damage occurs due to failure to follow these instructions, your
dealership will be responsible for costs associated with all ECU replacement.

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3.

PREVENT THE OPERATION OF THE COOLING FAN (FOR COROLLA CROSS AND COROLLA CROSS
HYBRID)
a) Be sure to disconnect the two cooling fan wire harnesses on the radiator fan shroud.
b) Cover the disconnected connectors with tape to prevent foreign material from entering/adhering to them.
If the cooling fan runs during the re-flash procedure, the battery voltage may become
inconsistent and can cause permanent damage to the ECU.

4. VERIFY GTS+ SETUP
a) Verify that the GTS+ meets the following conditions:
 The latest version of software is loaded.
 The GTS+ battery is fully charged. If not, connect the GTS+ to a 120 V source.
 The DLCIII cable is in good condition.
The GTS+ battery voltage must also be maintained during the re-flash procedure. If necessary,
plug the GTS+ into a 120 v outlet during this procedure.
NOTICE:
If the GTS+ communication with the vehicle fails during the re-flash procedure, the forward recognition
camera will be damaged.

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VIII.

UPDATE CALIBRATION

1. CONFIRM THE ECU CALIBRATION ID
a) Confirm the current calibration ID in the Front Recognition Camera System.
b) Note: The update column may not say there is calibration update available.

The calibration IDs to re-flash in this campaign are as shown in the table below.

Front Recognition Camera Calibrations
System
Front Recognition
Camera

Model

Front Recognition Camera Calibration ID
Current Calibration ID
New Calibration ID

bZ4x

8646F4206400

8646F4206700

COROLLA CROSS
COROLLA CROSS HYBRID

8646F1606300

8646F1611200

**NOTE: If the current calibration ID is an earlier version, it means that Special Service Campaign 23TC01 may have not
yet been completed.

Special Caution:
Some vehicles may also be affected by Special Service Campaign 23TC01, Toyota
Safety Sense Inoperative Intermittently.
23TC01 must be completed before 25TC03.
23TC01 Technical Instructions
Please note 23TC01 takes 0.7 hours to complete.

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2. REFLASH THE FORWARD RECOGNITION CAMERA
a) Download the applicable calibration CUW file from the table above.
NOTICE:
Reflash failure should be extremely rare and can be avoided by following all instructions and
reprogramming best practices.

IX. COMPLETE REPAIR
1.

DISCONNECT THE DCA-8000

2.

CONNECT THE COOLING FAN(s) WIRE HARNESS(s)

3. PERFORM VERIFICATION HEALTH CHECK
a) Using a GTS+, click the “Health Check” button on the Main Menu.
b) Clear DTC’s that may have set during the re-flash procedure.
THIS VERIFICATION HEALTH CHECK IS NECESSARY to
update the results and CIDs to the national database.

4.
5.

Re-run the Health Check to confirm that no DTC’s reappear.

CONFIRM CID UPDATE
a) On the Stored Data tab, confirm the following for the Front Recognition Camera system:
b)
c)

The Calibration number has the “New CID” number.
***Campaigns closed without confirming the “New CID” number may be subject to a debit.

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6.

Deactivate PDA after reflash.

This feature is turned on by be default after completing this software update. Please navigate to the PDA settings and
deactivate this feature using the steering wheel controls. Advise the customer that this new feature is available and
show them how to activate it if they would like to.

If you see the image in the green box below, this means that PDA is turned on.

7. PRINT CUSTORMER HEALTH CHECK REPORT
a) From the Stored Data tab, select the Customer Health Check
Report button (TIS will launch when button is pressed).
b) Log in to TIS.
c) Input Vehicle Mileage and Repair Order number.
d) Check the “Performed” campaign button for the applicable
campaigns.
e) Select the Report button.

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◄ VERIFY REPAIR QUALITY ►
-

Confirm the reflash completes successfully and the 2nd health check shows the NEW calibration ID.
Confirm there are no DTCs after the Calibration update.
Confirm the PDA feature is turned off in vehicle settings.
Confirm cooling fans are reconnected on Corolla Cross and Corolla Cross Hybrid
If you have any questions regarding this update, please contact your area representative.

X. APPENDIX
A. CAMPAIGN DESIGNATION DECODER

Examples:
20TA01 = Launched in 2020, Toyota, Safety Recall Remedy Phase, 1st Safety Recall Launched in 2020
21TC02 = Launched in 2021, Special Service Campaign, 2nd Special Service Campaign Launched in 2021
22TE05 = Launched in 2022, Customer Support Program, 5th Customer Support Program Launched in 2022

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