MG

Moderator
Please see T-SB-0026-20 Revision 1

Applicability:
2020 - 2021 4Runner
2018 - 2021 Sequoia, Tacoma, Tundra

REVISION NOTICE:
December 15, 2020 Rev1:
The Repair Procedure section has been updated.
Any previous printed versions of this bulletin should be discarded.

Introduction:
All 2018 – 2021 model year Sequoia, Tacoma, and Tundra and 2020 – 2021 model year 4Runner vehicles are equipped with Pre-collision System (PCS) and Dynamic Radar Cruise Control (DRCC) as part of the Toyota Safety Sense (TSS) package. The PCS and DRCC systems are designed to help mitigate a potential collision and maintain a pre-determined traveling distance.

It is recommended to disable the PCS and DRCC systems on vehicles that have been modified (ride height, oversized wheels/tires, brush bars, etc.) in a way that potentially disrupts the functionality of these systems. Vehicle owner’s written consent is required before performing the calibration to permanently disable the PCS and DRCC systems. Follow the Repair Procedure in this bulletin to disable the PCS and DRCC systems.

WARNING:
Once this calibration has been performed, the PCS and DRCC systems will be PERMANENTLY DISABLED. Replacing the millimeter wave radar is REQUIRED to reinitiate the PCS and DRCC systems.


Repair Procedure:
1. Does the vehicle have modifications that may potentially disrupt PCS and DRCC system functionality? Examples of modifications include, but are not limited to, changes in ride height, oversized wheels/tires, and brush bars.
YES — Continue to step 2.
NO — This bulletin does NOT apply.

2. Has the customer agreed to disable the millimeter wave radar and reviewed the Owner’s Manual Insert?
YES — Continue to step 3.
NO — This bulletin does NOT apply.

WARNING:
Once this calibration has been performed, the PCS and DRCC systems will be PERMANENTLY DISABLED. Replacing the millimeter wave radar is REQUIRED to reinitiate the PCS and DRCC systems

3. Using Techstream, perform Health Check and clear ANY stored Diagnostic Trouble Codes (DTCs).

4. Flash reprogram the Radar ECU.

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.

5. Reset the EFI-ECU using the following links to the reset tools.
* Sequoia, 4Runner, Tundra: Reset Tool
* Tacoma: Reset Tool

6. Confirm the PCS OFF light is Illuminated.

7. Using Techstream, perform Health Check

8. Attach the modified vehicle label to the steering column.

9. Confirm the constant speed cruise control operation

11. The PCS and DRCC systems are now PERMANENTLY disabled.
 
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