2020-2021 Toyota Corolla and Rav4 Parking Brake Warning Light On With DTC C059746 T-SB-0078-21

MG

Moderator
Please see T-SB-0078-21

Applicability:
2020-2021 Toyota Corolla, Corolla Hatchback
2020-2021 Toyota RAV4

Introduction:
Some 2020 – 2021 model year Corolla, Corolla Hatchback, and RAV4 vehicles may exhibit a Parking Brake Malfunction warning message on the Multi-information Display (MID) with Diagnostic Trouble Code (DTC) C059746 (Brake System Control Module "A" Calibration / Parameter Memory Failure) present. Follow the Repair Procedure in this service bulletin to address this condition.

Warranty Information:
Repair is to Reprogram Skid Control Computer

APPLICABLE WARRANTY:
This repair is covered under the Toyota Basic Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle’s in-service date. Warranty application is limited to occurrence of the specified condition described in this bulletin.

NOTE:
The Skid Control Computer should NOT be replaced as part of the Repair Procedure

Repair Procedure:
1. Confirm the condition exists. Does the vehicle exhibit a Parking Brake Malfunction warning message on the MID with DTC C059746 present?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.

2. Use Techstream to confirm if the skid control computer calibration has been updated and check for the Authorized Modifications Label affixed to the vehicle in the location shown below. Is the calibration ID listed in Techstream and on the label the latest skid control computer calibration?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
NO — Continue to step 3.

3. Flash reprogram the skid control computer.

Follow the procedures outlined in T-SB-0134-16, Techstream ECU Flash Reprogramming Procedure, and flash the skid control computer with the NEW calibration file update.

4. Prepare and install the Authorized Modifications Label.

5. Test-drive the vehicle to confirm proper operation
 
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