T-SB-0078-21

T-SB-0078-21
September 2, 2021
Parking Brake Warning Light On With DTC C059746
Service
Category
Brake
Section
Parking Brake
Market USA
Applicability
YEAR(S)
MODEL(S)
2020 - 2021
Corolla, Corolla Hatchback,
RAV4
ADDITIONAL INFORMATION
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.
Figure 1. Parking Brake Malfunction Warning Message
© 2021 Toyota Motor Sales, USA
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Parking Brake Warning Light On With DTC C059746
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
BR1928
Reprogram Skid Control Computer
0.8
44050-#####*
8C
99
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being repaired
by searching for the parts in the Electronic Parts Catalog using the VIN filter.
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.
Parts Information
MODEL
PART NUMBER
PART NAME
QTY
Skid Control Computer
–
Authorized Modifications Label
1
89541-12C10
Corolla
89541-02560
Corolla Hatchback
89541-12F30
89541-42781
89541-42771
RAV4
89541-0R140
89541-0R130
All
00451-00001-LBL
NOTE
 The Skid Control Computer 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.
© 2021 Toyota Motor Sales, USA
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Parking Brake Warning Light On With DTC C059746
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVI*
PART NUMBER
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 16.10.017 or later is required.
 Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787.
 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.
© 2021 Toyota Motor Sales, USA
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September 2, 2021
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Parking Brake Warning Light On With DTC C059746
Calibration Information
CALIBRATION ID
MODEL
ECU
PREVIOUS
NEW
F152642711
F15264271300
F152642701
F15264270300
F15260R300
F15260R30200
F15260R290
F15260R29200
F152602280
F15260228100
F152612B90
F152612B9100
F152612B61
F152612B6200
RAV4
Skid Control Computer
Corolla
Corolla Hatchback
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.
© 2021 Toyota Motor Sales, USA
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Parking Brake Warning Light On With DTC C059746
Repair Procedure (continued)
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.
Figure 2. Location of Authorized Modifications Label on 2020 – 2021 model year Corolla,
Corolla Hatchback, and RAV4
TOYOTA MOTOR CORPORATION
AUTHORIZED MODIFICATIONS
THE FOLLOWING MODIFICATIONS HAVE BEEN MADE:
1
2
THESE MODIFICATIONS HAVE BEEN APPROVED
AS APPROPRIATE BY EPA AND CARB
3
DEALER CODE:
CHANGE AUTHORITY:
4
DATE:
5
1
Replacement Skid Control Computer Part
Number e.g., 89541-12C10
4
Date Completed
2
New Calibration ID e.g., F15264271300
5
This SB Number
3
Dealer Code
© 2021 Toyota Motor Sales, USA
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Parking Brake Warning Light On With DTC C059746
Repair Procedure (continued)
3. Flash reprogram the skid control computer.
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 station, refer to the DCA-8000 Instruction Manual
located at TIS – Diagnostics – Tools & Equipment – Battery Diagnostics.
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.
A. Using a permanent marker, enter the following information on the label:

ECM (PCM) part number [Refer to the Parts Information section for the NEW
PART NUMBER]

Calibration ID(s) [Refer to the Calibration Information section for the
NEW CALIBRATION ID]
Dealer Code
Repair Date
Change Authority [This bulletin number]



B. Install the Authorized Modifications Label onto the vehicle at the location shown in
Figure 2. The Authorized Modifications Label is available through the MDC,
P/N 00451-00001-LBL.
5. Test-drive the vehicle to confirm proper operation.
© 2021 Toyota Motor Sales, USA