Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026CPI |
Model Year Start: 2023 |
Model: Corolla |
Prod Date Range: [09/2022 -
] |
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): Electric Parking Brake does not Operate; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] |
Electric Parking Brake does not Operate
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
Even if the electric parking brake is operating normally, the parking brake indicator light (red) on the combination meter may be malfunctioning.
PROCEDURE
1.
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CHECK CAN COMMUNICATION SYSTEM
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(a) Check if CAN communication system DTCs are output.
Chassis > Brake/EPB > Trouble Codes
Result
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Proceed to
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DTCs are not output
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A
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DTCs are output
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B
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A
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|
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2.
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VEHICLE OPERATION CHECK
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(a) With the wheels not contacting the ground, check the condition of the rear wheels when the electric parking brake is operating and not operating.
Click here
Result
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Proceed to
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Lock and release operation is normal and parking brake indicator light turns off or blinks (red)
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A
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Lock and release operation is malfunctioning and parking brake indicator light illuminates (red) or turns off according to switch operation
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B
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Lock and release operation is malfunctioning and parking brake indicator light turns off or blinks (red)
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C
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B |
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INSPECT REAR BRAKE
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A
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|
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3.
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INSPECT COMBINATION METER ASSEMBLY
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(a) Perform the Active Test of the combination meter assembly using the GTS.
Body Electrical > Combination Meter > Active Test
Tester Display
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Indicat. Park
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(b) Check the combination meter assembly.
OK:
Parking brake indicator light (red) turns on or off in accordance with GTS operation.
4.
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CHECK HARNESS AND CONNECTOR (+BS TERMINAL VOLTAGE)
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(a) Turn the power switch off.
(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Condition
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Specified Condition
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A51-30 (+BS) - Body ground
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Always
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11 to 14 V
|
|
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*a
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Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))
|
|
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
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|
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5.
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CHECK HARNESS AND CONNECTOR (IGR TERMINAL VOLTAGE)
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(a) Turn the power switch off.
(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Condition
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Specified Condition
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A51-36 (IGR) - Body ground
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Power switch on (IG)
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11 to 14 V
|
|
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*a
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Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))
|
|
|
NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|