Electric Parking Brake does not Operate [08/2021 - ]: Procedure

1. Check if CAN communication system DTCs are output.

   Chassis > Electric Parking Brake > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ] 

Result: 

A 

See step  2

1. With the wheels not contacting the ground, check the condition of the rear wheels when the electric parking brake is operating and not operating.

   Refer to ON-VEHICLE INSPECTION [08/2021 - 07/2022] , or refer to ON-VEHICLE INSPECTION [07/2022 - ]

   Result

   Result	Proceed to
   Lock and release operation is normal and parking brake indicator light turns off or blinks	A
   Lock and release operation is malfunctioning and parking brake indicator light illuminates or turns off according to switch operation	B
   Lock and release operation is malfunctioning and parking brake indicator light turns off or blinks	C

Result: 

B 

INSPECT REAR BRAKE 

Result: 

C 

See step  4

Result: 

A 

See step  3

1. Perform the Active Test of the combination meter assembly using the Techstream.

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Park Warning

2. Check the combination meter assembly.

   OK

   Parking brake indicator light turns on or off in accordance with Techstream operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022]  , or refer to  REMOVAL [07/2022 - ] 

Result: 

NG 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2022 - ] 

1. Turn the power switch off.
2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

   OK

   The connector is securely connected.

3. Disconnect the A48 parking brake ECU (brake actuator assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

4. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

5. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A48-9 (BEPB) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Turn the power switch off.
2. Disconnect the A48 parking brake ECU (brake actuator assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A48-26 (IG) - Body ground	Power switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022]  , or refer to  REMOVAL [07/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR