Electric Parking Brake does not Operate [11/2023 - ]: Procedure

1. Check if CAN communication system DTCs are output.

   Chassis > Brake/EPB > 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 [11/2023 - ] 

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 [12/2019 - ]

   Result

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

Result: 

B 

INSPECT REAR BRAKE 

Result: 

C 

See step  6

Result: 

A 

See step  3

1. Check the vehicle specification.

   Result

   Result	Proceed to
   Combination Meter Assembly (except 12.3 Inch Display)	A
   Combination Meter Assembly (for 12.3 Inch Display)	B

Result: 

B 

See step  5

Result: 

A 

See step  4

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

   Refer to DATA LIST / ACTIVE TEST [11/2023 - ]

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Park Warning

2. Check the combination meter assembly.

   OK

   Parking brake indicator light (red) turns on or off in accordance with GTS operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

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

   Refer to DATA LIST / ACTIVE TEST [11/2023 - ]

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Multi Display All (White)

2. Check the combination meter assembly.

   OK

   The multi-information display in the combination meter assembly turns on according to the operation of the Active Test.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

1. Turn the ignition switch off.
2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A39-14 (+BS) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Turn the ignition switch off.
2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A39-45 (IG1) - Body ground	Ignition switch ON	11 to 14 V*1 10.5 to 16 V*2

   *1: w/o Stop and Start System

   *2: w/ Stop and Start System

   Result

   Result	Proceed to
   OK	A
   NG (w/o Stop and Start System)	B
   NG (w/ Stop and Start System)	C

Result: 

A 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [11/2023 - ] 

Result: 

B 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

C 

INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT). Refer to  Backup Boost Converter Circuit [11/2023 - ]