Electric Parking Brake does not Operate [04/2018 - 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 [04/2018 -] 

Result: 

A 

See step  2

1. When the vehicle's tires are lifted off the ground and the Techstream is used to operate the electric parking brake, check the condition of the rear tires.

   Refer to ON-VEHICLE INSPECTION [04/2018 - 08/2021]

   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  5

Result: 

A 

See step  3

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.
6. Read the Data List according to the display on the Techstream.

   Chassis > ABS/VSC/TRAC/EPB > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   PKB Light	Parking brake indicator light (red)	ON or OFF	Vehicle stopped Engine switch on (IG) Parking brake released

   Chassis > ABS/VSC/TRAC/EPB > Active Test 

   Tester Display
   PKB Light

7. Select the Data List on the Techstream.

   Chassis > ABS/VSC/TRAC/EPB > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Parking Brake Light	Parking brake indicator light (red) output signal	OFF, Light or Blink	OFF: Parking brake indicator light (red) turns off Light: Parking brake indicator light (red) illuminates Blink: Parking brake indicator light (red) flashes	-

   Chassis > ABS/VSC/TRAC/EPB > Data List 

   Tester Display
   Parking Brake Light

8. Check the operating condition of the parking brake indicator light (red) when operating it using the Techstream.

   Result

   Result	Proceed to
   Parking brake indicator light (red) in the Data List does not change using the Active Test	A
   Parking brake indicator light (red) in the Data List turns ON/OFF using the Active Test	B

Result: 

A 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

Result: 

B 

See step  4

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

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Indicat. Park

2. Check the combination meter assembly.

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

Result: 

NG 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

1. Turn the engine switch off.
2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A28-36 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR