Brake Hold Standby Indicator Light Circuit [04/2018 - 08/2021]: Procedure

1. If the brake hold standby indicator light does not illuminate even though the brake hold switch (electric parking brake switch assembly) is pushed, check that the brake hold function operation conditions are met.
   1. The driver door is closed.
   2. The driver seat belt is fastened.
   3. The system is normal.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check if CAN communication system DTCs are output.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -]

   Result

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

Result: 

B 

CHECK CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

Result: 

A 

See step  3

1. Check if the skid control ECU (brake actuator assembly) connector is securely connected.

   OK

   The connector is securely connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY 

Result: 

OK 

See step  4

1. Turn the engine switch off.
2. Enter the following menus: Body Electrical / Combination Meter / Active Test.
3. Perform the Active Test of the combination meter assembly using the Techstream.

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Brake Hold Indicator

4. Check the combination meter assembly.

   OK

   The brake hold standby indicator light turns on or off in accordance with the Techstream operation.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  5

1. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

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

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   BH Standby Light	Brake hold standby indicator light	Indicator light OFF/ON	Observe combination meter assembly Vehicle condition: Vehicle stopped

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

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   BH Standby Light	Brake hold standby indicator light	ON or OFF	ON: Indicator light on OFF: Indicator light off	-

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

   Active Test Display
   BH Standby Light

   Data List Display
   BH Standby Light

2. Check the operating condition of the brake hold standby indicator light when operating it using the Techstream.

   Result

   Result	Proceed to
   Brake hold standby indicator light in the Data List does not change using the Active Test.	A
   Brake hold standby indicator light in the Data List turns ON/OFF using the Active Test.	B

Result: 

A 

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

Result: 

B 

See step  6

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Brake Hold Switch (Electric Parking Brake Switch Assembly))

2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

   OK

   The connector is securely connected.

3. Disconnect the G24 brake hold switch (electric parking brake switch assembly) connector.
4. Check both the connector case and the terminal for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   8 (+B) - 16 (GND1)	Switch pushed	Below 1 Ω
   8 (+B) - 16 (GND1)	Switch not pushed	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY. Refer to  REMOVAL [04/2018 -] 

Result: 

OK 

See step  7

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

   OK

   The connector is securely connected.

2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
3. Check both the connector case and the terminal for deformation and corrosion.

   OK

   No deformation or corrosion.

4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A28-43 (HZRI) - G24-8 (+B)	Always	Below 1 Ω
   A28-43 (HZRI) or G24-8 (+B) - Body ground	Always	10 kΩ or higher
   G24-16 (GND1) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE 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