Brake Hold Standby Indicator Light Circuit [12/2017 - 09/2018]: Procedure

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

   HINT: 

   If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.

   • Brake system
   • Electric parking brake system
   • SFI system

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check if CAN communication system DTCs are output.

   Refer to DIAGNOSIS SYSTEM [12/2017 - 09/2018]

   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 [12/2017 - 09/2018] 

Result: 

A 

See step  3

1. Jiggle the skid control ECU (brake actuator assembly) connectors and wire harnesses vertically and horizontally and check the brake hold standby indicator light status.

   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. Connect the Techstream to the DLC3.
2. Turn the engine switch off.
3. Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream.

   Refer to DATA LIST / ACTIVE TEST [12/2017 - 10/2020]

   for Sport Package:

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Brake Hold Indicator

   except Sport Package:

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Multi Display Default Screen

4. Check the combination meter assembly.

   OK

   for Sport Package 

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

   except Sport Package 

   The multi-information display 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 [12/2017 - 10/2023] 

Result: 

OK 

See step  5

1. Turn the engine switch on (IG).
2. Select the Active Test on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [12/2017 - 09/2018]

   Chassis > ABS/VSC/TRAC > Active Test 

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

3. Select the Data List on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [12/2017 - 09/2018]

   Chassis > ABS/VSC/TRAC > 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 > Active Test 

   Active Test Display
   BH Standby Light

   Data List Display
   BH Standby Light

4. 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 [12/2017 - 09/2018] 

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)

2. Disconnect the GG2 brake hold switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   GG2- 3 - GG2- 4	Switch pushed	Below 1 Ω
   GG2- 3 - GG2- 4	Switch not pushed	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  8

Result: 

OK 

See step  7

1. Disconnect the A9 skid control ECU (brake actuator assembly) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A9-3 (PKB) - GG2- 3	Always	Below 1 Ω
   A9-3 (PKB) or GG2- 3 - Body ground	Always	10 kΩ or higher
   GG2- 4 - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2017 - 09/2018] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the G7 switch wire.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Switch Wire
   *a	Front view of wire harness connector(to Vehicle Side Connector)
   *b	Front view of wire harness connector(to Switch Connector)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G7- 3 (+B) - GG2 -3	Always	Below 1 Ω
   G7- 3 (+B) or GG2- 3 - Body ground	Always	10 kΩ or higher
   G7- 6 (E) - GG2- 4	Always	Below 1 Ω
   G7- 6 (E) or GG2- 4 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE HOLD SWITCH. Refer to  REMOVAL [12/2017 - 10/2022] 

Result: 

NG 

REPLACE SWITCH WIRE. Refer to  REMOVAL [12/2017 - 10/2022]