Brake Hold Standby Indicator Light Circuit [10/2020 - 10/2023]: Procedure

PRE-CHECK

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.

The driver side door is closed.
The driver side seat belt is fastened.
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
Hybrid control system

Result

Proceed to
NEXT

Result:

See step 2

CHECK CAN COMMUNICATION SYSTEM

Check if CAN communication system DTCs are output.

Refer to DIAGNOSIS SYSTEM [10/2020 - 11/2021] , or refer to DIAGNOSIS SYSTEM [11/2021 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023]

Result

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

Result:

INSPECT CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2023]

Result:

See step 3

PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE HOLD STANDBY INDICATOR LIGHT)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).

Select the Active Test on the Techstream.

Refer to DATA LIST / ACTIVE TEST [10/2020 - 10/2023]

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 assembly

Chassis > ABS/VSC/TRAC > Active Test

Tester Display
BH Standby Light

Select the Data List on the Techstream.

Refer to DATA LIST / ACTIVE TEST [10/2020 - 10/2023]

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 > Data List

Tester Display
BH Standby Light

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:

REPLACE SKID CONTROL ECU ASSEMBLY. Refer to REMOVAL [10/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

Result:

See step 4

INSPECT COMBINATION METER ASSEMBLY

Turn the power switch off.

Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream.

Refer to DATA LIST / ACTIVE TEST [10/2020 - 11/2021] , or refer to DATA LIST / ACTIVE TEST [11/2021 - 10/2023]

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

Check the combination meter assembly.

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:

INSPECT METER / GAUGE SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2023]

Result:

See step 5

INSPECT BRAKE HOLD SWITCH

Turn the power switch off.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Component without harness connected (Brake Hold Switch)

Disconnect the A brake hold switch connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A-3 (+B) - A-4 (E)	Switch pushed	Below 1 Ω
A-3 (+B) - A-4 (E)	Switch not pushed	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE BRAKE HOLD SWITCH. Refer to REMOVAL [10/2017 - 10/2022] , or refer to REMOVAL [10/2022 - ]

Result:

See step 6

INSPECT SWITCH WIRE

Disconnect the G7 switch wire.
Disconnect the A brake hold switch connector.

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

Standard Resistance

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

Result

Proceed to
OK
NG

Result:

REPLACE SWITCH WIRE. Refer to REMOVAL [10/2017 - 10/2022] , or refer to REMOVAL [10/2022 - ]

Result:

See step 7

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - SWITCH WIRE)

Disconnect the A12 skid control ECU assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A12-14 (HZRI) - G7-3 (+B)	Always	Below 1 Ω
A12-14 (HZRI) or G7-3 (+B) - Body ground	Always	10 kΩ or higher
G7-6 (E) - Body ground	Always	Below 1 Ω

Result

Proceed to
OK
NG

Result:

REPAIR BRAKE HOLD SWITCH

Result:

See step 8

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY

Turn on the interior lights and check that they illuminate, and then set the switch so that the lights illuminate when the door is opened.

Check that the lights illuminate when the driver side door is opened.

The interior lights illuminate when the driver side door is opened.

Result

Proceed to
OK
NG

Result:

INSPECT LIGHTING SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]

Result:

See step 9

CHECK HARNESS AND CONNECTOR (CTY TERMINAL)

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

*a	Component with harness connected (Skid Control ECU Assembly)

Standard Voltage

Tester Connection	Condition	Specified Condition
A10-14 (CTY) - Body ground	Driver door open	Below 1 V
A10-14 (CTY) - Body ground	Driver door closed	Pulse generation (waveform 1)

Waveform 1 (Reference)

*a	Driver door closed
*b	Driver door open

Item	Content
Tester Connection	A10-14 (CTY) - Body ground
Tool Setting	5 V/DIV., 10 ms./DIV.
Vehicle Condition	Driver door closed → open

Result

Proceed to
OK
NG

Result:

REPLACE SKID CONTROL ECU ASSEMBLY. Refer to REMOVAL [10/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR (CTY CIRCUIT)