Brake Hold Standby Indicator Light Circuit [09/2022 - ]: Procedure

1. If the brake hold standby indicator light does not illuminate even though the brake hold switch (No. 3 combination switch assembly) 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
   • Hybrid control system

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check if CAN communication system DTCs are output.

   Refer to DIAGNOSIS SYSTEM [09/2022 - ]

   Result

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

Result: 

B 

INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

Result: 

A 

See step  3

1. Check if the skid control ECU (brake booster with master cylinder assembly) connector is securely connected.

   OK

   The connector is securely connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTOR TO BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY CORRECTLY 

Result: 

OK 

See step  4

1. Turn the power switch off.
2. Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream.

   Refer to DATA LIST / ACTIVE TEST [08/2021 - ]

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Brake Hold Indicator

3. Check the combination meter assembly.

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

Result: 

OK 

See step  5

1. Select the Active Test on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [06/2018 - ]

   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 assembly

   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

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 BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

Result: 

B 

See step  6

1. Turn the power switch off.
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.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of shift position indicator connector	*b	Front view of wire harness connector (to No. 3 Combination Switch Assembly Side Connector)
   *c	Front view of wire harness connector (to Vehicle Side Connector)	-	-

3. Disconnect the G160 and z28 shift position indicator connectors.
4. Check both the connector case and the terminals 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
   G160-11 (+B) - z28-4 (+B)	Always	Below 1 Ω
   G160-11 (+B) or z28-4 (+B) - Body ground and other terminals	Always	10 kΩ or higher
   G160-8 (E) - z28-2 (E)	Always	Below 1 Ω
   G160-8(E) or z28-2(E) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SHIFT POSITION INDICATOR. Refer to  DISASSEMBLY [09/2022 - ] 

Result: 

OK 

See step  7

1. Inspect the No. 3 combination switch assembly.

   Refer to INSPECTION [06/2018 - ]

   OK

   The No. 3 combination switch assembly is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 3 COMBINATION SWITCH ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

Result: 

OK 

See step  8

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 A45 skid control ECU (brake booster with master cylinder assembly) connector.
3. Check both the connector case and the terminals 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
   A45-20 (CSW2) - G160-11 (+B)	Always	Below 1 Ω
   A45-20 (CSW2) or G160-11 (+B) - Body ground	Always	10 kΩ or higher
   G160-8 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. 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.
2. Check that the lights illuminate when the driver side door is opened.

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

INSPECT LIGHTING SYSTEM (COURTESY LIGHT SWITCH CIRCUIT). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

Result: 

OK 

See step  10

1. 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 Booster with Master Cylinder Assembly))

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A45-24 (CTY) - Body ground	Driver door open	Below 1.5 V
   A45-24 (CTY) - Body ground	Driver door closed	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (CTY CIRCUIT)