Toyota CH-R Service Manual: Brake Hold Standby Indicator Light Circuit

DESCRIPTION

When the brake hold switch (electric parking brake switch assembly) is turned on with the ignition switch turned to ON, the brake hold standby indicator light illuminates when brake hold operation is possible.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

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PROCEDURE

1.

PRE-CHECK

(a) 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.

NEXT

2.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

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

B

CHECK CAN COMMUNICATION SYSTEM

A

3.	CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED

(a) 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.

NG

CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

OK

4.	INSPECT COMBINATION METER ASSEMBLY

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch off.

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

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Body Electrical > Combination Meter > Active Test

Tester Display
Indicat. Brake Hold

(d) Check the combination meter assembly.

OK:

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

NG

INSPECT METER / GAUGE SYSTEM

OK

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

(a) Turn the ignition switch to ON.

(b) Select the Active Test on the Techstream.

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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 ON/OFF	Observe combination meter

(c) Select the Data List on the Techstream.

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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

(d) Check the operating condition of the brake hold standby indicator light when operating it using the Techstream.

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

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

6.	INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

(a) Inspect the electric parking brake switch assembly.

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NG

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

OK

7.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-43 (HZRI) - F67-12 (+B)	Always	Below 1 Ω
A42-43 (HZRI) or F67-12 (+B) - Body ground	Always	10 kΩ or higher
F67-8 (E) - Body ground	Always	Below 1 Ω

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR