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

DESCRIPTION

The brake hold operated indicator light illuminates when the brake hold system is operating (vehicle stopped due to brake fluid pressure hold) and turns off when the brake hold system operation is finished (brake fluid pressure decreases).

The brake hold system may not operate depending on vehicle conditions even when the system is in standby mode and the brake hold standby indicator light is illuminated.

When a malfunction occurs in the brake control system, the brake hold operated indicator light blinks.

CAUTION / NOTICE / HINT

NOTICE:

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) Check that the brake hold standby indicator light operates normally.

(b) If the brake hold operated indicator light does not illuminate although the brake hold standby indicator light is illuminated, check that the following brake hold operation (maintaining brake oil pressure) conditions are met.

HINT:

When a malfunction occurs in the brake control system, the brake hold operated indicator light blinks.

NEXT

2.	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. Hold

(d) Check the combination meter assembly.

OK:

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

NG

INSPECT METER / GAUGE SYSTEM

OK

3.	PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE HOLD OPERATED 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 Operated Light	Brake hold operated 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 Operated Light	Brake hold operated indicator light	ON or OFF	ON: Indicator light on OFF: Indicator light off	-

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

Active Test Display
BH Operated Light

Data List Display
BH Operated Light

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

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

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

USE SIMULATION METHOD TO CHECK