ELECTRONICALLY CONTROLLED BRAKE SYSTEM > Brake Control Warning Light does not Come ON

for Preparation Click here


DESCRIPTION

The skid control ECU is connected to the combination meter via CAN communication.

WIRING DIAGRAM

Refer to Brake Control Warning Light Remains ON (Click here).

INSPECTION PROCEDURE

NOTICE:
When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve (Click here).

1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if a CAN communication system DTC is output (Click here).

    Result:

    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B



B
INSPECT CAN COMMUNICATION SYSTEM (Click here)
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BRAKE WARNING LIGHT / YELLOW (MINOR MALFUNCTION))

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Select the Active Test on the intelligent tester (Click here).

    ABS/VSC/TRC 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    ECB* Warning Light
    		Brake warning light / yellow (minor malfunction)
    		Warning light ON/OFF
    		Observe combination meter
    *: Electronically Controlled Brake System

  1. Check that the brake warning light / yellow (minor malfunction) on the combination meter turns on or off in accordance with the intelligent tester operation.

    OK:
    The brake warning light / yellow (minor malfunction) turns on or off in accordance with the intelligent tester operation.


    Result:

    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (Click here).



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
Go to step 3
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)  

3.INSPECT COMBINATION METER

  1. Turn the power switch off.

  1. Perform the Active Test of the combination meter (meter CPU) using the intelligent tester (Click here).

  1. Check the combination meter.

    OK:
    The brake warning light / yellow (minor malfunction) turns on or off in accordance with the intelligent tester operation.


    Result:

    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (Click here).



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE COMBINATION METER (Click here)
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)