Home

Toyota Workshop

GSIC - Global Service Information Center

ELECTRONICALLY CONTROLLED BRAKE SYSTEM > Brake Control Warning Light Remains ON

for Preparation Click here


DESCRIPTION

The skid control ECU is connected to the combination meter via CAN communication.
If the skid control ECU stores a DTC, the brake warning light / yellow (minor malfunction) comes on in the combination meter.

WIRING DIAGRAM


C209425E01


INSPECTION PROCEDURE

NOTICE:
When replacing the brake booster with master cylinder (skid control ECU), perform initialization, calibration of the linear solenoid valve and emergency brake signal learning (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.CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

  1. Check if the skid control ECU connector is securely connected.

    OK:
    The connector is securely connected.



NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


3.CHECK AUXILIARY BATTERY

  1. Check the auxiliary battery voltage.

    Standard Voltage:
    11 to 14 V



NG
CHARGE OR REPLACE AUXILIARY BATTERY
OK


4.INSPECT COMBINATION METER

  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 NO. 3 METER CIRCUIT PLATE (Click here)
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)