VEHICLE STABILITY CONTROL SYSTEM > Brake Warning Light Remains ON

for Preparation Click here


DESCRIPTION

If any of the following is detected, the BRAKE warning light remains on:
  1. The skid control ECU connector is disconnected from the skid control ECU.
  2. The brake fluid level is insufficient.
  3. The parking brake is applied.
  4. The EBD is defective.

WIRING DIAGRAM


C109396E01


INSPECTION PROCEDURE

NOTICE:
When replacing the ABS and TRACTION actuator assembly, perform zero point calibration (Click here).

1.CHECK DTC

  1. Check if the ABS and/or VSC DTC is output (Click here).

    Result:

    Condition
    		Proceed To
    DTC is not output
    		A
    DTC is output
    		B (Click here)



B
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A


2.INSPECT CAN COMMUNICATION SYSTEM

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

    Result:

    Condition
    		Proceed To
    DTC is not output
    		A
    DTC is output
    		B



B
REPAIR CAN COMMUNICATION SYSTEM
A


3.INSPECT MULTIPLEX COMMUNICATION SYSTEM

  1. Check if the multiplex communication system DTC is output (Click here).

    Result:

    Condition
    		Proceed To
    DTC is not output
    		A
    DTC is output
    		B



B
REPAIR MULTIPLEX COMMUNICATION SYSTEM
A


4.INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

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

    OK:
    The connector should be securely connected.



NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


5.INSPECT BATTERY

  1. Check the battery voltage.

    Voltage:
    11 to 14 V



NG
INSPECT CHARGING SYSTEM
OK


6.INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    F049362E22

  1. Disconnect the skid control ECU connector.

  1. Turn the engine switch on (IG).

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A48-46 (IG1) - Body ground
    		Engine switch on (IG)
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT)
OK


7.INSPECT SKID CONTROL ECU (GND TERMINAL)


    F049362E23

  1. Disconnect the skid control ECU connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A48-1 (GND2) - Body ground
    		Below 1 Ω
    A48-32 (GND1) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK


8.INSPECT PARKING BRAKE SWITCH


    C106667E02

  1. Disconnect the parking brake switch connector.

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

    Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A33-1 - Body ground
    		Parking brake switch ON
    (Switch pin free)
    		Below 1 Ω
    A33-1 - Body ground
    		Parking brake switch OFF
    (Switch pin pushed in)
    		10 kΩ or higher



NG
REPLACE PARKING BRAKE SWITCH
OK


9.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO PARKING BRAKE SWITCH)


    I045331E02

  1. Disconnect the skid control ECU connector and parking brake switch.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A48-28 (PKB) - A33-1
    		Below 1 Ω
    A48-28 (PKB) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (PKB CIRCUIT)
OK


10.INSPECT BRAKE FLUID LEVEL WARNING SWITCH


    C106566E02

  1. Remove the reservoir tank cap and strainer.

  1. Disconnect the brake fluid level warning switch connector.

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

    HINT:
    A float is placed inside the reservoir. Its position can be changed by increasing/decreasing the level of brake fluid.

    Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A23-1 - A23-2
    		Float up (Switch OFF)
    		1.9 to 2.1 kΩ
    A23-1 - A23-2
    		Float down (Switch ON)
    		Below 1 Ω

    HINT:
    If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.



NG
REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY
OK


11.INSPECT HARNESS AND CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH TO COMBINATION METER)


    C110921E02

  1. Disconnect the combination meter connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    L31-28 - A23-1
    		Below 1 Ω
    L31-28 - Body ground
    		10 kΩ or higher
    A23-2 - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH CIRCUIT)
OK


12.INSPECT COMBINATION METER ASSEMBLY

  1. Check the combination meter assembly (Click here).

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



NG
REPLACE COMBINATION METER ASSEMBLY
OK

REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY