VEHICLE STABILITY CONTROL SYSTEM Brake Warning Light Remains ON

DTC Code DTC Name
Brake Warning Light Remains ON

DESCRIPTION

The brake warning light comes on when brake fluid is insufficient, the parking brake is applied or EBD control is defective.

If the amount of brake fluid in the master cylinder reservoir is insufficient, DTCs related to the brake fluid are stored.

WIRING DIAGRAM

C216820E07

CAUTION / NOTICE / HINT

Note:

When replacing the master cylinder solenoid, perform calibration (Click here).

PROCEDURE

  1. CHECK DTC

    1. Check for DTCs.

      Click here

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B

      Chassis > ABS/VSC/TRC > Trouble Codes

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    Click here

    A

  2. CHECK CAN COMMUNICATION LINE

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus.

      Click here

      OK

      CAN Bus Check indicates no malfunctions in CAN communication.

      Result

      Result

      OK

      NG
    NG

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

    Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER (PARKING BRAKE SW)

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Parking Brake SW

      Parking brake switch

      ON or OFF

      ON: Parking brake applied

      OFF: Parking brake released

      -

    6. Using the intelligent tester, check the input of the switch operation when the parking brake pedal is operated.

      OK

      When the parking brake is operated, the display changes as shown above.

      Result

      Result

      OK

      NG
    NG

    INSPECT PARKING BRAKE SWITCHClick here

    OK

  4. READ VALUE USING INTELLIGENT TESTER (BRAKE WARNING LIGHT)

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Brake Warning Light

      Brake warning light

      ON or OFF

      ON: Warning light on

      OFF: Warning light off

      -

    6. When performing the Brake Warning Light Active Test, check Brake Warning Light in the Data List.

      Click here

      Chassis > ABS/VSC/TRC > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Brake Warning Light

      Brake warning light

      Warning light ON/OFF

      Observe the combination meter.

      Result

      Result

      Proceed to

      Data List Display

      Data List Display when Performing Active Test ON/OFF Operation

      ON

      Changes between ON and OFF

      A

      Does not change between ON and OFF

      B

      OFF

      Changes between ON and OFF

      A

      Does not change between ON and OFF

      B
    A

    GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

    Click here

    B

    REPLACE MASTER CYLINDER SOLENOID

    Click here

  5. INSPECT PARKING BRAKE SWITCH

    1. Disconnect the A39 parking brake switch connector.

    2. C215408C01

      *a

      Component without harness connected

      (Parking Brake Switch)

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      1 - Body ground

      Parking brake applied

      (Switch pin not pushed in)

      Below 1 Ω

      Parking brake released

      (Switch pin pushed in)

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPLACE PARKING BRAKE SWITCH ASSEMBLY

    Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH - MAIN BODY ECU)

    1. Disconnect the A39 parking brake switch connector.

    2. Remove the main body ECU (multiplex network body ECU).

      Click here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A39-1 - A-12 (PKB)

      Always

      Below 1 Ω

      A39-1 - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR