ANTI-LOCK BRAKE SYSTEM Brake Warning Light Remains ON

DESCRIPTION

The brake actuator assembly (skid control ECU) is connected to the combination meter via CAN communication.

If any of the following is detected, the brake warning light remains on:


WIRING DIAGRAM

A005IB8E03

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly (skid control ECU) or deceleration sensor, be sure to perform deceleration sensor 0 point calibration and CVT oil pressure calibration after performing AT/CVT learned values initialization.

    for K310 Click here

    for K411 Click here

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Perform the test mode procedure after the initialization (perform the test mode start only after the brake actuator assembly (skid control ECU) is replaced).

    Tech Tips

    By performing the test mode start, the identification code of the brake actuator assembly (skid control ECU) is re-registered.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output Click here.

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

    B

    CHECK CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


    1. Check if the brake actuator assembly (skid control ECU) connector is securely connected.

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  3. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 1ND-TV) B
      NG (for 1NZ-FE) C
      NG (for 1NR-FE) D

    B

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    D

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    A

  4. CHECK TERMINAL VOLTAGE (IG1)


    1. Disconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.

    2. Turn the ignition switch to ON.

    3. A005JYBE01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to Brake actuator assembly (Skid control ECU) )

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

      Standard Voltage
      except LHD with CVT
      Tester Connection Switch Condition Specified Condition
      A55-34 (IG1) - Body ground Ignition switch ON 11 to 14 V
      for LHD with CVT
      Tester Connection Switch Condition Specified Condition
      A57-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  5. CHECK HARNESS AND CONNECTOR (GND1)


    1. Turn the ignition switch off.

    2. Disconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.

    3. A005JMHE01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to Brake actuator assembly (Skid control ECU) )

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

      Standard Resistance
      except LHD with CVT
      Tester Connection Condition Specified Condition
      A55-1 (GND1) - Body ground Always Below 1 Ω
      for LHD with CVT
      Tester Connection Condition Specified Condition
      A55-1 (GND1) - Body ground Always Below 1 Ω

    4. Reconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  6. READ VALUE USING INTELLIGENT TESTER (PARKING BRAKE SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

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

      ABS/VSC/TRC
      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

      		 -

    4. 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.

    NG

    INSPECT PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

  7. INSPECT BRAKE FLUID LEVEL WARNING SWITCH


    1. A005JHYE01
      Text in Illustration
      *a

      Component without harness connected

      (Brake Fluid Level Warning Switch)

      Turn the ignition switch off.

    2. Remove the reservoir filler cap and strainer.

    3. Disconnect the brake fluid level warning switch connector.

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

      Tech Tips

      A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Switch OFF (Float up) 10 kΩ or higher
      Switch ON (Float down) Below 1 Ω

      Tech Tips

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

    5. Reconnect the brake fluid level warning switch connector.

    6. Reinstall the reservoir filler cap and strainer.

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

    B

    REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH) Click here

    C

    REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH) Click here

    A

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE FLUID LEVEL WARNING SWITCH)


    1. Disconnect the F1 combination meter assembly connector and the A25 brake fluid level warning switch.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F1-12 (SW) - A25-1 Always Below 1 Ω
      A25-1 - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F1-12 (SW) - Body ground Always 10 kΩ or higher

    3. Reconnect the F1 combination meter assembly connector and the A25 brake fluid level warning switch.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Perform Active Test of the combination meter assembly using the intelligent tester Click here.

      OK
      The brake warning light turns ON or OFF in accordance with the intelligent tester.
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

      Tech Tips

      Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter assembly.


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    A

  10. REPLACE COMBINATION METER ASSEMBLY


    1. Turn the ignition switch off.

    2. Replace the combination meter assembly Click here.


    NEXT

  11. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Perform Active Test of the combination meter assembly using the intelligent tester Click here.

      OK
      The brake warning light turns ON or OFF in accordance with the intelligent tester.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  12. INSPECT PARKING BRAKE SWITCH ASSEMBLY


    1. Remove the parking brake switch assembly.


    2. Inspect the parking brake switch assembly.


      Result
      Result Proceed to
      OK A
      NG (for Pedal Type) B
      NG (for Lever Type) C

    B

    REPLACE PARKING BRAKE SWITCH ASSEMBLY Click here

    C

    REPLACE PARKING BRAKE SWITCH ASSEMBLY Click here

    A

  13. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - PARKING BRAKE SWITCH)


    1. Disconnect the 3A or 3C instrument panel junction block assembly connector and the F22 or A26 parking brake switch assembly connector.

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

      Standard Resistance (Check for Open)
      except 1NZ-FE
      Tester Connection Condition Specified Condition
      3A-28 (PKB) - F22-1 Always Below 1 Ω
      for 1NZ-FE
      Tester Connection Condition Specified Condition
      3C-30 (PKB) - A26-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      except 1NZ-FE
      Tester Connection Condition Specified Condition
      3A-28 (PKB) - Body ground Always 10 kΩ or higher
      for 1NZ-FE
      Tester Connection Condition Specified Condition
      3C-30 (PKB) - Body ground Always 10 kΩ or higher

    3. Reconnect the 3A or 3C instrument panel junction block assembly connector and the F22 or A26 parking brake switch assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  14. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the main body ECU from the instrument panel junction block assembly.

    2. Disconnect the 3A or 3C instrument panel junction block assembly connector.

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

      Standard Resistance
      except 1NZ-FE
      Tester Connection Condition Specified Condition
      3A-28 - 12 (PKB) Always Below 1 Ω
      3A-28 - Body ground Always 10 kΩ or higher
      for 1NZ-FE
      Tester Connection Condition Specified Condition
      3C-30 - 12 (PKB) Always Below 1 Ω
      3C-30 - Body ground Always 10 kΩ or higher

    4. Reconnect the 3A or 3C instrument panel junction block assembly connector.

    5. Reinstall the main body ECU to the instrument panel junction block assembly.

      Result
      Result Proceed to
      OK A
      NG (for Pedal Type) B
      NG (for Lever Type) C

    A

    REPLACE MAIN BODY ECU

    B

    REPLACE PARKING BRAKE SWITCH ASSEMBLY Click here

    C

    REPLACE PARKING BRAKE SWITCH ASSEMBLY Click here