ANTI-LOCK BRAKE SYSTEM ABS 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 ABS warning light remains on:


Tech Tips

In some cases, the intelligent tester cannot be used when the brake actuator assembly (skid control ECU) is abnormal.

WIRING DIAGRAM

A005I21E04

CAUTION / NOTICE / HINT

Note

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

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 (GROUND CIRCUIT)

    OK

  6. 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 ABS 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

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    A

  7. REPLACE COMBINATION METER ASSEMBLY


    1. Turn the ignition switch off.

    2. Replace the combination meter assembly Click here.


    NEXT

  8. 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 ABS 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