VEHICLE STABILITY CONTROL SYSTEM ABS Warning Light Remains ON

DESCRIPTION

When one of the following conditions is met, the ABS warning light remains on:


WIRING DIAGRAM

A01DYW6E03

INSPECTION PROCEDURE

Note


  • After replacing the brake actuator assembly, perform calibration Click here.

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

  • Before disconnecting the connector, make sure that there are no problems with the connection.

  • After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.

PROCEDURE


  1. CHECK FOR DTC


    1. Turn the ignition switch off.

    2. Check if DTCs for the ABS are output Click here.

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

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


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

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  3. CHECK TERMINAL VOLTAGE (IG1 TERMINAL)


    1. Turn the ignition switch off.

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

    3. A01DW3AE58
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      S35-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    1. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S35-1 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)


    1. Turn the ignition switch off.

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

    3. Disconnect the C25 combination meter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S35-10 (WA) - C25-38 Always Below 1 Ω
      S35-10 (WA) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK TERMINAL VOLTAGE (EXI3 TERMINAL)


    1. A01DW3AE62
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

      Turn the ignition switch off.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      S35-28 (EXI3) - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      NG w/ Rear Differential Lock A
      w/o Rear Differential Lock B
      OK C

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ABS WARNING LIGHT) Click here

    A

  7. CHECK HARNESS AND CONNECTOR (EXI3 TERMINAL CIRCUIT)


    1. Turn the ignition switch off.

    2. Disconnect the rear differential lock position switch (No. 4 transfer indicator switch) connector.

    3. Disconnect the rear differential lock ECU (No. 2 4 wheel drive control ECU) connector.

    4. Disconnect the skid control ECU (brake actuator assembly) connector.

    5. Disconnect the C26 combination meter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S35-28 (EXI3) - T31-2 Always Below 1 Ω
      S35-28 (EXI3) - C26-9 Always Below 1 Ω
      S35-28 (EXI3) - F23-1 (RLP) Always Below 1 Ω
      S35-28 (EXI3) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT DIFFERENTIAL LOCK SYSTEM


    1. Inspect rear differential lock system Click here.


    NG

    GO TO DIFFERENTIAL SYSTEM (PROBLEM SYMPTOMS TABLE) Click here

    OK

  9. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ABS WARNING LIGHT)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      ABS Warning Light ABS warning light Warning light ON / OFF Observe the combination meter.

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

      ABS/VSC/TRC
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      ABS Warning Light

      ABS warning light /

      ON or OFF

      ON: ABS warning light on

      OFF: ABS warning light off

      		 -
      Result
      Result Proceed to
      Data List Display Data List Display When Performing Active Test ON/OFF Operation
      ON Does not change between ON and OFF for LHD A
      Does not change between ON and OFF for RHD B
      Changes between ON and OFF C
      OFF Does not change between ON and OFF for LHD A
      Does not change between ON and OFF for RHD B
      Changes between ON and OFF C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

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

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here