VEHICLE STABILITY CONTROL SYSTEM ABS Warning Light Remains ON

DESCRIPTION

The skid control ECU is connected to the combination meter assembly via CAN communication.

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


Tech Tips

In some cases, the Techstream cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM

A01HZJ5E01

INSPECTION PROCEDURE

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 a CAN communication system DTC is output Click here.

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

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


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

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  3. CHECK BATTERY


    1. Check the battery voltage.

      Standard Voltage
      11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FE) B
      NG (for 2AR-FE) C

    B

    CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY Click here

    C

    CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY Click here

    A

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01HZZ3E70
      Text in Illustration
      *A for 2AR-FE (w/o Dynamic Radar Cruise Control System)
      *B for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the skid control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition

      A49-25 (+BS) - Body ground*1

      A94-25 (+BS) - Body ground*2

      		 Always 11 to 14 V

      A49-25 (+BS) - A49-38 (GND1)*1

      A94-25 (+BS) - A94-38 (GND1)*2

      		 Always 11 to 14 V

      A49-28 (IG1) - Body ground*1

      A94-28 (IG1) - Body ground*2

      		 Ignition switch ON 11 to 14 V

      A49-28 (IG1) - A49-38 (GND1)*1

      A94-28 (IG1) - A94-38 (GND1)*2

      		 Ignition switch ON 11 to 14 V

      *1: for 2AR-FE (w/o Dynamic Radar Cruise Control System)

      *2: for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  5. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    1. A01HZZ3E71
      Text in Illustration
      *A for 2AR-FE (w/o Dynamic Radar Cruise Control System)
      *B for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Turn the ignition switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      A49-38 (GND1) - Body ground*1

      A94-38 (GND1) - Body ground*2

      		 Always Below 1 Ω

      *1: for 2AR-FE (w/o Dynamic Radar Cruise Control System)

      *2: for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

    OK

  6. INSPECT COMBINATION METER ASSEMBLY


    1. Reconnect the skid control ECU connector.

    2. Perform an Active Test of the combination meter assembly (meter CPU) using the Techstream Click here.

    3. Check the combination meter assembly.

      OK
      The ABS warning light turns on or off in accordance with the Active Test operation.

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts Click here.


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here