ANTI-LOCK BRAKE SYSTEM ABS Warning Light Remains ON

DTC Code DTC Name
ABS Warning Light Remains ON

DESCRIPTION

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

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

  • The skid control ECU (brake actuator assembly) connectors are disconnected from the skid control ECU (brake actuator assembly).

  • There is a malfunction in the skid control ECU (brake actuator assembly) internal circuit.

  • There is an open in the harness between the combination meter assembly and the skid control ECU (brake actuator assembly).

  • The ABS control system is defective.

Tip:

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

WIRING DIAGRAM

C283804E02

CAUTION / NOTICE / HINT

Note:

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

  • When replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and CVT oil pressure calibration (for continuously variable transaxle).

    K111:Click here

    K111F:Click here

PROCEDURE

  1. 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.

    Result

    Proceed to

    OK

    NG
    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  2. CHECK CAN COMMUNICATION SYSTEM

    1. Check if CAN communication system DTCs are output.

      Click hereClick hereClick here

    Result

    Proceed to

    DTC is not output

    DTC is output
    DTC is output

    CHECK CAN COMMUNICATION SYSTEM

    Click here

    DTC is not output

  3. INSPECT BATTERY

    1. Check the battery voltage.

      Standard voltage

      11 to 14 V

      Result

      Proceed to

      OK

      NG (for 2AR-FE)

      NG (for 3ZR-FE)
    NG (for 2AR-FE)

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

    Click here

    NG (for 3ZR-FE)

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

    Click here

    OK

  4. CHECK TERMINAL VOLTAGE (IG1 TERMINAL)

    1. C199357C66

      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

      Disconnect the A63 skid control ECU (brake actuator assembly) connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      A63-34 (IG1) - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  5. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

    1. Turn the ignition switch off.

    2. C199357C65

      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A63-1 (GND1) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

    OK

  6. READ VALUE USING GTS (ABS WARNING LIGHT)

    1. Reconnect the A63 skid control ECU (brake actuator assembly) connector.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. According to the display on the GTS, read the Data List.

    7. Check the GTS display condition of the ABS warning light.

      Result

      Proceed to

      Display of the Data List remains OFF

      Display of the Data List remains ON

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Measurement Item

    Range

    Normal Condition

    Diagnostic Note

    ABS Warning Light

    ABS warning light

    OFF or ON

    OFF: Warning light off

    ON: Warning light on

    -

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    ABS Warning Light
    Display of the Data List remains OFF

    INSPECT METER / GAUGE SYSTEM

    Click here

    Display of the Data List remains ON

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here