VEHICLE STABILITY CONTROL SYSTEM AUTO LSD Indicator Light Remains ON

DESCRIPTION

The AUTO LSD is a system for 2WD vehicles. When the VSC OFF switch (telltale light assembly) is pushed on, the AUTO LSD function is available and the AUTO LSD indicator light illuminates.

Tech Tips

The AUTO LSD does not operate even if the VSC OFF switch (telltale light assembly) is pressed under the following conditions:


  • The TRC/TRAC or VSC system is faulty.

  • The temperature inside the brake actuator assembly increases and the AUTO LSD operation is suspended.

WIRING DIAGRAM

B0029L8E08

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

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.

      for LHD with Central Gateway ECU: Click here

      for RHD with Central Gateway ECU: Click here

      for LHD without Central Gateway ECU: Click here

      for RHD without Central Gateway ECU: Click here

      Result
      Proceed to
      DTC is not output
      DTC is output (for LHD with Central Gateway ECU)
      DTC is output (for RHD with Central Gateway ECU)
      DTC is output (for LHD without Central Gateway ECU)
      DTC is output (for RHD without Central Gateway ECU)

    DTC is output (for LHD with Central Gateway ECU)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is output (for RHD with Central Gateway ECU)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is output (for LHD without Central Gateway ECU)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is output (for RHD without Central Gateway ECU)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is not output

  3. CHECK HARNESS AND CONNECTOR (CSW TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the A100 skid control ECU (brake actuator assembly) connector.

    3. B002A3VC07
      *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 Switch Condition Specified Condition
      A100-33 (CSW) - Body ground VSC OFF switch (telltale light assembly) held on Below 1 Ω
      VSC OFF switch (telltale light assembly) off (Not pressed) 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT TELLTALE LIGHT ASSEMBLY Click here

    OK

  4. READ VALUE USING GTS (AUTO LSD INDICATOR LIGHT)


    1. Reconnect the A100 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.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Auto LSD Indicator Light AUTO LSD indicator light ON or OFF

      OFF: AUTO LSD indicator light off

      ON: AUTO LSD indicator light on

      		 for 2WD

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Auto LSD Indicator Light

    7. Check the GTS display condition of the AUTO LSD indicator light.

      Result
      Proceed to
      Display of the Data List remains OFF
      Display of the Data List remains ON

    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

  5. INSPECT TELLTALE LIGHT ASSEMBLY


    1. Remove the VSC OFF switch (telltale light assembly).

      Click here

    2. Inspect the VSC OFF switch (telltale light assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - TELLTALE LIGHT ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A100-33 (CSW) - G43-6 (+) Always Below 1 Ω
      G43-13 (E) - Body ground Always Below 1 Ω
      A100-33 (CSW) or G43-6 (+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR