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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1425

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DTC Code DTC Name
C1425 Open in Stop Light Switch Circuit
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DESCRIPTION

The skid control ECU (brake actuator assembly) receives stop light switch signals and uses them to determine whether or not the brakes are applied.

The skid control ECU (brake actuator assembly) has a detection circuit that it uses to detect an open in the stop light input line.

If the skid control ECU (brake actuator assembly) detects an open in this circuit, it will store this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1425 Open in Stop Light Switch Circuit When IG1 terminal voltage is 9.5 V or more, an open in the stop light switch assembly input line continues for 0.3 seconds or more.

  • Wire harness or connector

  • Stop light switch assembly

  • Skid control ECU (brake actuator assembly)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

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

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PROCEDURE


  1. Click here

    CHECK STOP LIGHT OPERATION


    1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

      OK
      Condition Illumination Condition
      Brake pedal depressed. On
      Brake pedal released. Off
      Result
      Proceed to
      OK
      NG

  2. Click here

    READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Select the Data List using the GTS.

      Click here


      1. Chassis > ABS/VSC/TRC > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Stop Light SW Stop light switch assembly ON or OFF

        ON: Brake pedal depressed

        OFF: Brake pedal released

        		 -



      1. Chassis > ABS/VSC/TRC > Data List
        Tester Display
        Stop Light SW




    4. Check that the stop light switch display observed on the GTS changes according to brake pedal operation.

      OK
      The GTS displays ON or OFF according to brake pedal operation.
      Result
      Proceed to
      OK
      NG

  3. Click here

    RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs.

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      1. Chassis > ABS/VSC/TRC > Clear DTCs


    3. Turn the engine switch off.

    4. Start the engine.

    5. Depress the brake pedal several times to test the stop light circuit.

    6. Check if the same DTC is output.

      Click here


      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Result
      Result Proceed to
      DTC C1425 is not output. A
      DTC C1425 is output. B
      Tip:

      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


  4. Click here

    CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A01VOCNC34
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Turn the engine switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    3. Disconnect the A15 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A15-2 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A15-2 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Tip:

      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

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE BRAKE ACTUATOR ASSEMBLY for LHD:Click here

      REPLACE BRAKE ACTUATOR ASSEMBLY for RHD:Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

  5. Click here

    INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Check the stop light switch assembly.

      Click here

      OK
      The stop light switch assembly is normal.
      Result
      Proceed to
      OK
      NG

  6. Click here

    CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. A01VOCNC34
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the A15 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A15-2 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A15-2 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

  7. Click here

    CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    1. B0066UHC07
      *a

      Front view of wire harness connector

      (to Semiconductor PWR Integration ECU)

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the 2D semiconductor PWR integration ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2D-10 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      2D-10 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

  8. Click here

    RECONFIRM DTC


    1. Reconnect the A15 skid control ECU (brake actuator assembly) connector.

    2. Reconnect the 2D semiconductor PWR integration ECU connector.

    3. Clear the DTCs.

      Click here


      1. Chassis > ABS/VSC/TRC > Clear DTCs


    4. Turn the engine switch off.

    5. Start the engine.

    6. Depress the brake pedal several times to test the stop light circuit.

    7. Check if the same DTC is output.

      Click here


      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Result
      Result Proceed to
      DTC C1425 is not output. A
      DTC C1425 is output. B
      Tip:

      • If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake actuator assembly).

        for LHD:Click here

        for RHD:Click here

      • 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