VEHICLE STABILITY CONTROL SYSTEM(for TMC Made), Diagnostic DTC:C1425

DTC Code DTC Name
C1425 Open in Stop Light Switch Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) detects the brake operating conditions through a signal transmitted by the stop light switch.

The skid control ECU (brake actuator assembly) has an open detection circuit, which outputs this DTC when detecting an open in the stop light input line or the ground line of the stop light circuit with the stop light switch off (brake pedal not depressed).

DTC No. DTC Detection Condition Trouble Area
C1425 When IG1 terminal voltage is between 9.5 and 17.4 V, an open stop light switch circuit (A to B, A to body ground) continues for 3 seconds or more.

  • Stop light switch circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A01VL69E01

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly, perform zero point calibration Click here.

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

PROCEDURE


  1. CHECK STOP LIGHT SWITCH 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

    NG

    INSPECT STOP LIGHT CIRCUIT

    OK

  2. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. According to the display on the tester, read the Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch / ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -

    6. Check that the stop light condition observed on the intelligent tester changes according to brake pedal operation.

      OK
      The intelligent tester displays ON or OFF according to brake pedal operation.

    NG

    CHECK TERMINAL VOLTAGE (STP TERMINAL) Click here

    OK

  3. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs Click here.

    3. Start the engine.

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

    5. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC C1425 is not output A
      DTC C1425 is output (for LHD) B
      DTC C1425 is output (for RHD) C

      Tech Tips

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


    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. CHECK TERMINAL VOLTAGE (STP TERMINAL)


    1. A01VELME01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to Skid control ECU)

      Turn the ignition switch off.

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

    3. Disconnect the skid control ECU connector.

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

      Standard Voltage (except LHD with CVT)
      Tester Connection Switch Condition Specified Condition
      A54-2 (STP) - Body ground

      Stop light switch ON

      (Brake pedal depressed)

      		 8 to 14 V

      Stop light switch OFF

      (Brake pedal released)

      		 Below 1.5 V
      Standard Voltage (for LHD with CVT)
      Tester Connection Switch Condition Specified Condition
      A56-2 (STP) - Body ground

      Stop light switch ON

      (Brake pedal depressed)

      		 8 to 14 V

      Stop light switch OFF

      (Brake pedal released)

      		 Below 1.5 V

    5. Reconnect the skid control ECU connector.

      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - STOP LIGHT CIRCUIT)

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here