VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1429

DTC Code DTC Name
C1429 Open or Short in Brake Pedal Load Sensing Switch

DESCRIPTION

The brake pedal load sensing switch operates when the brake pedal is depressed with a force exceeding a predetermined level.

The skid control ECU (brake actuator assembly) detects if the brake pedal is depressed or not via this circuit.

DTC Code DTC Detection Condition Trouble Area
C1429 An open or short in the brake pedal load sensing switch continues for 0.3 seconds or more.

  • Brake pedal load sensing switch (Brake with switch pedal sub-assembly)

  • Brake pedal load sensing switch circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A01E1ECE10

INSPECTION PROCEDURE

Note


  • After replacing the brake actuator assembly, perform calibration Click here.

  • Before disconnecting the connector, make sure that there are no problems with the connection.

  • After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.

Tech Tips

When DTC C1425 is output together with DTC C1429, inspect and repair the trouble areas indicated by DTC C1425 first Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (BRAKE PEDAL LOAD SENSING SW)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

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

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Brake Pedal Load Sensing SW Brake pedal load sensing switch / ON or OFF

      ON: Brake pedal depressed beyond specified point

      OFF: Brake pedal not depressed beyond specified point

      		 -

    6. Check that the brake pedal load sensing switch display observed on the intelligent tester changes according to the brake pedal operation.

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

    NG

    INSPECT BRAKE PEDAL LOAD SENSING SWITCH Click here

    OK

  2. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Depress the brake pedal several times.

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

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

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH

    A01DWLAE02
    Text in Illustration
    *1 Brake Pedal Load Sensing Switch *2 Brake with Switch Pedal Sub-assembly
    *a

    Component without harness connected

    (Brake Pedal Load Sensing Switch)

    		 *b Brake Pedal Released (Closed)
    *c Brake Pedal Depressed (Open) - -

    Note


    • Do not remove the brake pedal load sensing switch from the brake with switch pedal sub-assembly.

    • When there is a malfunction in the brake pedal load sensing switch, replace the brake with switch pedal sub-assembly.


    1. Turn the ignition switch off.

    2. Disconnect the brake pedal load sensing switch (brake with switch pedal sub-assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - 1 Brake pedal depressed 950 to 1050 Ω
      Brake pedal released 203 to 223 Ω

    NG

    REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE PEDAL LOAD SENSING SWITCH)


    1. Turn the ignition switch off.

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

    3. Disconnect the brake pedal load sensing switch (brake with switch pedal sub-assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S35-27 (FSW+) - B8-2 Always Below 1 Ω
      S35-27 (FSW+) - Body ground Always 10 kΩ or higher
      B8-1 - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK for LHD B
      for RHD C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR