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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1429

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

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

The skid control ECU 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 pedal load sensing switch circuit

  • Brake actuator assembly (Skid control ECU)
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

When C1425 and/or C1426 is output together with C1429, inspect and repair the trouble areas indicated by C1425 and/or C1426 first (Click here, orClick here).

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PROCEDURE


  1. Click here

    READ VALUE ON INTELLIGENT TESTER (BRAKE PEDAL LOAD SENSING SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Select the Data List mode on the intelligent tester (Click here).

      Table 1. 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 the specified point

      OFF: Brake pedal not depressed beyond the specified point

      		 -

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

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

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    RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs (Click here).

    3. Start the engine.

    4. Perform the road and braking test.

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

      Result
      Result Proceed to
      DTC (C1429) is not output A
      DTC (C1429) is output B

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    INSPECT BRAKE PEDAL LOAD SENSING SWITCH

    Note:

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

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


    1. Turn the ignition switch off.

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

    3. Disconnect the brake pedal load sensing switch connector.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      2 (FSW+) - 1 (FSW-)

      Brake pedal load sensing switch OFF

      (Brake pedal depressed)

      		 950 to 1050 Ω
      2 (FSW+) - 1 (FSW-)

      Brake pedal load sensing switch ON

      (Brake pedal released)

      		 203 to 223 Ω

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


    1. A017DZWE03

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

    2. Disconnect the skid control ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A24-27 (FSW+) - A21-2 (FSW+) Always Below 1 Ω
      A24-27 (FSW+) - Body ground Always 10 kΩ or higher
      A21-1 (FSW-) - Body ground Always Below 1 Ω

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    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)Click here

  6. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLYClick here

  7. Click here

    REPLACE BRAKE PEDAL SUB-ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH)Click here

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR