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 (brake pedal support assembly) turns on when the brake pedal is depressed with a force exceeding a predetermined level.

The skid control ECU (brake actuator assembly) uses this circuit to detect if the brake pedal is depressed or not.

DTC No. DTC Detection Condition Trouble Area
C1429 An open or short in the brake pedal load sensing switch circuit continues for 0.3 seconds or more.

  • Brake pedal load sensing switch (Brake pedal support assembly)

  • Brake pedal load sensing switch circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

A01G85ME01

INSPECTION PROCEDURE

Note

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

Tech Tips

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 and/or Click here.

PROCEDURE


  1. READ VALUE USING GTS (BRAKE PEDAL LOAD SENSING SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Select the Data List using the GTS Click here.

      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 a specified point

      OFF: Brake pedal not depressed beyond a specified point

      		 -

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

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

    NG

    INSPECT BRAKE PEDAL SUPPORT ASSEMBLY Click here

    OK

  2. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off.

    4. Start the engine.

    5. Perform a road test.

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

      Result
      Result Proceed to
      DTC C1429 is not output. A
      DTC C1429 is output. B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. INSPECT BRAKE PEDAL SUPPORT ASSEMBLY


    1. A01G5EWE01
      Text in Illustration
      *a

      Component without harness connected

      (Brake Pedal Load Sensing Switch (Brake Pedal Support 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 A32 brake pedal load sensing switch (brake pedal support assembly) connector.

      Note


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

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

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

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

      Switch OFF

      (Brake pedal depressed)

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

      Switch ON

      (Brake pedal released)

      		 203 to 223 Ω
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE BRAKE PEDAL SUPPORT ASSEMBLY Click here

    C

    REPLACE BRAKE PEDAL SUPPORT ASSEMBLY Click here

    A

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE PEDAL SUPPORT ASSEMBLY)


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

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A40-27 (FSW+) - A32-2 (FSW+) Always Below 1 Ω
      A40-27 (FSW+) - Body ground Always 10 kΩ or higher
      A32-1 (FSW-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here