2012 Honda Fit Base, Automatic TransFACTORY OEM SERVICE PROCEDURE

Brake Pedal Position Switch Signal Circuit Troubleshooting

  1. Turn the ignition switch to ON (II).
  2. Check the BRAKE SWITCH in the DATA LIST with the HDS.

    Does it indicate OFF? 

    YES:  Go to step  3.

    NO:  Inspect the brake pedal position switch (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT ).

  3. Press the brake pedal, and check the BRAKE SWITCH in the DATA LIST with the HDS.

    Does it change to ON? 

    YES:  The brake pedal position switch signal circuit (BKSW line) is OK.

    NO:  Go to step  4.

  4. Turn the ignition switch to LOCK (0).
  5. Jump the SCS line with the HDS.
  6. Disconnect the brake pedal position switch 4P connector.
  7. Disconnect ECM/PCM connector A (49P).
  8. Check for continuity between ECM/PCM connector terminal A42 and body ground.
    Fig 1: Checking Continuity Between ECM/PCM Connector Terminal A42 & Body Ground
    G05953103Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES:  Repair short in the wire between the ECM/PCM (A42) and the brake pedal position switch. Also, replace the No. 24 STOP/HORN (10 A) fuse.

    NO:  Go to step  9.

  9. Connect brake pedal position switch 4P connector terminal No. 2 to body ground with a jumper wire.
    Fig 2: Connecting Brake Pedal Position Switch 4P Connector Terminal No. 2 To Body Ground With Jumper Wire
    G05953104Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check for continuity between ECM/PCM connector terminal A42 and body ground.
    Fig 3: Checking Continuity Between ECM/PCM Connector Terminal A42 & Body Ground
    G05953105Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES:  Repair open or short in the wire between the brake pedal position switch and the No. 24 STOP/HORN (10 A) fuse. Also, inspect the brake pedal position switch (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT ).

    NO:  Repair open in the wire between the ECM/PCM (A42) and the brake pedal position switch.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.