2004 Honda Insight StandardFACTORY OEM SERVICE PROCEDURE

Brake Pedal Position Switch Signal Circuit Troubleshooting

  1. Check the brake lights.

    Are the brake lights on without pressing the brake pedal? 

    1. YES  -Inspect the brake pedal position switch (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH/IDLE STOP SWITCH ADJUSTMENT ).
    2. NO  -Go to step 2.
  2. Press the brake pedal.

    Do the brake lights come on? 

    1. YES  -Go to step 3.
    2. NO  -Go to step  4.
  3. Measure voltage between ECM connector terminals A32 and B20 with the brake pedal pressed.
    Fig 1: Measuring Voltage Between ECM Connector Terminals A32 And B20
    G03680976Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage ? 

    1. YES  -The brake pedal position switch signal is OK.
    2. NO  -Repair open in the wire between the ECM (A32) and the brake pedal position switch.
  4. Inspect the No. 6 (10 A) fuse in the under-hood fuse/relay box.

    Is the fuse OK ? 

    1. YES  -Repair open in the wire between the brake pedal position switch and the No. 6 (10 A) fuse. Inspect the brake pedal position switch (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH/IDLE STOP SWITCH ADJUSTMENT ).
    2. NO  -Repair short in the wire between the ECM (A32) and the No. 6 (10 A) fuse. Replace the No. 6 (10 A) fuse.
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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.

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