Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Brake Pedal Position Switch Signal Circuit Troubleshooting
- Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
- 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 ).
- 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.
- Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
- Jump the SCS line with the HDS.
- Disconnect the brake pedal position switch 4P connector.
- Disconnect ECM/PCM connector A (49P).
- Check for continuity between ECM/PCM connector terminal A8 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A8) and the brake pedal position switch. Also replace the No. 10 HORN/STOP (20 A) fuse in the under-hood fuse/relay box.
NO - Go to step 9.
- Connect brake pedal position switch 4P connector terminal No. 2 to body ground with a jumper wire.
- Check for continuity between ECM/PCM connector terminal A8 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Repair open in the wire between the brake pedal position switch and the No. 10 HORN/STOP (20 A) fuse in the under-hood fuse/relay box. Also check the brake pedal position switch (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT ).
NO - Repair open in the wire between the ECM/PCM (A8) and the brake pedal position switch.
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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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