Brake Pedal Position Switch Signal Circuit Troubleshooting

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 POSITION SWITCH TEST ).
2. NO -Go to step 2.
Press the brake pedal.
Do the brake lights come on?
1. YES -Go to step 4.
2. NO -Go to step 3.
Inspect the STOP (20A) 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 STOP (20A) fuse. Inspect the brake pedal position switch (see BRAKE PEDAL POSITION SWITCH TEST ). Go to step 4.
2. NO -Repair short in the wire between the PCM (A32) and the STOP (20A) fuse. Replace the STOP (20A) fuse. Go to step 4.
Measure voltage between PCM connector terminals A32 and B20 with the brake pedal pressed.

Fig 1: Measuring Voltage Between PCM Connector Terminals A32 & B20
Courtesy 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 PCM (A32) and the brake pedal position switch.