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 AND BRAKE PEDAL POSITION SWITCH/IDLE STOP SWITCH ADJUSTMENT ).
2. NO -Go to step 2.
Press the brake pedal.
Do the brake lights come on?
1. YES -Go to step 3.
2. NO -Go to step 4.
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
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 ECM (A32) and the brake pedal position switch.
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.