Brake Pedal Position Switch Signal Circuit Troubleshooting

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2005 Honda S2000, 2004 Honda S2000, 2003 Honda S2000, 2002 Honda S2000, and 2001 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.

Check the brake lights.
Are the brake lights on without pressing the brake pedal?
1. YES - Inspect the brake pedal position switch adjustment (see ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).
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 With Brake Pedal Pressed
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 STOP (2000-2001 models: 10 A, 2002-2005 models: 15 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 STOP (2000-2001 models: 10 A, 2002-2005 models: 15 A) fuse. Inspect the brake pedal position switch (see BRAKE PEDAL POSITION SWITCH TEST ).
2. NO - Repair short in the wire between the ECM (A32) and the STOP (2000-2001 models: 10 A, 2002-2005 models: 15 A) fuse. Replace the STOP (2000-2001 models: 10 A, 2002-2005 models: 15 A) fuse.