Civic (D16Y5 Engine With M/T) & Prelude

If brake lights are on without depressing brake pedal, check brake light switch and repair or replace as necessary. If brake lights are not on, depress brake pedal. If brake lights come on, go to next step. If brake lights do not come on, go to step 3.
Using backprobe set, measure voltage between PCM 32-pin connector "A" terminals No. 9 (Brown/Black wire) and PCM 16-pin connector "D" terminal No. 5 (White/Black wire on Prelude or Green/White wire on Civic), with brake pedal depressed. If battery voltage exists, brake switch signal is okay. If battery voltage does not exist, repair open in White/Black wire on Prelude or Green/White wire on Civic between brake switch and PCM 16-pin connector "D". See WIRING DIAGRAMS article.
Check brake switch fuse. See BRAKE SWITCH FUSE IDENTIFICATION table. Fuse is located in under-hood fuse/relay box. If fuse is okay, repair open in White/Black wire on Prelude or White/Green wire on Civic between brake switch fuse and brake switch. If wire is okay, check brake switch adjustment. See ADJUSTMENTS in appropriate DISC & DRUM article in BRAKES. Adjust or replace brake switch as necessary. If fuse is not okay, repair short in White/Black wire on Prelude or White/Green wire on Civic wire between brake switch fuse and brake switch. See WIRING DIAGRAMS article. Repair as necessary.

BRAKE SWITCH FUSE IDENTIFICATION