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.
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HOMESERVICE MANUALSHONDA1998CIVIC DX, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTINGIDLE CONTROL SYSTEMBRAKE SWITCH SIGNAL
1998 Honda Civic DX, 2D Coupe, Automatic
Brake Switch Signal
1998 Honda Civic DX, 2D Coupe, AutomaticSECTION Brake Switch Signal
NOTE:
This signal informs PCM when brake pedal is depressed.
- 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, check power feed circuit (including fuse) between brake light switch and fuse box. See WIRING DIAGRAMS article. Repair as necessary.
- Measure voltage between PCM connector terminals A32 and B20 (Accord, CR-V, Oasis & Odyssey) or terminals A9 and D5 (Civic & Prelude). See Figure . If battery voltage exists, brake switch signal is okay. If battery voltage does not exist, repair open in wire between PCM connector terminal B20 (Accord, CR-V, Oasis & Odyssey) or terminal D5 (Civic & Prelude) and brake light switch. See WIRING DIAGRAMS article.
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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.