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 MANUALSHONDA2001CIVIC EX, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSREAR WINDOW DEFOGGER & MIRROR DEFOGGERSYSTEM TESTSFUNCTIONAL TESTSPRELUDE
2001 Honda Civic EX, 4D Sedan, Standard
Functional Tests: Prelude
2001 Honda Civic EX, 4D Sedan, StandardSECTION Prelude
- Turn ignition and rear window defogger switch on. Using DVOM, check for voltage between defogger positive wire terminal and body ground. See Figure. If voltage is not present, go to next step. If voltage is present, go to step 3.
- Check the following:
- Faulty defogger relay. See DEFOGGER RELAY under COMPONENT TESTS.
- Faulty defogger switch. See DEFOGGER SWITCH under COMPONENT TESTS.
- Faulty window antenna coil. See ANTENNA COIL under COMPONENT TESTS.
- Open circuit in Black/Green wire between rear window defogger relay and window antenna coil. See WIRING DIAGRAMS .
Repair circuits or replace components as necessary and retest defogger system.
- Using DVOM, check for continuity between defogger negative wire terminal and body ground. If continuity exists, go to next step. If continuity does not exist, check the following:
- Open circuit in Black wire between rear window defogger and antenna coil.
- Faulty window antenna coil. See ANTENNA COIL under COMPONENT TESTS.
Repair circuit or replace components as necessary.
- Connect DVOM positive lead to center of each defogger grid wire. Connect DVOM negative lead to defogger negative wire terminal. See Figure. If reading is about 6 volts, defogger grid wire is okay. If reading is greater than 6 volts, an open exists between center of defogger grid wire and negative side. If reading is less than 6 volts, an open exists between center of defogger grid wire and positive side. To locate break, move probe along grid wire until meter needle moves abruptly. Repair as necessary. See GRID FILAMENT REPAIR under ON-VEHICLE SERVICE.
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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.