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 MANUALSPONTIAC1987GRAND PRIX LE, 5.0 HREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSDEFOGGER - REAR WINDOWTESTINGSWITCH TESTCALAIS & GRAND AM
1987 Pontiac Grand Prix LE, 5.0 H
Calais & Grand Am
1987 Pontiac Grand Prix LE, 5.0 HSECTION Calais & Grand Am
- Turn control switch on. Check that the indicator light comes on and check that grid gets hot. Wait 10 minutes. Indicator light should go off. Turn control switch on again. Check that the indicator light goes off after 5 minutes.
- Turn control switch on once more. Check that indicator light comes on and immediately turn switch off. Check that indicator light goes off and that grid cools down.
- Check "ACC" circuit breaker by operating power door locks. Check gauge fuse by watching instrument panel warning lights. If problem involves time that defogger operates, replace control switch.
- Remove connector from control switch and defogger timer/relay. Check Lt. Blue, Orange/Black and Pink/Black wire terminals for battery voltage. If voltage is incorrect, check circuit for that terminal.
- If voltage is correct, disconnect negative battery cable and measure Black and Black/White wire resistance to ground. Resistance reading must be one ohm or less for Black wire, 2 ohms or less for Black/White wire. If resistance is incorrect, check defogger grid. If the voltage and resistance are correct, replace control switch.
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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.