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HOMESERVICE MANUALSPONTIAC1987FIERO BASE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSDEFOGGER - REAR WINDOWTESTINGSWITCH TESTCAMARO, FIERO & FIREBIRD
1987 Pontiac Fiero Base, Automatic

Camaro, Fiero & Firebird

1987 Pontiac Fiero Base, AutomaticSECTION Camaro, Fiero & Firebird
  1. Remove control switch from behind instrument panel. Leave switch connected to wire harness. Turn ignition on. Check Orange/Black & Pink/Black wires for 12 volts. Black & Purple/White wire should have zero volts. Lt. Blue wire (Firebird only) should also have zero volts. Turn control switch on. Check that indicator light comes on. Release control switch. Indicator light should stay on.
    NOTE: On Camaro and Fiero, check the voltages in step 2) at defogger control switch. On Firebird, check the voltages in step 2) at defogger timer/relay.
  2. Check Orange/Black and Pink/Black wire for 12 volts, Purple/White wire for 11 volts and Black wire for zero volts. Lt. Blue wire (Firebird only) should also have zero volts. Check Black wire at right side of grid for zero volts. Check that voltage at middle of grid is 5-7 volts. Check Black wire at left side of grid for 10 volts.
RENDER: 1.0x

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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.