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 MANUALSPONTIAC1991FIREBIRD FORMULA, 5.0 F, STANDARD, M39REPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEHEADLIGHT DOORS - AUTOMATICTESTINGONE HEADLIGHT DOOR INOPERATIVE
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39
One Headlight Door Inoperative
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39SECTION One Headlight Door Inoperative
- Disconnect HDM 4-pin connector. If headlight doors are stuck in open position, manually close headlight doors.
- To test right headlight door, connect a 15-amp fused jumper between battery positive source and terminal "B" of HDM 4-pin connector (harness side). Ground terminal "A". See Figure .
- If headlight door operates, go to next step. If headlight door does not operate, check wiring harness to headlight door. If harness is okay, replace headlight door motor.
- To test left headlight door, connect a 15-amp fused jumper between battery positive source and terminal "C" of HDM 4-pin connector (harness side). Ground terminal "D".
- If the headlight door operates, refer to, under TESTING, BOTH HEADLIGHT DOORS INOPERATIVE . If headlight door does not operate, check wiring harness to headlight door. If harness is okay, replace headlight door motor.
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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.