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)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSPOWER DOOR LOCKSTROUBLE SHOOTINGSYSTEM OPERATION CHECK
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39
System Operation Check
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39SECTION System Operation Check
- Use the SYSTEM CHECKS table, as a guide to normal operation.
- If problem exists, see SYMPTOM INDEX table under SYSTEM TESTS.
SYSTEM CHECKS
| Action | Normal Result |
|---|---|
| Operate Left Door Lock Switch | All Doors Lock & Unlock |
| Operate Right Door Lock Switch | All Doors Lock & Unlock |
| With All Doors Closed & Locked, Operate Inside Door Handle To Try To Open Each Door | The Doors Will Not Open |
| Open Left Door & Move Left Door Lock Switch To LOCK Position, Close Door, & Try To Open Each Door From Outside | The Doors Will Not Open |
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.