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 & EQUIPMENTCRUISE CONTROL SYSTEMSTESTINGTEST B (POWER CIRCUIT OPEN TEST)CENTURY, CUTLASS CIERA, CUTLASS CRUISER & 6000 V6 MODELS
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39
Century, Cutlass Ciera, Cutlass Cruiser & 6000 V6 Models
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39SECTION Century, Cutlass Ciera, Cutlass Cruiser & 6000 V6 Models
- Check RADIO fuse. Ensure cruise control module connector terminal "J" is grounded. Disconnect row "E" of multifunction lever connector. See Figure . Turn ignition on. Check for battery voltage at terminal E1 of harness half of connector.
- If battery voltage is present, go to next step. If battery voltage is not present, repair Yellow or Brown/White wire between multifunction lever connector terminal E1 and fuse block. See Figure .
- Place cruise control main switch in ON position. Check continuity between multifunction lever connector terminals E1 and E2 (switch side). See Figure . If continuity is not present, replace multifunction lever.
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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.