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)MAINTENANCEPROCEDURESMAINTENANCE INFORMATIONFUSES & CIRCUIT BREAKERSFUSE PANEL IDENTIFICATION (1983-89 FIREBIRD)FUSE & CIRCUIT BREAKER IDENTIFICATION
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39
Fuse & Circuit Breaker Identification
1991 Pontiac Firebird Formula, 5.0 F, Standard, M39SECTION Fuse & Circuit Breaker Identification
- 1 - 10 Amp (Red) - Computer Command Control
- 2 - 10 Amp (Red) - Fuel Pump, Oil Pressure Switch, Electric Cluster (1987-89)
- 3 - 3 Amp (Violet) - Crank Signal To ECM
- 4 - 20 Amp (Yellow) - Choke Heater (Engine Code H) (1983-87), Cooling Fan Relay (Engine Codes F & S)
- 5 - 20 Amp (Yellow) - Turn Signal Lights, Back-Up Lights
- 6 - Blank (1983-86), 20 Amp (Red) - MPFI Injectors (Engine Codes F & S)
- 7 - 20 Amp (Yellow) - Parking Lights, Side Marker Lights, Taillights
- 8 - 25 Amp (White) - Heater &/Or Air Conditioner
- 9 - 10 Amp (Red) - Audio Alarm System, Computer Command Control (1983-86), Vehicle Speed Sensor (1987-89), TCC Brake Switch, Cruise Control, A/C Relay, Gauges, Rear Window Defogger
- 10 - Blank (1983-86), 20 Amp (Yellow) - MPFI Injectors (Engine Codes F & S)
- 11 - 20 Amp (Yellow) - Glove Box Light, Cigarette Lighter, Hatchback Lid Release, Horn Relay, Interior Lights, Power Antenna, Power Door Locks, Radio/Digital Clock, Computer Command Control
- 12 - 5 Amp (Tan) - Instrument Panel Lights
- 13 - 10 Amp (Red) - Radio
- 14 - 25 Amp (White) - Windshield Wiper/Washer
- 15 - 35 Amp (Circuit Breaker) - Power Windows, Rear Wiper/Washer
- 16 - 35 Amp (Circuit Breaker) - Power Door Locks, Power Seats, Rear Window Defogger
- 17 - 20 Amp (Yellow) - Stoplight Switch, Hazard Flasher, Chime
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.