The Buick LeSabre, manufactured from 1977 to 1981, embodies Buick’s commitment to comfort and reliability in the full-size sedan segment. Its electrical system includes critical components such as the fuse box and relays.
The fuse box in the Buick LeSabre 1977–1981 houses fuses designed to protect electrical circuits from overloads and short circuits, ensuring the safety of components like headlights, taillights, and power windows. Relays, serving as electrically controlled switches, manage the flow of electricity to systems such as the starter motor, fuel pump, and cooling fans, ensuring efficient operation.
Additional advanced electrical components in the Buick LeSabre of this era include climate control systems, power-adjustable seats, and audio systems. These features rely on a robust electrical infrastructure to enhance comfort, convenience, and entertainment for occupants.
Understanding the layout and function of the fuse box and relays is crucial for maintaining and troubleshooting the Buick LeSabre 1977–1981’s electrical systems. Regular inspection and maintenance of these components help ensure the vehicle’s reliability and performance, maintaining its reputation as a comfortable and dependable sedan in Buick’s lineup.
(1977–1981) Buick LeSabre fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Buick LeSabre 1977–1981 fuse assignment
Year of production: 1977, 1978, 1979, 1980, 1981
Fuse box diagram
| Fuse | [A] | Protected Component |
| 1 | 5 | Instrument illumination, headlight warning and electronic air conditioning |
| 2 | 20 | Electric choke |
| 3 | 5 | Instrument illumination, headlight warning |
| 4 | 30 | Circuit breaker: Power windows and roof, fuel cap lock release |
| 5 | — | — |
| 6 | 25 | Heater, air conditioning, trunk lid release, radio capacitor |
| 7 | 10 | Electronic Control Module |
| 8 | 10 | Diesel engine fuse |
| 9 | 25 | Windshield wiper and washer |
| 10 | 20 | Stop and hazard lights |
| 11 | 20 | Seat belt light and buzzer, trunk ajar, transmission downshift and C-4 or E.S.C. jumper, heated back light relay, map and fuel economy lights, instrument gauges and indicator lights |
| 12 | 20 | Tail, side markers, parking, cornering and license lights, clock radio |
| 13 | 10 | Radio, cruise control |
| 14 | 30 | Circuit breaker: Power seats, door locks, heated rear window feed |
| 15 | 20 | Turn signals and back-up lights |
| 16 | 20 | Cigar lighter, glove box light, speed and key warning buzzer, power antenna, clock radio, clock, pulse wiper, air conditioning |
| 17 | 20 | Dome and sail panel lights, trunk light, reading light, vanity light, headlight on warning, automatic door locks and rear cigar lighter, tailgate ajar |
| 18 | — | — |
| 19 | 10 | Instrument gauges, indicator lights, transmission converter clutch and cruise control |
| 19 | 20 | Electric choke |
| Circuit Breaker: Headlight Circuit — A thermo circuit breaker is incorporated in the headlight switch assembly to protect headlight circuits. Windshield Wiper — Integral with windshield wiper motor. | ||
Conclusion
For owners and enthusiasts of classic Buick LeSabre models from 1977–1981, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Buick’s craftsmanship and innovation in the automotive industry during that era.
