The BMW 3-Series E30, specifically the 325i/Convertible, 325is, and 325iX models (US version 1987–1991), embodies the essence of German engineering and driving pleasure. Understanding the fuse box and relay diagrams of these iconic models is essential for maintaining and troubleshooting their intricate electrical systems. This article delves into the locations, functions, and importance of these components, providing insights into the BMW 3-Series E30’s electrical architecture.
(US version 1987–1991) BMW 3-Series E30 (325i/Convertible, 325is, 325iX) 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.
BMW 3-Series E30 (325i/Convertible, 325is, 325iX) US version 1987–1991 fuse assignment
Years: 1987, 1988, 1989, 1990, 1991
Fuse box in engine compartment
The fuse box with spare fuse, fuse removal tool and relays is located on the left wheel arch inside the engine compartment.
| No. | Ampere rating [Amps] | Fuse assignment |
| 1 | 7.5 | Left high beam |
| 2 | 7.5 | Right high beam |
| 3 | 15 | Auciliary fan 196 F (91 C) |
| 4 | 15 | Turn signal, clock light |
| 5 | 30 | Windshiels wiper and washer |
| 6 | 7.5 | Brake lights, cruise control, map reading light |
| 7 | 15 | Horn |
| 8 | 30 | Rear window defroster |
| 9 | 15 | Diagnostic plug, speed-range indicator for automatic transmission |
| 10 | 7.5 | Instruments backup lights, check control |
| 11 | 7.5 | Main and aux. fuel pumps |
| 12 | 7.5 | Radio, booster, instruments |
| 13 | 7.5 | Left low beam |
| 14 | 7.5 | Right low beam |
| 15 | — | Vacant |
| 16 | — | Vacant |
| 17 | 30 | Power sliding roof, windows |
| 18 | 30 | Auxiliary fan 210 F (99 C) |
| 19 | 7.5 | Power outside mirrors, mirro heating |
| 20 | 30 | Blower, air conditioner |
| 21 | 7.5 | Interior lights, radio memory, instrument panel lights, glove box, rechargeable flashlight, clock, trunk light, fasten seat belt gong, ignition key warning gong |
| 22 | 7.5 | Left rear light, front position light left, front side marker left |
| 23 | 7.5 | Right rear light, front position light right, rear side marker, ;icense plate lights |
| 24 | 15 | Hazard warning flasher |
| 25 | — | Vacant |
| 26 | — | Vacant |
| 27 | 30 | Central locking system, door lock heating anti-theft protection, on board computer |
| 28 | 30 | Lighter, power antenna |
| 29 | 7.5 | Left fog light |
| 30 | 7.5 | Right fog light |
Exploring the fuse box and relay diagrams of the BMW 3-Series F30/F31/F34 2012-2018 enhances comprehension of its sophisticated electrical infrastructure. Proper maintenance and understanding of these components are essential for ensuring the vehicle’s reliability, performance, and electrical safety throughout its usage.
