Alfa Romeo 156 (2003 – 2006) – fuse box diagram
Year of production: 2003, 2004, 2005, 2006
Fuse and relays in the main fusebox
| Relay | Description |
| A | Dipped beam light relay |
| B | Relay for sunroof , seat heater, rear window power control, seat electric adjustment |
Fuses above the main fusebox
Fuses and relays accessible from the glovebox
Fuse and relays in engine bay
| Relay | Description |
| A | Engine radiator cooling fan 2nd speed relay (T.SPARK versions) |
| B | Engine radiator cooling fan 1st speed relay |
| C | Fuel pump relay |
| D | Electronic injection relay |
| E | Climate control compressor relay |
| F | Timing variator relay (1.6 T.SPARK only) or engine radiator fan 2nd speed relay (only 2.5 V6 24V, JTD and JTD 16V Multijet versions) |
| G | Fuel oil heater relay (only Diesel versions) |
For JTD 20v Multijet version
For Diesel versions, depending on the options installed, there is a second bracket fastened to the engine compartment rear bulkhead for the following fuses.
| Relay | Description | ||
| A | MAXI-FUSE | 30A | Additional passenger compartment heater 2nd level relay |
| B | MAXI-FUSE | 30A | Additional passenger compartment heater 1st level relay |
Fuse summary table
| Lights | Fuse | Ampere rating [A] | Location |
| Left front side light | 7 | 10 | Main fusebox |
| Right front side light | 6 | 10 | Main fusebox |
| Left rear side light | 6 | 10 | Main fusebox |
| Right rear side light | 7 | 10 | Main fusebox |
| Left dipped-beam headlamp/Xenon lamps (optional) | 8 | 20 | Main fusebox |
| Right dipped-beam headlamp/Xenon lamps (optional) | 4 | 20 | Main fusebox |
| Left main-beam headlamp | 2 | 20 | Main fusebox |
| Right main-beam headlamp | 1 | 10 | Main fusebox |
| Cruise Control (optional) | 13 | 10 | Main fusebox |
| Left number plate light | 7 | 10 | Main fusebox |
| Right number plate light | 6 | 10 | Main fusebox |
| Reversing lights/Sound system | 13 | 10 | Main fusebox |
| Left rear fog guard | 7 | 10 | Main fusebox |
| Right rear fog guard | 6 | 10 | Main fusebox |
| Direction indicators – Hazard warning lights | 14 | 10 | Main fusebox |
| Fog lamps | 16 | 15 | Above main fusebox |
| Car interior and glovebox lights | 12 – 13 | 10 | Main fusebox |
| HI-FI BOSE system | 9 | 25 | Above main fusebox |
| Services | Fuse | Ampere rating [A] | Location |
| Windscreen wiper, windscreen washer/Rearscreen wiper/Rain sensor (optional) | 10 | 20 | 69 |
| Horns | 11 | 20 | 69 |
| GSM Box for Connect/Navigator-electronic warning system | 13 | 10 | 69 |
| Front power windows | 5 | 30 | 69 |
| Left rear power window | 4 | 20 | 71 |
| Right rear power window | 5 | 20 | 71 |
| Door locking system – Boot light | 3 | 20 | 69 |
| Boot electric opening | 7 | 30 | 71 |
| Rearscreen heating | 15 | 30 | 69 |
| Wing mirror adjustment | 13 | 10 | 69 |
| Wing mirror defrosting | 15 | 30 | 69 |
| Cigar lighter/Odour sensor | 9 | 15 | 69 |
| Headlamp washer | 1 | 20 | 72 |
| Headlamp aiming device | 4 | 10 | 69 |
| Instrument cluster | 12 | 10 | 69 |
| Main-beam headlamp warning light | 2 | 10 | 69 |
| Rearscreen heating warning light | 15 | 30 | 69 |
| Sound system/Diagnosis socket | 12 | 10 | 69 |
| Electronic alarm system | 12 | 10 | 69 |
| Supplementary electrical socket in the boot (Sportwagon versions) | 10 | 20 | 71 |
| Remote control | 13 | 10 | 69 |
| Controls lighting/Stop lights | 3 | 10 | 71 |
| Rear control lighting from sidelights | 6 | 10 | 71 |
| Seat heating/Sunroof/Seat electrical adjustment | 8 | 30 | 71 |
| Air bag system | 2(*) | 10(*) | 71 |
| ABS system | 9 | 60 | 68 |
| 11(*) | 10(*) | 71 | |
| Alfa Romeo CODE system | 13 | 7,5 | 71 |
| Climate control system | 9 | 15 | 69 |
| Engine cooling radiator fan: | |||
| First speed: | |||
| – T.SPARK and JTS versions | 6 | 50 | 68 |
| – diesel versions | 6 | 60 | 68 |
| – 2.5 V6 24V versions | 6 | 40 | 68 |
| Second speed | |||
| – T.SPARK and JTS versions | 7 | 30 | 68 |
| – diesel versions | 7 | 40 | 68 |
| – 2.5 V6 24V versions | 7 | 40 | 68 |
| Passenger compartment fan (petrol versions) | 1 | 40 | 68 |
| Passenger compartment fan (diesel versions) | 4 | 40 | 68 |
| Electronic ignition and injection system | 13 | 7,5 | 71 |
| 14 | 15 | 71 | |
| 15 | 15 | 71 | |
| 5 | 30 | 68 | |
| Glow plugs and resistances on fuel oil filter (diesel versions) | 8 | 70 | 68 |
| Fuel oil heater (JTD versions, JTD 16V Multijet) | H | 25 | 74 |
| Services switched off with starting | 1 | 7,5 | 71 |
| Battery power supply for Alfa Romeo CODE/Injection system | 12 | 7,5 | 71 |
| (+15) key-controlled service supply (ignition switch) | 2 | 30 | 68 |
| General service supply (petrol versions) | 4 | 80 | 68 |
| General service supply (diesel versions) | 1 | 80 | 68 |
| General service supply | 3 | 70 | 68 |
| Additional heater (diesel version only) | 10 | 70 | 68 |
| Oil pump supply (Selespeed versions only) | 10 | 30 | 68 |
| Selespeed gearbox (2.0 JTS version) | 7 | 30 | 68 |
| 8 | 20 | 68 | |
| Automatic gearbox (2.5 V6 24V version) | 7 | 40 | 68 |
| 8 | 20 | 68 | |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.