Smart Forfour (2014 – 2018) Fuse Box Diagrams & Location
The Smart Forfour fuse box protects the vehicle’s electrical systems from overloads and short circuits. This blog covers the fuse box location and diagrams for Smart Forfour models from 2014 to 2018, helping you find fuse positions, ratings, and protected components when checking or replacing a fuse.
Fuse Box Location
Passenger Compartment Fuse Box
The fuse box is located in the glove box, behind the cover.
Engine Compartment Fuse Box
Rear Fuse/Relay Module
The Rear Fuse/Relay Module is located behind the trim panel on the left side of the luggage compartment, near the rear tailgate.
Fuse Box Diagrams
Passenger Compartment Fuse Box
| № | Description | Amp |
|---|---|---|
| 1 | Rear roof rack electrical connection | 20 |
| 2 | Spare | — |
| 3 | Spare | — |
| 4 | Spare | — |
| 5 | Driver-side SAM control unit | 25 |
| 6 | Driver-side SAM control unit | 25 |
| 7 | Driver-side SAM control unit | 25 |
| 8 | Centre SAM control unit Radio Radio over connector sleeve for terminal 15 R |
15 |
| 9 | Spare | — |
| 10 | Horn | 15 |
| 11 | Battery sensor and driver-side SAM control unit | 5 |
| 12 | Front cigarette lighter with ashtray illumination | 15 |
| 13 | Spare | — |
| 14 | Internal combustion engine: Automatic transmission protected through connector sleeve for circuit 30 Diagnostic connector, electric vehicle: Fused circuit 30 connector sleeve Diagnostic connector |
20 |
| 15 | Supply for fused circuit 30 connector sleeve | 15 |
| 16 | Internal combustion engine Motor electronics protected through connector sleeve for circuit 30Electric vehicle: Supply for fused circuit 30 connector sleeve |
5 |
| 17 | Supply protected through connector sleeve for circuit 30 | 15 |
| 18 | Brake lights switch | 10 |
| 19 | Outside mirror adjustment switch | 5 |
| 20 | Transponder coil Electronic Stability Program control unit and brake light switch Protected through connector sleeve for circuit 30 |
3 |
| 21 | Light functions protected through connector sleeve for circuit 30 | 10 |
| 22 | Steering wheel angle sensor Dual-clutch transmission control unit |
5 |
| 23 | Spare | — |
| 24 | Centre SAM control unit | 15 |
| 25 | Centre SAM control unit | 10 |
| 26 | Centre SAM control unit | 15 |
| 27 | Centre SAM control unit | 20 |
| 28 | Driver-side SAM control unit | 10 |
| 29 | Driver-side SAM control unit | 10 |
| 30 | Combination switch Alarm siren Supply for fused circuit 30 connector sleeve (Electric vehicle) |
15 |
| 31 | Instrument cluster and additional instruments | 10 |
| 32 | Spare | — |
| 33 | Supplemental Restraint System control unit | 5 |
| 34 | Combination switch | 5 |
| 35 | Electrical power steering control unit | 5 |
| 36 | Centre SAM control unit | 5 |
| 37 | Driver-side SAM control unit | 30 |
| 38 | Air conditioning power supply solenoid switch | 40 |
| 39 | Internal combustion engine Starter, through starter relay |
30 |
| 39 | Electric vehicle: Blower motor |
40 |
| 1/1 | Electric vehicle: Electric vehicle circuit 30 connector sleeve supply |
10 |
| 1/2 | Electric vehicle: Brake booster vacuum pump control unit Power electronics control unit |
— |
| 1/3 | Spare | — |
| 1/4 | Sound system amplifier control unit | 20 |
| 1/5 | Internal combustion engine: Dual clutch transmission control unit Electric vehicle: Electric drive control unit |
5 |
| 1/6 | Left front power window motor and right front power window motor | 25 |
| 1/7 | Left electrically adjustable and heated outside mirror and right electrically adjustable and heated outside mirror | 5 |
| 1/8 | Electric vehicle: Front passenger seat heater control unit Driver seat heater control unit |
25 |
| 1/9 | Spare | — |
| 1/10 | Electric vehicle: Steering wheel heater relay | — |
| 2/1 | Supply for soft top control drive unit | 20 |
| 2/2 | Supply for soft top control drive unit | 20 |
| 2/3 | Spare | — |
| 2/4 | Spare | — |
| – | – | |
| Relays | ||
| K1 | Heated rear window/outside mirrors relay | |
| K2 | Front power window relay | |
| K3 | Sliding roof relay | |
| K4 | Front headlamps relay | |
| K5 | Starter relay | |
| K6 | Fanfare horn relay | |
| K | Electric vehicle: Steering wheel heater relay |
Engine Compartment Fuse Box
Main Fuses (Battery Clamp)
| № | Description | Amp |
|---|---|---|
| F1 | Internal combustion engine: Electrical fuse 3A (F108f3A) and electrical fuse 3B (F108f3B)Electric vehicle: Power supply fuse and relay module (F1) DC/DC converter control unit |
200 |
| F2A | Vehicle interior fuse and relay module supply (F2) Protected through connector sleeve for circuit 30 Connector sleeve for circuit 30 |
70 |
| F2B | Electrical power steering control unit | 60 |
| F3A | Vehicle interior fuse and relay module supply (F2) Ignition lock Protected through connector sleeve for circuit 30 Connector sleeve for circuit 30 |
70 |
| F3B | Electronic Stability Program control unit | 50 |
Fuse/Relay Module
Internal Combustion Engine
| № | Description | Amp |
|---|---|---|
| 1 | Internal combustion engine relay module | Diode |
| 2 | Supply for vacuum pump relay (for USA) | Diode |
| 3 | Fuel pump with fill level sensor and temperature sensor | 20 |
| 4 | Supply for fused circuit 30 connector sleeve | 25 |
| 5 | Supply for connector sleeves for circuit 87 | 15 |
| 6 | Refrigerant compressor relay | 15 |
| 7 | Fan Through fan relay |
10 |
| 8 | Dual clutch transmission control unit | 10 |
| – | – | |
| Relays | ||
| K1 | Engine function circuit 87 relay | |
| K2 | Fan relay | |
| K3 | Ignition coils/fuel pump actuation relay | |
| K4 | – |
Electric Vehicle
| № | Description | Amp |
|---|---|---|
| 1 | Spare | – |
| 2 | Transmission mode recognition sensor Electric drive control unit |
15 |
| 3 | Electric vehicle drive motor fan relay | 40 |
| 4 | Battery cooling system coolant pump relay | 30 |
| 5 | Battery cooling system coolant pump | 15 |
| 6 | Valid for electric vehicle: Battery management system control unit Electric drive control unit |
5 |
| 7 | Power electronics control unit power supply connector sleeve supply | 20 |
| 8 | Circuit 87 supply connector sleeve | 15 |
| – | – | |
| Relays | ||
| K1 | Engine function circuit 87 relay | |
| K2 | Fan relay | |
| K3 | Ignition coils/fuel pump actuation relay | |
| K4 | Battery cooling system coolant pumps relay |
Rear Fuse/Relay Module
| № | Description | Amp |
|---|---|---|
| 1 | Heated rear window over relay for heated rear window/outside mirrors | 30 |
| 2 | Internal combustion engine: Front passenger seat heater control unit Driver seat heater control unit Electric vehicle: Brake booster vacuum pump control unit |
30 |
| 3 | Supply for Electronic Stability Program control unit | 25 |
| 4 | Electric vehicle: Spare Electrical fuse 1 and electrical fuse 2 |
40 |
| 4 | Internal combustion engine: Sliding roof relay |
25 |
| 5 | Supply for internal combustion engine fuse and relay module | 60 |
| 6 | Internal combustion engine: Dual clutch transmission control unit Protected through connector sleeve for circuit 30 |
50 |
| 6 | Electric vehicle: Vehicle interior fuse and relay module supply | 40 |
| 7 | Fan motor Over fan relay |
30 |
| 7 | Fan solenoid switch ICE combustion engine cooling |
30 |
| 8 | Spare | — |
| 9 | Internal combustion engine: Secondary air injection pump (for USA)Electric vehicle: Heater for high-voltage battery Overheater relay for high-voltage battery |
60 |
| K1 | Fan relay |
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