Mod Description
Covers Fortwo & Forfour in all ICE engine and electric driver formats.Mod Details
PremiumNo Difficulty
Mod ID1075
Creditevilution
For
Linkhttps://www.evilution.co.uk/mod/453-fuses-petrol.htm Copy to ClipboardW453 (Forfour) & C453 (Fortwo)
Main Fuse Box F2 (Hand Book Layout)
In the owners manual, the fuses are labelled sensibly as below. (see the bottom of the page for smart’s workshop guide WIS fuse layout).
| Fuse Number | Function | Amp Rating | Power State | Wire Colour |
| 1 | Centre SAM control unit | 5A | Switched | Brown |
| 2 | Power steering control unit | 5A | Switched | Brown |
| 3 | Lighting control unit | 5A | Permanent | Brown |
| 4 | Airbag | 5A | Switched | Brown |
| 5 | ||||
| 6 | Instrument cluster | 10A | Red | |
| 7 | Horn, alarm system | 15A | Blue | |
| 8 | Driver side SAM | 10A | Red | |
| 9 | Driver side SAM | 10A | Red | |
| 10 | Centre SAM | 20A | Yellow | |
| 11 | Indicators | 15A | Blue | |
| 12 | Centre SAM | 10A | Red | |
| 13 | Centre SAM | 15A | Blue | |
| 14 | 30A | Green | ||
| 15 | ESP | 5A | Brown | |
| 16 | Interior lighting, Heater controls, Electric Windows | 10A | Red | |
| 17 | Immobiliser, Brake light switch | 3A | Violet | |
| 18 | Electric adjustable mirrors | 5A | Brown | |
| 19 | Brake lights | 10A | Red | |
| 20 | Parking aid, headlight adjusters, lane keep assist, steering wheel | 15A | Blue | |
| 21 | ECU | 5A | Brown | |
| 22 | Rear window wiper | 15A | Blue | |
| 23 | Starter motor | 30A | Permanent | Green |
| 24 | Central locking | 40A | Permanent | Orange |
| 25 | Front windscreen wipers | 30A | Permanent | Green |
| 26 | Radio, MFD Screen, Audio Gateway Control, Media Connection Unit A90/5, Media Operating Unit N24, Telematics Unit, OBD Pin 16 | 20A | Permanent | Yellow |
| 27 | ||||
| 28 | 12v socket, cigarette lighter | 15A | Switched | Blue |
| 29 | SAM-D | 5A | Permanent | Brown |
| 30 | Horn | 15A | Switched | Blue |
| 31 | Additional instruments | 10A | Red | |
| 32 | Central locking | 15A | Switched | Blue |
| 33 | Rear lights, hazard warning button, central locking button, headlamp adjusters, electric windows, licence plate lights, radio, AC controller, cruise control, speed limiter, parking aid button, program selector button, tailgate unlocking, lane keeping assist camera, start/stop button. | 25A | Permanent | Light blue |
| 34 | Headlights, DRL | 25A | Permanent | Light blue |
| 35 | Headlights, DRL | 25A | Permanent | Light blue |
| 36 | ||||
| 37 | ||||
| 38 | ||||
| 39 | Roof rack electrical connection | 20A | Permanent | Yellow |
| 40 | ||||
| 41 | ||||
| 42 | Seat heater control unit | 25A | Light Blue | |
| 43 | Heated wing mirrors and adjusters | 5A | Switched | Brown |
| 44 | Anti-entrapment feature (emergency windows) | 25A | Switched | Light blue |
| 45 | Gearbox control unit | 5A | Switched | Brown |
| 46 | Radio amplifier | 20A | Yellow | |
| 47 | ESP Controller | 25A | Light Blue | |
| 48 | Brake booster pump & Power electronics (electric drive) |
|||
| 49 | Electric vehicle circuit 30 (electric drive) | 10A | Red | |
| 50 | ||||
| 51 | ||||
| 52 | Soft top control drive unit | 20A | Yellow | |
| 53 | Soft top control drive unit | 20A | Yellow |
Switched/Permanent Live Power State
I have documented a load of the power states of the main fuse board. Permanent lives are always powered at 12 volts. Switched lives come on with the ignition.
I haven’t done all of the fuses as it’s a real ball ache and you have enough to choose from if you want to piggyback some fuses for a dash camera etc.
Front Fuse Box (Under Bonnet) F1
Petrol Engine
| Item | Function | Specification |
| Fuse 1 | Heated Rear Window | 30A |
| Fuse 2 | Seat Heater | 30A |
| Fuse 3 | ESP Traction Control | 25A |
| Fuse 4 | Fortwo Main Electrical | 40A |
| Fuse 5 | Combustion Engine & Relay Module F11 | 60A |
| Fuse 6 | Twinamic Auto Gearbox | 50A |
| Fuse 7 | Heating/AC System | 30A |
| Fuse 8 | Unknown | 80A |
| Fuse 9 | Secondary Air Injection Pump (USA) | 60A |
Rear Fuse Box (Behind Offside Boot Panel) F11
Petrol Engine
| Fuse Number | Function | Specification |
| 1 | AC Compressor Clutch | Diode |
| 2 | Vacuum Pump Relay | Diode |
| 3 | Fuel Pump | 20A |
| 4 | Circuit 30 | 25A |
| 5 | Circuit 87, Preheat Air Flap, Purge Control Valve, Variable Camshaft Solenoid, Oil Pump Valve, Secondary Air Injection Valve, Lambda Sensor (x2). | 15A |
| 6 | Air Conditioning | 15A |
| 7 | Fan | 10A |
| 8 | Twinamic Dual Clutch | 10A |
Battery Clamp Fuses (Positive Battery Connection) F108
| Fuse Number | Function | Specification |
| 1 | Feeds Fuse 3A & 3B And Main Cable To Front Fuse Box F1 | 200 Amp |
| 2A | Main Fuse Box F2 | 70 Amp |
| 2B | Power Steering Controller | 60 Amp |
| 3A | Main Fuse Box F2 & Ignition Lock | 70 Amp |
| 3B | ESP Traction Control Unit | 50 Amp |
Smart’s Workshop Guide Fuse Layout
Because smart like to make everyone’s lives hard, their technical documentation (WIS) that the dealer mechanics use don’t number their fuses in the same order as show in the owner’s manual. On their internal documents they number them in reverse. So if you are working from official smart wiring diagrams, use this layout.
| Fuse Number | Function | Amp Rating | Power State | Wire Colour |
| 1 | Roof rack electrical connection | 20A | Permanent | Yellow |
| 2 | – | |||
| 3 | ESP Controller | 25A | Light Blue | |
| 4 | – | |||
| 5 | Headlights, DRL | 25A | Permanent | Light blue |
| 6 | Headlights, DRL | 25A | Permanent | Light blue |
| 7 | Rear lights, hazard warning button, central locking button, headlamp adjusters, electric windows, licence plate lights, radio, AC controller, cruise control, speed limiter, parking aid button, program selector button, tailgate unlocking, lane keeping assist camera, start/stop button. | 25A | Permanent | Light blue |
| 8 | Central locking | 15A | Switched | Blue |
| 9 | Additional instruments | 10A | Red | |
| 10 | Horn | 15A | Switched | Blue |
| 11 | SAM-D | 5A | Permanent | Brown |
| 12 | 12v socket, cigarette lighter | 15A | Switched | Blue |
| 13 | – | |||
| 14 | Radio, MFD Screen, Audio Gateway Control, Media Connection Unit A90/5, Media Operating Unit N24, Telematics Unit, OBD Pin 16 | 20A | Permanent | Yellow |
| 15 | Rear window wiper | 15A | Blue | |
| 16 | ECU | 5A | Brown | |
| 17 | Parking aid, headlight adjusters, lane keep assist, steering wheel | 15A | Blue | |
| 18 | Brake lights | 10A | Red | |
| 19 | Electric adjustable mirrors | 5A | Brown | |
| 20 | Immobiliser, Brake light switch | 3A | Violet | |
| 21 | Interior lighting, Heater controls, Electric Windows | 10A | Red | |
| 22 | ESP | 5A | Brown | |
| 23 | – | 30A | Green | |
| 24 | Centre SAM | 15A | Blue | |
| 25 | Centre SAM | 10A | Red | |
| 26 | Indicators | 15A | Blue | |
| 27 | Centre SAM | 20A | Yellow | |
| 28 | Driver side SAM | 10A | Red | |
| 29 | Driver side SAM | 10A | Red | |
| 30 | Horn, alarm system | 15A | Blue | |
| 31 | Instrument cluster | 10A | Red | |
| 32 | – | |||
| 33 | Airbag | 5A | Switched | Brown |
| 34 | Lighting control unit | 5A | Permanent | Brown |
| 35 | Power steering control unit | 5A | Switched | Brown |
| 36 | Centre SAM control unit | 5A | Switched | Brown |
| 37 | Front windscreen wipers | 30A | Permanent | Green |
| 38 | Central locking | 40A | Permanent | Orange |
| 39 | Starter motor | 30A | Permanent | Green |
| 1/1 or FA1 | Electric vehicle circuit 30 (electric drive) | 10A | Red | |
| 1/2 or FA2 | Brake booster pump & Power electronics (electric drive) |
|||
| 1/3 or FA3 | – | |||
| 1/4 or FA4 | Radio amplifier | 20A | Yellow | |
| 1/5 or FA5 | Gearbox control unit | 5A | Switched | Brown |
| 1/6 or FA6 | Anti-entrapment feature (emergency windows) | 25A | Switched | Light blue |
| 1/7 or FA7 | Heated wing mirrors and adjusters | 5A | Switched | Brown |
| 1/8 or FA8 | Seat heater control unit | 25A | Light Blue | |
| 1/9 or FA9 | – | |||
| 1/10 or FA10 | – | |||
| 2/1 or FB1 | Soft top control drive unit | 20A | Yellow | |
| 2/2 or FB2 | Soft top control drive unit | 20A | Yellow | |
| 2/3 or FB3 | – | |||
| 2/4 or FB4 | – |