Smart Forfour (2004-2006) Fuse Diagram

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Fuse box diagram (fuse layout), location, and assignment of fuses and relays Smart Forfour (W454) (2004, 2005, 2006).

Smart Forfour (2004-2006)

Checking and Replacing Fuses

The electrical fuses in your vehicle serve to switch off malfunctioning power circuits. If a fuse is blown, the components and systems secured by that fuse will stop operating. A blown fuse can be identified by the melted metal strip inside it.

Before replacing fuses:

  • Set the parking brake.
  • Make sure the gear selector lever is in park position P.
  • Turn off all electrical accessories.
  • Turn off the engine.
  • Remove the key from the starter switch.

A blown fuse must be replaced by an appropriate spare fuse (recognizable by its color or the fuse rating given on the fuse) of the amperage recommended in the fuse chart.

  • From the fuse chart determine which fuse belongs to the malfunctioning accessory or component.
  • Remove the respective fuse.
  • Replace the defective fuse with a new one of the same amperage.

If a newly inserted fuse blows again, have the cause determined and rectified at an authorized Smart center.

Notice

  • Only use fuses approved by Smart with the specified amperage for the system in question and do not attempt to repair or bridge a blown fuse this may cause an overload leading to a fire, and/or cause damage to electrical components and/or systems. Contact a smart center if you encounter any electrical problems.
  • Never use a fuse with a higher amperage rating, or any other object, in place of a fuse. This may cause extensive damage and possibly a fire.
  • We recommend always carrying replacement fuses in the vehicle.

Instrument Panel Fuse Box Diagram

The fuse box is located on the driver’s side below the dashboard.

Instrument Panel Fuse Box Location

Instrument Panel Fuse Box Diagram

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Fused functionA
1Interior illumination10
Upper control panel control unit
Left SAM control unit
Rain sensor/light sensor
Instrument cluster
Combination switch
Central gateway control unit
2Left SAM control unit10
3Left standing lamp and taillamp7.5
4Right parking light and taillamp7.5
5Front wiper20
6Vacant-
7Heated outside mirror7.5
8Right high beam10
9Left high beam10
10Horn10
11Fuel pump15
12ENGINE 122.9, 134.9, 135.9:20
   Motor electronics control unit
   Motor relay
   Throttle valve relay
13Trailer hitch socket (13-pin) circuit 3015
14Glass sliding roof20
15Rear window wiper motor15
16Cigarette lighter15
17Rear fog lamp7.5
18Outside mirror adjustment7.5
19ENGINE 639.9:15
   EDG control unit
20ENGINE 639.9:7.5
   EDG control unit
   Fuel pump relay 2
   Motor relay
21Right low beam10
22Left low beam, headlamp range adjustment10
23Front fog lamp10/15
24Diagnostic socket, central locking (up to model year 04)15
25Trailer hitch socket (13-pin) circuit 1515
26Turn signal lights10
27Radio15
28Anti-theft alarm system10
29Manual transmission20
30Diagnostic socket, central locking (as of model year 05)15
31Brake lights15
Stop lamp switch (4-pin)
32AAC [KLA] control and operating unit7.5
33ESP control unit7.5
Steering assist control unit
Restraint systems control unit
34ENGINE 122.9, 134.9, 135.9:10
   Ignition coils
35EDG control unit7.5
Fuel pump relay 1
36Reversing lights7.5
37Rear window heater30
38Heated seats30
39ENGINE 639.9:30
   EDG control unit
40Heater blower40
41Ignition/starter switch40
42Power windows40
Headlamp cleaning system pump
43Engine coolant fan motor40
44Electronic selector lever module control unit (with transmission 717.474, 717.475)40
Relay
APower window relay
BHorn relay
CFuel pump 2 relay
DRear fog lamps relay
EStarter relay
FGasoline/diesel engine relay
GPreexcitation alternator
HFan stage 1 relay
IFog lamp relay
JHeater relay
KFuel pump 1 relay
LTransmission relay
MTrailer hitch bridge
NFree (backup relay)
OFan stage 2 relay
PHeadlamp cleaning system relay
QRear window defroster relay
RHeated seats bridge
SLow beam relay
THigh beam relay
UThrottle valve relay (only with engine 134.910, 135.930/950)

 

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