Smart Fortwo / Forfour (W453; 2014-2018..) fuses and relays

 

In this article, we consider the third-generation Smart Fortwo and second-generation Smart Forfour (W453), available from 2014 to the present. Here you will find fuse box diagrams of Smart Fortwo / Forfour 2014, 2015, 2016, 2017 and 2018, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Fuse Layout Smart Fortwo / Forfour 2014-2018…


Cigar lighter (power outlet) fuse in the Smart Fortwo / Forfour is the fuse #12 in the Passenger Compartment fuse box.


Passenger Compartment Fuse Box

Fuse box location

The fuse box is located in the glove box, behind the cover.The location of the fuses in the passenger compartment: Smart Fortwo / Forfour (2014-2018)

Fuse box diagram

Instrument panel fuse box diagram: Smart Fortwo / Forfour (2014, 2015, 2016, 2017, 2018)

 

Assignment of the fuses and relays in the Passenger Compartment

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 Center 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 30

Electric 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 Center SAM control unit 15
25 Center SAM control unit 10
26 Center SAM control unit 15
27 Center 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 Center 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

Fuse Box in the engine compartment

Fuse box location

The location of the fuses in the engine compartment: Smart Fortwo / Forfour (2014-2018)

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

Under-hood fuse box diagram: Smart Fortwo / Forfour (2014, 2015, 2016, 2017, 2018)


 

Assignment of the fuses and relays in the Engine Compartment 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

Assignment of the fuses and relays in the Engine Compartment Fuse/Relay Module (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 pumps 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

Rear Fuse/Relay Module (location): Smart Fortwo / Forfour (2014-2018)

Rear Fuse/Relay Module: Smart Fortwo / Forfour (2014, 2015, 2016, 2017, 2018)

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
Over heater relay for high-voltage battery

60
K1 Fan relay


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