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

Fuse box diagram (location and assignment of electrical fuses and relays) for Smart Fortwo / Forfour (W453; 2014, 2015, 2016, 2017, 2018-..)

Fuse box diagram: Smart Fortwo / Forfour
(W453; 2014-2018-..)

Passenger Compartment Fuse Box

The fuse box is located in the glove box, behind the cover

Fuse box diagram

Assignment of the fuses and relays in the Passenger Compartment Fuse Box
DescriptionA
1Rear roof rack electrical connection20
2Spare
3Spare
4Spare
5Driver-side SAM control unit25
6Driver-side SAM control unit25
7Driver-side SAM control unit25
8Center SAM control unit
Radio
Radio over connector sleeve for terminal 15 R
15
9Spare
10Horn15
11Battery sensor and driver-side SAM control unit5
12Front cigarette lighter with ashtray illumination15
13Spare
14Internal combustion engine:
Automatic transmission protected through connector sleeve for circuit 30
Diagnostic connector

Electric vehicle:
Fused circuit 30 connector sleeve
Diagnostic connector
20
15Supply for fused circuit 30 connector sleeve15
16Internal combustion engine
Motor electronics protected through connector sleeve for circuit 30

Electric vehicle:
Supply for fused circuit 30 connector sleeve
5
17Supply protected through connector sleeve for circuit 3015
18Brake lights switch10
19Outside mirror adjustment switch5
20Transponder coil
Electronic Stability Program control unit and brake light switch
Protected through connector sleeve for circuit 30
3
21Light functions protected through connector sleeve for circuit 3010
22Steering wheel angle sensor
Dual-clutch transmission control unit
5
23Spare
24Center SAM control unit15
25Center SAM control unit10
26Center SAM control unit15
27Center SAM control unit20
28Driver-side SAM control unit10
29Driver-side SAM control unit10
30Combination switch
Alarm siren
Supply for fused circuit 30 connector sleeve (Electric vehicle)
15
31Instrument cluster and additional instruments10
32Spare
33Supplemental Restraint System control unit5
34Combination switch5
35Electrical power steering control unit5
36Center SAM control unit5
37Driver-side SAM control unit30
38Air conditioning power supply solenoid switch40
39Internal combustion engine
Starter, Through starter relay
30
39Electric vehicle:
Blower motor
40
1/1Electric vehicle:
Electric vehicle circuit 30 connector sleeve supply
10
1/2Electric vehicle:
Brake booster vacuum pump control unit
Power electronics control unit
1/3Spare
1/4Sound system amplifier control unit20
1/5Internal combustion engine:
Dual clutch transmission control unit

Electric vehicle:
Electric drive control unit
5
1/6Left front power window motor and right front power window motor25
1/7Left electrically adjustable and heated outside mirror and right electrically adjustable and heated outside mirror5
1/8Electric vehicle:
Front passenger seat heater control unit
Driver seat heater control unit
25
1/9Spare
1/10Electric vehicle: Steering wheel heater relay
2/1Supply for soft top control drive unit20
2/2Supply for soft top control drive unit20
2/3Spare
2/4Spare
Relays
K1Heated rear window/outside mirrors relay
K2Front power window relay
K3Sliding roof relay
K4Front headlamps relay
K5Starter relay
K6Fanfare horn relay
KElectric vehicle: Steering wheel heater relay

Fuse Box in the engine compartment

Main fuses (Battery clamp)

Main fuses (Battery clamp)
DescriptionA
F1Internal 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
F2AVehicle interior fuse and relay module supply (F2)
Protected through connector sleeve for circuit 30
Connector sleeve for circuit 30
70
F2BElectrical power steering control unit60
F3AVehicle interior fuse and relay module supply (F2)
Ignition lock
Protected through connector sleeve for circuit 30
Connector sleeve for circuit 30
70
F3BElectronic Stability Program control unit50

Fuse/Relay Module

Assignment of the fuses and relays in the Engine Compartment Fuse/Relay Module (Internal combustion engine)
DescriptionA
1Internal combustion engine relay moduleDiode
2Supply for vacuum pump relay (for USA)Diode
3Fuel pump with fill level sensor and temperature sensor20
4Supply for fused circuit 30 connector sleeve25
5Supply for connector sleeves for circuit 8715
6Refrigerant compressor relay15
7Fan
Through fan relay
10
8Dual clutch transmission control unit10
Relays
K1Engine function circuit 87 relay
K2Fan relay
K3Ignition coils/fuel pump actuation relay
K4-
Assignment of the fuses and relays in the Engine Compartment Fuse/Relay Module (Electric vehicle)
DescriptionA
1Spare-
2Transmission mode recognition sensor
Electric drive control unit
15
3Electric vehicle drive motor fan relay40
4Battery cooling system coolant pumps relay30
5Battery cooling system coolant pump15
6Valid for electric vehicle:
Battery management system control unit
Electric drive control unit
5
7Power electronics control unit power supply connector sleeve supply20
8Circuit 87 supply connector sleeve15
Relays
K1Engine function circuit 87 relay
K2Fan relay
K3Ignition coils/fuel pump actuation relay
K4Battery cooling system coolant pumps relay

Rear Fuse/Relay Module

Rear Fuse/Relay Module
DescriptionA
1Heated rear window over relay for heated rear window/outside mirrors30
2Internal combustion engine:
Front passenger seat heater control unit
Driver seat heater control unit

Electric vehicle: 
Brake booster vacuum pump control unit
30
3Supply for Electronic Stability Program control unit25
4Electric vehicle: 
Spare
Electrical fuse 1 and electrical fuse 2
40
4Internal combustion engine:
Sliding roof relay
25
5Supply for internal combustion engine fuse and relay module60
6Internal combustion engine:
Dual clutch transmission control unit
Protected through connector sleeve for circuit 30
50
6Electric vehicle:  Vehicle interior fuse and relay module supply40
7Fan motor
Over fan relay
30
7Fan solenoid switch
ICE combustion engine cooling
30
8Spare
9Internal combustion engine:
Secondary air injection pump (for USA)

Electric vehicle:
Heater for high-voltage battery
Over heater relay for high-voltage battery

60
K1Fan relay
Smart Fortwo / Forfour (W453; 2014-2018-..) fuses and relays December 7, 2018 admin