Mercedes-Benz C-Class Fuse Box Locations and Diagrams (2015-2021)
The fourth-generation Mercedes-Benz C-Class (W205), produced from 2015 to 2021, brought advanced technology, refined design, and expanded powertrain options to the compact executive segment. Models include C180, C200, C220, C250, C300, C350, C400, C450, and C63 AMG, each offering a balance of efficiency, luxury, and performance.
In this article, you will find fuse box diagrams for the Mercedes-Benz C-Class W205 for model years 2015, 2016, 2017, 2018, 2019, 2020, and 2021. You will also get detailed fuse layouts, providing information about the assignment of each fuse and relay across various systems in the vehicle.
What This Guide Covers:
Fuse Box Diagrams – Clear illustrations showing the location and numbering of fuses and relays.
Fuse Panel Locations – Information about where each fuse box is located in the car, typically found in the engine compartment, under the dashboard, and in the trunk.
Fuse Assignments – Comprehensive listings of what each fuse and relay controls — from lighting, infotainment, and climate control to safety systems and engine components.
Whether you’re troubleshooting electrical issues or replacing a specific fuse, this guide offers the essential information to maintain and repair the electrical systems of your Mercedes-Benz C-Class (W205) effectively.
The fuse box is located in the engine compartment (left-side), under the cover.Press safety clips (1) on the cover together, remove fuse box cover (2) upwards.
Fuse box diagram
Assignment of the fuses and relay in the engine compartment
№
Fused component
Amp
100
Hybrid: Vacuum pump
40
101
Valid except AMG: Connector sleeve, circuit 87/2
15
101
AMG: Connector sleeve, circuit 87/2
20
102
Valid except AMG: Connector sleeve, circuit 87/1
20
102
AMG: Connector sleeve, circuit 87/1
25
103
Valid except AMG: Connector sleeve, circuit 87/4
15
103
AMG: Connector sleeve, circuit 87/4
20
104
Valid except AMG: Connector sleeve, circuit 87/3
15
104
AMG: Connector sleeve, circuit 87/3
20
105
Valid for transmission 722.9 (except 722.930): Automatic transmission fluid auxiliary oil pump control unit
15
106
Spare
–
107
Valid with engine 274.9: Electric coolant pump
60
108
Static LED headlamp: Right front lamp unit High performance LED, Dynamic LED headlamp: Left front lamp unit, Right front lamp unit
20
109
Wiper motor
30
110
Static LED headlamp: Left front lamp unit
20
110
High performance LED, Dynamic LED headlamp: Left front lamp unit, Right front lamp unit
111
Starter
30
112
Hybrid: Accelerator pedal sensor
15
113
Spare
–
114
AIRmatic compressor
40
115
Left horn and right horn
15
116
Spare
–
117
Spare
–
118
Hybrid: Electronic Stability Program control unit
5
119
Circuit 87 C2 connector sleeve
15
120
Valid except AMG: Circuit 87 C1 connector sleeve
5
120
AMG: Circuit 87 C1 connector sleeve
15
121
Electronic Stability Program control unit
5
122
CPC relay
5
123
Spare
–
124
Spare
–
125
Front SAM control unit
5
126
Powertrain control unit Valid for diesel engine: CDI control unit Valid for gasoline engine: ME-SFI control unit
5
127
Hybrid: Voltage dip limiter
5
128
Left front lamp unit and exterior lights switch
5
129
Hybrid: Starter circuit 50 relay
30
129A
Hybrid: Starter circuit 50 relay
30
Relay
G
Engine compartment circuit 15 relay
H
Starter circuit 50 relay
I
Hybrid: Vacuum pump relay (+)
J
CPC relay
K
Valid for transmission 722.9 (except 722.930): Oil pump relay
The fuse box is located in the luggage compartment (on the right-side), under the floor.Lift the trunk floor upwards, swing cover (1) upwards in the direction of the arrow.
Fuse box diagram
Version 1
Version 2
Assignment of the fuses and relay in the trunk
№
Fused component
Amp
1
Terminal 30 “E1” feed
2
Terminal 30g “E2” feed
400
BlueTEC: AdBlue® control unit
25
401
BlueTEC: AdBlue® control unit
15
402
BlueTEC: AdBlue® control unit
20
403
Valid up to 30.11.2015: Front passenger seat partially electric seat adjustment switch
30
403
Valid as of 01.12.2015: Front passenger seat partially electric seat adjustment switch
25
404
Valid up to 30.11.2015: Driver seat partially electric seat adjustment switch
30
404
Valid as of 01.12.2015: Driver seat partially electric seat adjustment switch
25
405
Spare
–
406
Left front door control unit
30
407
Spare
–
408
W205, S205, V205: Right rear door control unit A205, C205: Rear control unit
30
409
Spare
–
410
Stationary heater radio remote control receiver Antenna changeover switch for telephone and stationary heater
5
411
Left front reversible emergency tensioning retractor
30
412
Hybrid: Battery management system control unit
7.5
413
Trunk lid control control unit
5
414
Tuner unit
5
415
Camera cover control unit Perfume atomizer generator
5
416
Cellular telephone system antenna amplifier/compensator Mobile phone contact plate
7.5
417
360° camera control unit Reversing camera
5
418
Rear seat heater control unit AIRSCARF control unit
5
419
Front passenger seat lumbar support adjustment control unit
5
420
Driver seat lumbar support adjustment control unit
5
421
Spare
–
422
Spare
–
423
Sound system amplifier control unit
5
424
AIR BODY CONTROL Plus control unit Valid for engine 276: Engine sound control unit
15
425
Spare
–
426
Spare
–
427
Spare
–
428
Spare
–
429
Spare
–
430
Spare
–
431
Special-purpose vehicle multifunction control unit
25
432
Special-purpose vehicle multifunction control unit
25
433
Trailer recognition control unit
15
434
Trailer recognition control unit
15
434
AMG: Electric parking brake control unit
30
435
Trailer recognition control unit AMG: Electronic differential control unit
25
436
Trailer recognition control unit
15
437
Trailer recognition control unit
25
438
DC/AC converter control unit
30
439
Taximeter Mirror taximeter
5
439
A205: Rear control unit
25
440
Rear seat heater control unit AIRSCARF control unit
30
441
AIRSCARF control unit
30
442
Fuel system control unit
25
443
Right front reversible emergency tensioning retractor
30
444
Tablet PC electrical connector
15
445
S205: Luggage compartment socket
15
446
Front cigarette lighter with ashtray illumination Vehicle interior power outlet
15
447
Right rear center console socket 12V
15
448
Valid for transmission 722, 725: Park pawl capacitor
10
449
Valid for engine 626: Fuel filter element with integrated heater AMG: Electric parking brake control unit
5
450
Rear SAM control unit
5
451
Fuel system control unit BlueTEC: AdBlue® control unit
5
452
Integrated outer right rear bumper radar sensor Integrated outer left rear bumper radar sensor Center rear bumper radar sensor Outer right rear bumper radar sensor Outer left rear bumper radar sensor
5
453
Left front bumper radar sensor Right front bumper radar sensor COLLISION PREVENTION ASSIST controller unit
5
454
Valid for transmission 722: Fully integrated transmission control unit
7.5
454
Driving school package: Footwell illumination switch Pedal operation monitor switch BlueTEC: AdBlue® control unit
5
455
DC/AC converter control unit
5
456
Front long-range radar sensor DISTRONIC electric controller unit
5
457
Hybrid: Power electronics control unit Battery management system control unit AMG: Electronic differential control unit Active engine mounts control unit
5
458
Rear switching module
5
459
Hybrid: Charger AMG: AMG suspension control unit
5
460
KEYLESS-GO control unit
10
461
FM 1, AM, CL [ZV] and KEYLESS-GO antenna amplifier
