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Mercede-Benz C-Class w205 (2014 - 2018)- fuse box diagram

avatar Jonathan Yarden May 06, 2021 · 5 min. read

In this article you will find a description of fuses and relays Mercedes-Benz, with photos of block diagrams and their locations. Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.

Year of production: 2014, 2015, 2016, 2017, 2018

Dashboard Fuse Box

Mercedes-Benz C-Class w205 - fuse box diagram - dashoboard

Number A Description
200 50 Front SAM control unit
201 40 Front SAM control unit
202 5 Alarm siren
ATA [EDW]/tow-away protection/interior protection control unit (A205)
203 20 Valid with transmission 716: Electric steering lock control unit
204 5 Diagnostic connector
205 7,5 Electronic ignition lock control unit
206 5 Analog clock
207 15 Climate control control unit
208 7,5 Instrument cluster
209 5 Climate control operating unit
Upper control panel control unit
210 5 Steering column tube module control unit
211 25 AMG: Electronic Stability Program control unit
212 5 as of 01.06.2016: Antenna changeover switch for telephone and stationary heated
213 5 Electronic Stability Program control unit
214 30 AMG: Electric parking brake control unit
215 — Spare
216 7,5 Glove compartment lamp
217 5 Japan version: Dedicated Short-Range Communications control unit
218 7,5 Supplemental Restraint System control unit
219 5 Weight sensing system (WSS) control unit
220 — Spare
Relay
F Relay, circuit 15R

Fuse Box in the Engine Compartment

Mercedes-Benz C-Class w205 - fuse box diagram - engine compartment

Number A Description
100 40 Hybrid: Vacuum pump
101 15 Valid except AMG: Connector sleeve, circuit 87/2
20 AMG: Connector sleeve, circuit 87/2
102 20 Valid except AMG: Connector sleeve, circuit 87/1
25 AMG: Connector sleeve, circuit 87/1
103 15 Valid except AMG: Connector sleeve, circuit 87/4
20 AMG: Connector sleeve, circuit 87/4
104 15 Valid except AMG: Connector sleeve, circuit 87/3
20 AMG: Connector sleeve, circuit 87/3
105 15 Valid for transmission 722.9 (except 722.930): Automatic transmission fluid auxiliary oil pump control unit
106 — Spare
107 60 Valid with engine 274.9: Electric coolant pump
108 20 Static LED headlamp: Right front lamp unit
High performance LED, Dynamic LED headlamp:
Left front lamp unit
Right front lamp unit
109 30 Wiper motor
110 20 Static LED headlamp: Left front lamp unit
High performance LED, Dynamic LED headlamp:
Left front lamp unit
Right front lamp unit
111 30 Starter
112 15 Hybrid: Accelerator pedal sensor
113 — Spare
114 40 AIRmatic compressor
115 15 Left horn and right horn
116 — Spare
117 — Spare
118 5 Hybrid: Electronic Stability Program control unit
119 15 Circuit 87 C2 connector sleeve
120 5 Valid except AMG: Circuit 87 C1 connector sleeve
15 AMG: Circuit 87 C1 connector sleeve
121 5 Electronic Stability Program control unit
122 5 CPC relay
123 — Spare
124 — Spare
125 5 Front SAM control unit
126 5 Powertrain control unit
Valid for diesel engine: CDI control unit
Valid for gasoline engine: ME-SFI control unit
127 5 Hybrid: Voltage dip limiter
128 5 Left front lamp unit and exterior lights switch
129 30 Hybrid: Starter circuit 50 relay
129A 30 Hybrid: Starter circuit 50 relay
Relay
E 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 
L Horn relay
M Wiper park position heater relay
N Circuit 87M relay
O Hybrid: Starter circuit 15 relay
P Valid with engine 274.9: Coolant pump relay
Q Hybrid: Vacuum pump relay (-)
R AIRmatic relay 

Fuse Box in the Front-Passenger Footwell

Mercedes Benz C-Class w205 - fuse box diagram - front passenger footwell

Number A Description
301 5 Hybrid: Pyrofuse via high-voltage disconnect device
302 30 Right front door control unit
303 30 W205, S205, V205: Left rear door control unit
A205, C205: Rear control unit
304 20 alid for transmission 722: Intelligent servo module for DIRECT SELECT
305 30 Driver seat control unit
Driver seat heater control unit
Front seat heater control unit
306 30 Front passenger seat control unit
Front passenger seat heater control unit
Front seat heater control unit
307 5 AMG: Active engine mounts control unit
308 30 USA version: Electric Brake Control electrical connector
309 10 Emergency call system control unit
5 HERMES control unit
Telematics services communications module
310 20 AMG: Active engine mounts control unit
311 10 Booster blower electronic blower regulator
312 10 Overhead control panel control unit
313 10 Hybrid: Power electronics control unit
314 5 AMG: Electronic differential control unit
315 5 Powertrain control unit
Valid for diesel engine: CDI control unit
Valid for gasoline engine: ME-SFI control unit
316 7,5 Supplemental Restraint System control unit
317 30 Panoramic sliding sunroof control module
Sliding roof control module
318 20 Stationary heater control unit
319 5 Hybrid: High-voltage PTC heater
320 25 AIRMATIC control unit
Adaptive damping system control unit
321 5 Japan version: Dedicated Short-Range Communications control unit 
322 20 Head unit 
323 5 Parking system control unit
MF1/1 7,5 Audio/COMAND display
Audio equipment fan motor
MF1/2 7,5 Stereo multifunction camera
Mono multifunction camera
MF1/3 7,5 Rain/light sensor with additional functions
W205, S205, V205: Overhead control panel control unit
MF1/4 7,5 Driver seat control unit
Driver seat heater control unit
Front seat heater control unit
MF1/5 7,5 Front passenger seat control unit
Front passenger seat heater control unit
Front seat heater control unit
MF1/6 7,5 Steering column tube module control unit
MF2/1 5 Left front reversible emergency tensioning retractor
MF2/2 5 Audio/COMAND control panel
Touchpad
MF2/3 5 Right front reversible emergency tensioning retractor
MF2/4 5 Heads-up display
MF2/5 5 Multimedia connection unit
MF2/6 5 Hybrid: Electrical refrigerant compressor
MF3/1 5 Feedback line, terminal 30g, front SAM control unit
MF3/2 5 Radar sensors control unit
MF3/3 — Spare
MF3/4 5 Driver side instrument panel button group 
MF3/5 5 Rear air conditioning operating unit
MF3/6 5 Tire pressure monitor control unit 

Fuse Box in the Trunk

Variant 1

Mercedes Benz C-Class w205 - fuse box diagram - trunk (variant 1)

Variant 2

Mercedes Benz C-Class w205 - fuse box diagram - trunk (variant 2)

1 – Terminal 30 “E1” feed
2 – Terminal 30g “E2” feed

Number A Description
400 25 BlueTEC: AdBlue® control unit
401 15 BlueTEC: AdBlue® control unit
402 20 BlueTEC: AdBlue® control unit
403 30 Valid up to 30.11.2015: Front passenger seat partially electric seat adjustment switch
25 Valid as of 01.12.2015: Front passenger seat partially electric seat adjustment switch
404 30 Valid up to 30.11.2015: Driver seat partially electric seat adjustment switch
25 Valid as of 01.12.2015: Driver seat partially electric seat adjustment switch
405 — Spare
406 30 Left front door control unit
407 — Spare
408 30 W205, S205, V205: Right rear door control unit
A205, C205: Rear control unit
409 — Spare
410 5 Stationary heater radio remote control receiver
Antenna changeover switch for telephone and stationary heater
411 30 Left front reversible emergency tensioning retractor
412 7,5 Hybrid: Battery management system control unit
413 5 Trunk lid control control unit
414 5 Tuner unit
415 5 Camera cover control unit
Perfume atomizer generator
416 7,5 Cellular telephone system antenna amplifier/compensator
Mobile phone contact plate
417 5 360° camera control unit
Reversing camera
418 5 Rear seat heater control unit
AIRSCARF control unit
419 5 Front passenger seat lumbar support adjustment control unit
420 5 Driver seat lumbar support adjustment control unit
421 — Spare
422 — Spare
423 5 Sound system amplifier control unit
424 15 AIR BODY CONTROL Plus control unit
Valid for engine 276: Engine sound control unit
425 — Spare
426 — Spare
427 — Spare
428 — Spare
429 — Spare
430 — Spare
431 25 Special-purpose vehicle multifunction control unit
432 25 Special-purpose vehicle multifunction control unit
433 15 Trailer recognition control unit
434 15 Trailer recognition control unit
30 AMG: Electric parking brake control unit
435 25 Trailer recognition control unit
AMG: Electronic differential control unit
436 15 Trailer recognition control unit
437 25 Trailer recognition control unit 
438 30 DC/AC converter control unit 
439 5 Taximeter
Mirror taximeter
25 A205: Rear control unit 
440 30 Rear seat heater control unit
AIRSCARF control unit
441 30 AIRSCARF control unit
442 25 Fuel system control unit
443 30 Right front reversible emergency tensioning retractor
444 15 Tablet PC electrical connector
445 15 S205: Luggage compartment socket
446 15 Front cigarette lighter with ashtray illumination
Vehicle interior power outlet
447 15 Right rear center console socket 12V 
448 10 Valid for transmission 722, 725: Park pawl capacitor
449 5 Valid for engine 626: Fuel filter element with integrated heater
AMG: Electric parking brake control unit
450 5 Rear SAM control unit 
451 5 Fuel system control unit
BlueTEC: AdBlue® control unit 
452 5 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 
453 5 Left front bumper radar sensor
Right front bumper radar sensor
COLLISION PREVENTION ASSIST controller unit
454 7,5 Valid for transmission 722: Fully integrated transmission control unit
5 Driving school package:
Footwell illumination switch
Pedal operation monitor switch
BlueTEC: AdBlue® control unit
455 5 DC/AC converter control unit 
456 5 Front long-range radar sensor
DISTRONIC electric controller unit 
457 5 Hybrid:
Power electronics control unit
Battery management system control unit
AMG:
Electronic differential control unit
Active engine mounts control unit 
458 5 Rear switching module 
459 5 Hybrid: Charger
AMG: AMG suspension control unit
460 10 KEYLESS-GO control unit 
461 5 FM 1, AM, CL [ZV] and KEYLESS-GO antenna amplifier 
462 40 Sound system amplifier control unit 
463 30 W205, S205, V205: Rear window heater via rear window interference suppression capacitor
A205, C205: Soft top/vehicle interior electrical connector 
464 40 Trunk lid control control unit
Liftgate control control unit
465 40 Rear SAM control unit 
466 40 Rear SAM control unit 
467 40 Valid for engine 626: Fuel filter element with integrated heater
A205: Rear control unit 
Relay
S Vehicle interior circuit 15 relay 
T Rear window heater relay
U 2nd seat row cup holder and sockets relay
V BlueTEC: AdBlue® relay
X 1 st seat row/trunk refrigerator box and sockets relay 
Y Spare relay 
ZR1 Valid for engine 626: Fuel filter heater relay 
ZR2 Reserve relay
ZR3 Reserve relay

Interior prefuse box

Mercedes Benz C-Class w205 - fuse box diagram - interior - prefuse

F32/4k2 – Quiescent current cutout relay

Number A Description
1 — Engine compartment prefuse box
2 150 Hybrid: Additional battery relay for ECO start/stop function
3 40 Blower regulator
4 — Spare
5 150 Valid for diesel engine: PTC heater booster
6 80 Right A-pillar fuse box
7 150 Rear fuse and relay module
8 — Spare
9 — Spare
10 60 Valid for transmission 722, 725: Fully integrated transmission control unit
100 Hybrid: Fully integrated transmission control unit
11 — Spare
12 40 Rear fuse and relay module
13 50 Right A-pillar fuse box

Prefuse Box in Engine Compartment

Variant 1

Mercedes Benz C-Class w205 - fuse box diagram - engine compartment - prefuse (variant 1)

Variant 2

Mercedes Benz C-Class w205 - fuse box diagram - engine compartment - prefuse (variant 2)

F32/3k1 – Decoupling relay

Number A Description
1 — Spare
2 100 Valid for diesel engine: Glow output stage
3 60 Engine fuse and relay module
4 — On-board electrical system battery connection
5 150 Engine fuse and relay module
6 125 Left fuse and relay module
7 80 Fan motor (600 W / 850 W)
8 125 Electrical power steering control unit
9 150 Fan motor (1000 W)
10 200 Vehicle interior prefuse box
11 — Spare
12 — Hybrid: Power electronics control unit
With engine 651.9 and USA version: Catalytic converter heater control unit
13 400 Alternator
C1 — Hybrid: Decoupling relay
C2 — Hybrid: Circuit 31
C3/1 40 Valid except AMG: Electronic Stability Program control unit
C3/2 60 Electronic Stability Program control unit 

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

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