Mercedes-Benz C-Class W205 (2014-2019) – fuse and relay box

Diagrams of fuse boxes and relays – Mercedes-Benz C-Class W205

Applies to vehicles manufactured in the years:

2014, 2015, 2016, 2017, 2018, 2019.

The cigarette lighter in the Mercedes-Benz C-Class W205  is fuse number fuse 446 in the fuse box in the luggage compartment.

Fuse box on the dashboard

Mercedes-Benz C-Class W205 – fuse box diagram – dashboard
Number Amperes [A] Description
200 50 Front SAM control unit
201 40 Front SAM control unit
202 5 Alarm siren;
ATA [EDW] / towing protection / interior guarding control unit (A205).
203 20 Valid with gearbox 716:

Electric steering lock

204 5 Diagnostic connector
205 7.5 Electronic ignition lock control unit
206 5 Analog clock
207 15 Climate control unit
208 7.5 Instrument cluster
209 5 Climate control unit operating
unit Top control control panel
210 5 Steering wheel lamp module control unit
211 25 AMG:

Electronic stability program control unit

212 5 from 01/06/2016:

Antenna switch for telephone and stationary heating

213 5 Electronic stability program control unit
214 30 AMG:

Electric parking brake control unit

215 Reserve
216 7.5 Lamp in the glove box
217 5 Japanese version:

Dedicated control unit for short-range communication

218 7.5 Supplemental restraint system control unit
219 5 Mass detection system (WSS) control unit
220 Reserve
Relay
D Relay, circuit 15R

Fuse box in the engine compartment

Mercedes-Benz C-Class w205 – fuse box diagram – engine compartment
Number Amperes [A] Description
100 40 Hybrid:

Vacuum pump

101 15 With the exception of AMG:

connecting sleeve, circuit 87/2

20 AMG:

connecting sleeve, circuit 87/2

102 20 With the exception of AMG:

connecting sleeve, circuit 87/1

25 AMG:

connecting sleeve, circuit 87/1

103 15 With the exception of AMG:

connecting sleeve, circuit 87/4

20 AMG:

connecting sleeve, circuit 87/4

104 15 With the exception of AMG:

connecting sleeve, circuit 87/3

20 AMG:

connecting sleeve, circuit 87/3

105 15 Valid for gearbox 722.9 (except 722.930):

Automatic transmission auxiliary oil pump control unit

106 Reserve
107 60 Valid with engine 274.9:

Electric coolant pump

108 20 Static LED headlight:  right front headlight;

High-performance LED headlight, dynamic LED headlight:
left front headlight;
Right front headlight.

109 30 Wiper motor
110 20 Static LED headlight:

Left front headlight

High-performance LED, dynamic LED headlight:
Left front headlight;
Right front headlight.
111 30 Starter
112 15 Hybrid:

accelerator pedal sensor

113 Reserve
114 40 AIRmatic compressor
115 15 Left horn and right horn
116 Reserve
117 Reserve
118 5 Hybrid:

electronic stability program control unit

119 15 Circuit 87 C2 connector sleeve
120 5 With the exception of AMG:

circuit connector sleeve 87 C1

15 AMG:

circuit connector sleeve 87 C1

121 5 Electronic stability program control unit
122 5 CPC relay
123 Reserve
124 Reserve
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 decay limiter

128 5 Left front lamp assembly and exterior light switch
129 30 Hybrid:

starter circuit 50 relay

129A 30 Hybrid:

starter circuit 50 relay

Relay
G. Relay 15 in the engine compartment
H. Starter relay 50
I Hybrid:

vacuum pump relay (+)

J. CPC relay
K. Valid for the gearbox 722.9 (except 722.930):

Oil pump relay 

L Horn relay
M. Wiper park position heater relay
N Relay circuit 87M.
O Hybrid:

starter circuit 15 relay

P. Valid with engine 274.9:

Relay pump  liquid  cooling

Q Hybrid:

vacuum pump relay (-)

R AIRmatic relay 

Fuse box in the passenger footwell

Mercedes Benz C-Class W205 – Fuse box diagram – passenger footwell
Number Amperes [A] Description
301 5 Hybrid:

pyrofusion through a high-voltage disconnect device

302 30 Right front door control unit
303 30 W205, S205, V205:

Left rear door control unit ;

A205, C205:

Rear driver .

304 20 Gearbox 722:

Intelligent servo module for DIRECT SELECT

305 30 Driver seat controller;

Driver seat heating controller;

Front seat heating control unit.

306 30 Front passenger seat control unit;

Front passenger seat heating control unit;

Front seat heating control unit.

307 5 AMG:

Active engine mount control unit

308 30 USA version:

electrical connector for the electric brake control

309 10 Emergency call system control unit
5 HERMES control unit;

Telematics services communication module.

310 20 AMG:

Active engine mount control unit

311 10 Booster electronic blower control
312 10 Suspended 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 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;

Control unit with adaptive damping system.

321 5 Japanese version:

dedicated control unit for short-range communication 

322 20 Main unit 
323 5 Parking system control unit
MF1 / 1 7.5 Audio / COMAND display;

Audio equipment fan motor.

MF1 / 2 7.5 Multi-functional stereo camera;

Multifunctional monaural camera.

MF1 / 3 7.5 Rain and light sensor with additional functions;

W205, S205, V205:

Suspended control panel.

MF1 / 4 7.5 Driver seat controller;

Driver seat heating controller;

Front seat heating control unit.

MF1 / 5 7.5 Front passenger seat control unit;

Front passenger seat heating control unit;

Front seat heating control unit.

MF1 / 6 7.5 Steering wheel lamp module control unit
MF2 / 1 5 Front left reversible emergency tensioner
MF2 / 2 5 Audio / COMAND control panel;

Touchpad.

MF2 / 3 5 Right front reversible emergency tension retractor
MF2 / 4 5 Heads-up display
MF2 / 5 5 Multimedia connection unit
MF2 / 6 5 Hybrid:

electric refrigerant compressor

MF3 / 1 5 Feedback line, clamp 30g, front SAM control unit
MF3 / 2 5 Radar sensors control unit
MF3 / 3 Reserve
MF3 / 4 5 A group of buttons on the driver’s side instrument panel 
MF3 / 5 5 Rear air conditioning control unit
MF3 / 6 5 Tire pressure monitor control unit 

Fuse box in the trunk

Option 1

Mercedes Benz C Class W205 – fuses diagram – trunk (variant 1)

Variant 2

Mercedes Benz C-Class W205 – fuse box diagram – trunk (variant 2)

1 – Terminal 30 “E1”
power supply 2 – Terminal 30g “E2” power supply

Number Amperes [A] Description
400 25 BlueTEC:

AdBlue ® control unit

401 15 BlueTEC:

AdBlue ® control unit

402 20 BlueTEC:

AdBlue ® control unit

403 30 Valid until November 30, 2015:

Front passenger seat, semi-electric seat adjustment switch

25 Valid from 01/12/2015:

Front passenger seat, semi-electric seat adjustment switch

404 30 Valid until November 30, 2015:

Driver seat, semi-electric seat adjustment switch

25 Valid from 01/12/2015:

Driver seat, semi-electric seat adjustment switch

405 Reserve
406 30 Left front door control unit
407 Reserve
408 30 W205, S205, V205:

Right rear door control unit ;

A205, C205:

Rear driver.

409 Reserve
410 5 Stationary radio receiver for remote control of the heater;

Antenna switch for telephone and stationary heater.

411 30 Front left reversible emergency tensioner
412 7.5 Hybrid:

battery management system control unit

413 5 Trunk lid control unit
414 5 Tuner module
415 5 Camera cover control unit;

Perfume sprayer generator.

416 7.5 Antenna amplifier / compensator for a cellular telephone system;

Mobile phone contact plate.

417 5 360 ° camera control unit;

Reversing camera.

418 5 Rear seat heating control unit;

AIRSCARF control unit.

419 5 Front passenger seat lumbar support adjustment control unit
420 5 Driver’s seat lumbar support adjustment control unit
421 Reserve
422 Reserve
423 5 Sound system amplifier control unit
424 15 AIR BODY CONTROL Plus control unit;

Valid for engine 276:

Engine sound control unit.

425 Reserve
426 Reserve
427 Reserve
428 Reserve
429 Reserve
430 Reserve
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;

Taximeter with mirror.

25 A205:

Rear control unit 

440 30 Rear seat heating control unit;

AIRSCARF control unit.

441 30 AIRSCARF control unit
442 25 Fuel system control unit
443 30 Right front reversible emergency tension retractor
444 15 Tablet pc electrical connector
445 15 S205:   Trunk socket
446 15 Front cigarette lighter with ashtray lighting;

Vehicle interior power socket.

447 15 12V socket in right center console 
448 10 Valid for transmission 722, 725:

Ratchet 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 BlueTEC fuel system control unit:  

AdBlue ® control unit

452 5 Integrated radar sensor for the outer right rear bumper;

Integrated radar sensor for outer left rear bumper;

Center rear bumper radar sensor;

Outside Right Rear Radar Sensor;

Outside Left Rear Bumper Radar Sensor.

453 5 Left front bumper radar sensor;

Right front bumper radar sensor;

COLLISION PREVENTION ASSIST driver.

454 7.5 Valid for transmission 722:

In the  fully integrated transmission control unit

5 Driving school package:

footwell lighting 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.

457 5 Hybrid:

Power electronics control unit;

Battery management system control unit;

AMG:

Electronic differential control unit;

Control unit with active engine mount.

458 5 Rear switch 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 heating by rear window anti-interference capacitor;

A205, C205:

Soft top section / electrical connector inside the vehicle.

464 40 Trunk lid control unit;

Liftgate controller.

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 relay 15 
T. Rear window heater relay
U Second row cup holder and socket relay
V BlueTEC:   AdBlue ® relay
X 1st row of seats / trunk refrigerator box and sockets relay 
Y Spare relay 
ZR1 Valid for engine 626:

Fuel filter heater relay 

ZR2 Backup relay
ZR3 Backup relay

Inner pre-box

Mercedes Benz C-Class W205 – fuse box diagram – interior – prefuse

F32 / 4k2 – Relay for shutting down the closed circuit

Number Amperes [A] Description
1 Engine compartment pre-fuse box
2 150 Hybrid:

additional battery relay for the ECO start / stop function

3 40 Blower regulator
4 Reserve
5 150 Valid for diesel engine:

PTC heater amplifier

6 80 Fuse box on the right A pillar.
7 150 Rear fuse and relay module
8 Reserve
9 Reserve
10 60 Valid for transmission 722, 725:

In the fully integrated transmission control unit

100 Hybrid:

In the  fully integrated transmission control unit

11 Reserve
12 40 Rear fuse and relay module
13 50 Fuse box on the right A pillar.

Prefuse Box in the engine compartment

Option 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 Amperes [A] Description
1 Reserve
2 100 Valid for diesel engine:

glow power level

3 60 Engine fuse and relay module
4 Connecting the on-board battery of the electrical system
5 150 Engine fuse and relay module
6 125 Left fuse and relay module
7 80 Fan motor (600W / 850W)
8 125 Electric power steering control unit
9 150 Fan motor (1000 W)
10 200 Pre-box inside the vehicle
11 Reserve
12 Hybrid:

Power electronics control unit;

With 651.9 engine and USA version:

Catalyst heater control unit.

13 400 Alternator
C1 Hybrid:

decoupling relay

C2 Hybrid:

circuit 31

C3 / 1 40 With the exception of AMG:

electronic stability program control unit

C3 / 2 60 Electronic stability program control unit 
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