Fuses and relays Mercedes C-Class (W205, 2014 - 2021)

This material discusses in detail the fuse diagrams of a Mercedes C-class car (second generation, in the bodies: S205 station wagon, W205 sedan, C205 coupe and A205 convertible): 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 of release  .

Fuses numbered 445, 446 and 447 in the trunk block are responsible for protecting the electrical circuits of the cigarette lighters.

In the passenger compartment

There are three blocks responsible for protecting the electrical circuits of the car.

Power fuse box


Placed behind the trim at the passenger's feet.

Diagram
No. Description Amps
1 Engine compartment power fuse box  
2 Hybrid: Additional battery relay for ECO Start-Stop function 150
3 Fan controller 40
4 Not used -
5 Diesel: Additional electric heater 150
6 A-pillar fuse box, right 80
7 Fuse and relay module in the rear 150
8 Not used -
9 Not used -
10
  • With 725 gearbox: 60A fully integrated gearbox control unit
  • Hybrid with 724 gearbox: 100A fully integrated gearbox control unit
60 / 100
11 Not used -
12 Fuse and relay module in the rear 40
13 A-pillar fuse box, right 50
F32
4k2
Relay for quiescent current interruption -

Block at the end of the dashboard


It is located on the left side of the instrument panel (on the driver's side). To access the fuses, you need to remove the protective lining by prying it with a screwdriver.

Diagram
No. Description Amps
F Relay terminal 15R -
200 Front SAM control unit 50
201 Front SAM control unit 40
202
  • A205: EDW / towing protection / interior monitor control unit
  • alarm siren
5
203 Models with 716 gearbox: Electric steering column lock control unit 20
204 Diagnostic connector 5
205 Electronic ignition lock control unit 7.5
206 Analog clock 5
207 Heating, ventilation and air conditioning control unit 15
208 instrument cluster 7.5
209 Air conditioning control panel 5
210 Signals from the steering column electronic module control unit 5
211 AMG: Signals from the ESP control unit 25
212 Antenna switch for telephone and auxiliary heater 5
213 Signals from the ESP control unit 5
214 AMG: Electric parking brake control unit 30
215 Not used -
216 Glove box light 7.5
217 Japan: DSRC toll data transmission control unit 5
218 Control unit for passenger restraint system (Supplemental Restraint System) 7.5
219 Weight Sensing System control unit 5
220 Not used -

Block on the rack under the dashboard


It is located on the passenger side between the instrument panel and the door. To access, remove the revision cover.


Photo is an example.

Diagram
No. Description Amps
MF1/1 Audio Display / COMAND, Audio Fan Motor (COMAND APS) 7.5
MF1/2 Multifunction camera  7.5
MF1/3
  • W205, S205, V205: Ceiling mounted control panel
  • Rain and light sensor with additional functions
7.5
MF1/4 Front seat heating control unit (from 06/01/2015), Driver's seat heating control unit (until 05/31/2015) / Driver's seat control unit 7.5
MF1/5 Front passenger seat heating control unit (up to 05/31/2015), Front passenger seat control unit, Front seat heating control unit (from 06/01/2015) 7.5
MF1/6 Signals from the steering column electronic module control unit 7.5
MF2/1 Reversible front left seat belt pretensioner 5
MF2/2 Touch panel (Audio 20 radio or COMAND APS), Audio/COMAND control panel 5
MF2/3 Reversible front right seat belt pretensioner 5
MF2/4 Head-up display 5
MF2/5 Media Connectivity Module 5
MF2/6 Hybrid: Electric air conditioner compressor 5
MF3/1 Front SAM control unit terminal 30g readback wire 5
MF3/2 Radar control unit 5
MF3/3 Not involved -
MF3/4 Buttons on the instrument panel on the driver's side 5
MF3/5 Rear air conditioning control panel 5
MF3/6 Tire pressure monitoring control unit 5
301 Hybrid: Ignition fuse (F63) for shutting down the high voltage network 5
302 Front right door control unit 30
303
  • A205, C205: Rear compartment systems control unit
  • W205, S205, V205: Rear left door control unit
30
304 Transmission 722: Servo drive module for automatic transmission for DIRECT SELECT 20
305 Front seat heating control unit (from 06/01/2015), Driver's seat heating control unit (until 05/31/2015), Driver's seat control unit 30
306
  • Front passenger seat control unit
  • up to 05/31/2015: Front passenger seat heating control unit
  • as of 06/01/2015: Front seat heating control unit
30
307 AMG: Active engine mount control unit 5
308 USA: Electrical plug connection of the Elektric-Brake-Control function 30
309 Emergency call system control unit 10
Telecommunication Services Communication Module, HERMES Control Unit 5
310  AMG: Active engine mount control unit 20
311 Electronic controller for additional fan in the rear 10
312 Ceiling Control Panel 10
313 Hybrid: Power electronics control unit 10
314 AMG: Electronic differential control unit 5
315
  • Diesel: CDI control unit
  • Petrol: ME control unit
  • Transmission control unit
5
316 Control unit for passenger restraint system (Supplemental Restraint System) 7.5
317 Sliding sunroof control module (panoramic sunroof) 30
318 Autonomous heater control unit 20
319 Hybrid: High voltage electric heater system 5
320 Adaptive damping system control unit, AIRMATIC control unit 25
321 Japan: DSRC toll communication control unit 5
322 Head device 20
323 Parking assistance control unit 5

In the luggage compartment


The fuse box is located behind the floor covering.

Diagram
Type 1
Type 2
No. Amps Description
S Salon terminal relay No. 15  
T Heated rear window relay
U 2nd row cup holder and socket relay
IN AdBlue® system
X Relay for refrigerator box and sockets of the 1st row of seats / trunk
Y not used
ZR1 Models with 626 engine: fuel filter heating
ZR2 not used
ZR3 not used
400 25 AdBlue® system
401 15 AdBlue® system
402 20 AdBlue® system
403 30 to 11/30/2015 Front passenger seat adjustment switch
25 as of 12/01/2015: Front passenger seat adjustment switch
404 30 Before 11/30/2015: Driver seat adjustment switch
25 From 12/01/2015: Driver's seat adjustment switch
405 - Not involved
406 30 Front left door control unit
407 - Not involved
408 30
  • A205, C205: Rear compartment systems control unit
  • W205, S205, V205: Rear right door control unit
409 - Not involved
410 15 Remote radio remote control receiver for auxiliary heater
411 30 Reversible front left seat belt pretensioner
412 7.5 Hybrid: Battery management system control unit
413 5 Trunk lid drive control unit
414 5 Tuner module (TV tuner, digital radio (DAB)) or SIRIUS satellite radio)
415 5 Air Aroma Generator, Chamber Lid Control Unit
416 7.5 Mobile Phone Contact Board, Antenna Amplifier / Mobile Phone Compensator
417 5 Rear View Camera, 360° Camera Control Unit
418 5 AIRSCARF system control unit, Rear seat heating control unit
419 5 Adjusting the lumbar support for the front passenger seat
420 5 Driver's seat lumbar adjustment
421 - Not involved
422 - Not involved
423 5 Speaker amplifier control unit
424 15 Models with 276 engine: Motorsound control unit
425 - Not involved
426 - Not involved
427 - Not involved
428 - Not involved
429 - Not involved
430 - Not involved
431 25 Multifunction control unit for special vehicles
432 25 Multifunction control unit for special vehicles
433 15 Trailer recognition system
434 15 Trailer detection control unit
30 AMG: Electric parking brake control unit
435 25 Trailer recognition system
25  AMG: Electronic differential control unit
436 15 Trailer recognition system
437 25
438 30 AC/DC converter control box
439 5 Taximeter, Taximeter in interior rear-view mirror
25 A205: Rear compartment systems control unit
440 30 AIRSCARF system, rear seat heating control unit
441 30 AIRSCARF system control unit
442 25 Fuel pump control module
443 30 Reversible front right seat belt pretensioner
444 15 Tablet computer electrical plug connection
445 15 S205: Socket in trunk
446 15 12V socket with front ashtray light (Mercedes 205 cigarette lighter fuse)
447 15 12V socket in the rear of the passenger compartment on the right (center console)
448 10 Transmissions 722, 725: Park lock capacitor
449 5
  • AMG: Electric parking brake control unit
  • Models with 626 engine: Fuel filter element with built-in heating
450 5 Rear SAM control unit
451 5 AdBlue® system, Fuel pump control module
452 5 Radar sensors in the rear bumper: outer right and left, center
453 5 COLLISION PREVENTION ASSIST control module, radar sensors in front bumper: right, left
454 7.5 Transmission 722: Fully integrated automatic transmission control unit
5 Driving School Package: Pedal Sensor, Footwell Light Switch
Type 253: AdBlue® control unit
455 5 AC/DC converter control unit
456 5 Electric control module DISTRONIC, Far-field radar sensor front
457 5 Hybrid: battery management system, power electronics control module
AMG: Active engine mount control unit, Electronic differential control unit
458 5 5A Module for keyless opening of the trunk lid under the rear bumper
459 5 AMG: Chassis control unit AMG
Hybrid: Charger
460 10 kEyLESS-GO system control unit
461 5 Antenna amplifier FM 1, AM and KEYLESS-GO system
462 40 Speaker amplifier control unit
463 30 A205, C205: Electrical connector for soft top/vehicle interior
W205, S205, V205: Heated rear window (R1) via rear window interference suppression capacitor
464 40 Tailgate drive control unit
Tailgate drive control unit
465 40 Rear SAM
466 40 Rear SAM
467 40
  • A205: Rear compartment systems control unit
  • Models with 626 engine: Fuel filter element with built-in heating

In the engine compartment

There are two blocks responsible for protecting the electrical circuits of the car.

Power fuse links

The high power fuse box is located near the battery.


Photo - an example of execution.

Diagram
Type 1
Type 2
No. Description Amps
C1 Hybrid: Trip Relay -
C2 Hybrid: Terminal 31 -
C3/1 Signals from the ESP control unit 40
C3/2 Signals from the ESP control unit 60
F32
3k1
Isolating relay -
1 Not used -
2 Diesel: Glow Plug Output Stage Module 100
3 Engine fuse and relay module 60
4 On-board battery connector -
5 Engine fuse and relay box 150
6 Fuse and relay box, left 125
7 Fan motor 80
8 power steering 125
9 Cooling fan motor (1000W) 150
10 Power fuse block in the cabin 200
11 Not used -
12 USA: Catalyst heater control unit
Hybrid: Power electronics control unit
-
13 Generator 400

Fuse box


It is located on the left side of the engine compartment. For access, it is necessary to remove the lining and unscrew the fixing screws of the protective cover.


Photo is an example.

Diagram
No. Amps Description
G Terminal 15 relay, engine compartment
H Starter relay, terminal 50  
I Hybrid: Vacuum pump relay (+)
J CPC relay
K Reducer 722.9 (except 722.930): Oil pump relay
L Horn relay
M Wiper heater relay
N Relay terminal 87M
O Hybrid: Starter relay, terminal 15
P Engine 274.9: Coolant pump relay
Q Hybrid: Vacuum pump relay (-)
R AIRMATIC system relay
100 40 Hybrid: Vacuum pump
101 15 Not AMG: Cable termination terminal 87/2
20 AMG: Cable termination terminal 87/2
102 20 Not AMG: Cable termination terminal 87/1
25 AMG: Cable termination terminal 87/1
103 15 Not AMG: Cable termination terminal 87/4
20 AMG: Cable termination terminal 87/4
104 15 Not AMG: Cable termination terminal 87/3
20 AMG: Cable termination terminal 87/3
105 15 Reducer 722.9 (except 722.930): Control unit for auxiliary transmission oil pump
106 - Not involved
107 60 Engine 274.9: Electric coolant pump
108 20
  • High Performance LEDs or Dynamic Light LEDs: Front right headlight, Front left headlight
  • Static LED headlights: Front right headlamp
109 30 Wiper motor
110 20
  • Static LED headlights: Front left headlamp
  • High Performance LEDs or Dynamic Light LEDs: Front left headlight, Front right headlight
111 30 Starter
112 15 Hybrid: Accelerator position sensor
113 - Not involved
114 40 AIRMATIC compressor
115 15 Sound signal (horn)
116 - Not involved
117 - Not involved
118 5 Hybrid: Electronic Stability Program (ESP) control unit
119 15 Cable termination terminal 87 C2
120 5 Not AMG: Cable termination terminal 87 C1
15 AMG: Cable termination terminal 87 C1
121 5 electronic stabilization Program (ESP) control unit
122 5 CPC relay
123 - Not involved
124 - Not involved
125 5 Front SAM
126 5
  • Petrol: ME control unit
  • Diesel: CDI control unit
  • All: Transmission control unit
127 5 Hybrid: Voltage drop limiter
128 5 Front left headlight and outdoor light switch
129 30 Hybrid: Starter relay (terminal 50) 
129A 30
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