Table of Contents
Mercedes-Benz W205 is the fourth generation of the German automaker's C-Class compact prestige cars, produced since February 2014. The model had its world premiere at the North American International Auto Show in January 2014. In this article, we will take a detailed look at the fuse box diagrams for the Mercedes C-Class (second generation; S205 station wagon, W205 sedan, C205 coupe and A205 convertible) of 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 years of manufacture
Here you will find the locations and photos of distribution boxes. The fuses responsible for the “Cigarette lighter” and “Fuel Pump” are highlighted in bold.
In the passenger compartment
There are three distribution boxes here, which are responsible for protecting the vehicle's electrical circuits.
Power fuse box
Placed behind the trim in the passenger footwell.
| 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 box in the rear part of the passenger compartment | 150 |
| 8 | Not used | - |
| 9 | Not used | - |
| 10 | With gearbox 725: Control unit for fully integrated gearbox control system 60A Hybrid with gearbox 724: Control unit for fully integrated transmission control system 100A |
60 / 100 |
| 11 | Not used | - |
| 12 | Fuse and relay box in the rear part of the passenger compartment | 40 |
| 13 | A-pillar fuse box on the right side | 50 |
| F32 4k2 |
Standstill current cut-off relay | - |
Unit at the end of the dashboard
It is located in the left end of the dashboard (driver's side). To access the fuses, remove the protective cover by prying it off with a screwdriver.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Amps |
| F | Relay terminal 15R | - |
| 200 | Front SAM control unit | 50 |
| 201 | Front SAM control unit | 40 |
| 202 |
|
5 |
| 203 | Transmission models 716: 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 | - |
Unit on the rack under the dashboard
Located on the passenger side between the instrument panel and the door. Remove the inspection cover for access.
The photo shows an example.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Amps |
| MF1/1 | Audio system display / COMAND, Audio unit fan motor (COMAND APS) | 7.5 |
| MF1/2 | Multifunction camera | 7.5 |
| MF1/3 | W205, S205, V205: Roof mounted control panel Rain and light sensor with additional functions |
7.5 |
| MF1/4 | Front seat heating control unit (from 01.06.2015), Driver seat heating control unit (up to 31.05.2015) / Driver 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 seatbelt tensioner | 5 |
| MF2/2 | Touch panel (Audio 20 radio or COMAND APS), Audio/COMAND control panel | 5 |
| MF2/3 | Reversible front right seatbelt tensioner | 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 driver's side instrument panel | 5 |
| MF3/5 | Rear air conditioning control panel | 5 |
| MF3/6 | Tire pressure monitoring control unit | 5 |
| 301 | Hybrid: Pyro fuse (F63) for high voltage mains disconnection | 5 |
| 302 | Front right door control unit | 30 |
| 303 |
|
30 |
| 304 | Transmission 722: Automatic transmission servo module for DIRECT SELECT system | 20 |
| 305 | Front seat heating control unit (from 01.06.2015), Driver seat heating control unit (until 31.05.2015), Driver seat control unit | 30 |
| 306 |
|
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 control of the auxiliary fan in the rear of the passenger compartment | 10 |
| 312 | Ceiling Control Panel | 10 |
| 313 | Hybrid: Power electronics control unit | 10 |
| 314 | AMG: Electronic differential control unit | 5 |
| 315 |
|
5 |
| 316 | Passenger Restraint System Control Unit (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 pan.
| Diagram | ||
|---|---|---|
Type 1
|
||
Type 2
|
||
| No. | Amps | Description |
| S | Cabin terminal relay #15 | |
| T | Rear window heater relay | |
| U | Relay for cupholder and sockets in 2nd row of seats | |
| IN | AdBlue® system | |
| X | Relay for refrigerator box and power outlets in 1st row seat / 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 | up to 30.11.2015 Front passenger seat position adjustment switch |
| 25 | from 01.12.2015: Front passenger seat position adjustment switch | |
| 404 | 30 | Before 11/30/2015: Driver seat position adjustment switch |
| 25 | From 12/01/2015: Driver's seat position adjustment switch | |
| 405 | - | Not involved |
| 406 | 30 | Front left door control unit |
| 407 | - | Not involved |
| 408 | 30 |
|
| 409 | - | Not involved |
| 410 | 15 | Receiver of the radio remote control of the autonomous heater |
| 411 | 30 | Reversible front left seatbelt tensioner |
| 412 | 7.5 | Hybrid: Battery management system control unit |
| 413 | 5 | Trunk lid actuator control unit |
| 414 | 5 | Tuner module (TV tuner, digital radio (DAB)) or SIRIUS satellite radio) |
| 415 | 5 | Air fragrance system generator, Chamber lid control unit |
| 416 | 7.5 | Cell phone contact board, Antenna amplifier / cell phone compensator |
| 417 | 5 | Rear View Camera, 360° Camera Control Unit |
| 418 | 5 | AIRSCARF system control unit, Rear seat heating control unit |
| 419 | 5 | Front passenger seat lumbar support adjustment |
| 420 | 5 | Driver seat lumbar support 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 |
|
| 450 | 5 | Rear SAM control unit |
| 451 | 5 | AdBlue® system, Fuel pump control module |
| 452 | 5 | Radar sensors in the rear bumper: outside right and left, center to 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 Press Control Sensor, Footwell Light Switch | |
| Type 253: AdBlue® control unit | ||
| 455 | 5 | AC/DC converter control unit |
| 456 | 5 | DISTRONIC electric control module, Radar sensor for the far front area |
| 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: AMG chassis control unit 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 plug connection of the soft folding top / vehicle interior W205, S205, V205: Rear window heating (R1) via rear window interference suppression capacitor |
| 464 | 40 | Luggage compartment door tilt actuator control unit Trunk lid actuator control unit |
| 465 | 40 | Rear SAM |
| 466 | 40 | Rear SAM |
| 467 | 40 |
|
In the engine compartment
There are two distribution boxes here that are responsible for protecting the electrical circuits.
Power fusible links
The high power fuse box is located near the battery.
The photo shows an example.
| Diagram | ||
|---|---|---|
Type 1
|
||
Type 2
|
||
| No. | Description | Amps |
| C1 | Hybrid: Trip Relay | - |
| C2 | Hybrid: Terminal 31 | - |
| C3/1 | ESP control unit | 40 |
| C3/2 | ESP control unit | 60 |
| F32 3k1 |
Isolating relay | - |
| 1 | Not used | - |
| 2 | Diesel: Glow Plug Output Stage Module | 100 |
| 3 | fuse and relay box in the engine compartment | 60 |
| 4 | On-board battery connector | - |
| 5 | fuse and relay box in the engine compartment | 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 box in the cabin | 200 |
| 11 | Not used | - |
| 12 | USA: Catalyst heater control unit Hybrid: Power electronics control unit |
- |
| 13 | Alternator | 400 |
Fuse box
It is located on the left side of the underhood. To access it, remove the cladding and unscrew the fastening screws of the protective cover.
General view of the Mercedes C-Class W205 underhood fuse box.
| 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 (beep) relay | |
| M | Wiper blade 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 | Except AMG: Cable end coupling terminal 87/2 |
| 20 | AMG: Cable end coupling terminal 87/2 | |
| 102 | 20 | Not AMG: Cable end coupling terminal 87/1 |
| 25 | AMG: Cable end coupling terminal 87/1 | |
| 103 | 15 | Not AMG: Cable end coupling terminal 87/4 |
| 20 | AMG: Cable end coupling terminal 87/4 | |
| 104 | 15 | Not AMG: Cable end coupling terminal 87/3 |
| 20 | AMG: Cable end coupling terminal 87/3 | |
| 105 | 15 | Gearbox 722.9 (except 722.930): Transmission auxiliary oil pump control unit |
| 106 | - | Not involved |
| 107 | 60 | Engine 274.9: Electric coolant pump |
| 108 | 20 |
|
| 109 | 30 | Wiper motor |
| 110 | 20 |
|
| 111 | 30 | Starter |
| 112 | 15 | Hybrid: Accelerator pedal position sensor |
| 113 | - | Not involved |
| 114 | 40 | AIRMATIC compressor |
| 115 | 15 | Beep (horn) |
| 116 | - | Not involved |
| 117 | - | Not involved |
| 118 | 5 | Hybrid: Electronic Stability Program (ESP) control unit |
| 119 | 15 | Cable end coupling terminal 87 C2 |
| 120 | 5 | Not AMG: Cable end coupling terminal 87 C1 |
| 15 | AMG: Cable end coupling 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 |
|
| 127 | 5 | Hybrid: Voltage drop limiter |
| 128 | 5 | Front left headlamp unit and exterior light switch |
| 129 | 30 | Hybrid: Starter relay (terminal 50) |
| 129A | 30 | |
