Table of Contents
The Mercedes W205 is the fourth generation of the German automaker's C-Class compact executive cars, produced from February 2014. The model made its world debut at the North American International Auto Show in January 2014. In this article, we provide a detailed overview of the fuse box diagrams for the Mercedes-Benz C-Class (W205 generation: S205 station wagon, W205 sedan, C205 coupé, and A205 cabriolet) for model years 2014 through 2021.
Here you will find power distribution box locations, layout diagrams, and photos. Fuses responsible for the “Cigarette lighter” and “Fuel pump” circuits are highlighted in bold.
In the Passenger Compartment
Three power distribution boxes are located in the cabin to protect the vehicle's electrical circuits.
Power Fuse Box
Located behind the interior trim in the front passenger footwell.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Rating (A) |
| 1 | Engine compartment main power fuse box | |
| 2 | Hybrid: Auxiliary battery relay for ECO start/stop function | 150 |
| 3 | Blower motor controller | 40 |
| 4 | Unassigned | - |
| 5 | Diesel: Auxiliary electric heater | 150 |
| 6 | Right A-pillar fuse box | 80 |
| 7 | Rear passenger compartment fuse and relay box | 150 |
| 8 | Unassigned | - |
| 9 | Unassigned | - |
| 10 | Vehicles with 725 transmission: Fully integrated transmission control (VGS) unit (60 A) Hybrid vehicles with 724 transmission: Fully integrated transmission control (VGS) unit (100 A) |
60 / 100 |
| 11 | Unassigned | - |
| 12 | Rear passenger compartment fuse and relay box | 40 |
| 13 | Right A-pillar fuse box | 50 |
| F32 4k2 |
Quiescent current cutoff relay | - |
Dashboard End-Face Fuse Box
Located on the left end-face of the dashboard (driver side). To access the fuses, carefully pry off the protective cover using a trim tool or screwdriver.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Rating (A) |
| F | Terminal 15R relay | - |
| 200 | Front SAM control unit | 50 |
| 201 | Front SAM control unit | 40 |
| 202 |
|
5 |
| 203 | Vehicles with 716 transmission: Electronic steering column lock control unit | 20 |
| 204 | OBD-II diagnostic connector | 5 |
| 205 | Electronic ignition lock (EZS) control unit | 7.5 |
| 206 | Analog clock | 5 |
| 207 | HVAC control unit | 15 |
| 208 | Instrument cluster | 7.5 |
| 209 | Climate control panel | 5 |
| 210 | Steering column switch module (N80) control unit signals | 5 |
| 211 | AMG: ESP control unit signals | 25 |
| 212 | Antenna switch for mobile phone and auxiliary heater | 5 |
| 213 | ESP control unit signals | 5 |
| 214 | AMG: Electric parking brake control unit | 30 |
| 215 | Unassigned | - |
| 216 | Glove compartment illumination | 7.5 |
| 217 | Japan: Dedicated Short-Range Communications (DSRC) toll control unit | 5 |
| 218 | Supplemental Restraint System (SRS) control unit | 7.5 |
| 219 | Weight Sensing System (WSS) control unit | 5 |
| 220 | Unassigned | - |
Passenger Footwell Fuse Box
Located on the front passenger side beneath the dashboard near the door pillar. Remove the access cover to view the panel.
Representative illustration shown.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Rating (A) |
| MF1/1 | Audio display / COMAND display, Head unit cooling fan motor (COMAND APS) | 7.5 |
| MF1/2 | Multifunction camera | 7.5 |
| MF1/3 | W205, S205, V205: Overhead control panel Rain/light sensor with auxiliary functions |
7.5 |
| MF1/4 | Front seat heating control unit (from June 1, 2015) / Driver seat heating control unit (up to May 31, 2015) / Driver seat control unit | 7.5 |
| MF1/5 | Front passenger seat heating control unit (up to May 31, 2015) / Front passenger seat control unit / Front seat heating control unit (from June 1, 2015) | 7.5 |
| MF1/6 | Steering column switch module control unit signals | 7.5 |
| MF2/1 | Front left reversible seat belt tensioner (PRE-SAFE®) | 5 |
| MF2/2 | Touchpad (Audio 20 radio or COMAND APS) / Audio/COMAND control panel | 5 |
| MF2/3 | Front right reversible seat belt tensioner (PRE-SAFE®) | 5 |
| MF2/4 | Head-up display (HUD) | 5 |
| MF2/5 | Media connectivity module | 5 |
| MF2/6 | Hybrid: Electric A/C compressor | 5 |
| MF3/1 | Front SAM control unit terminal 30g feedback circuit | 5 |
| MF3/2 | Radar sensor control unit | 5 |
| MF3/3 | Unassigned | - |
| MF3/4 | Driver side instrument panel switch bank | 5 |
| MF3/5 | Rear climate control panel | 5 |
| MF3/6 | Tire pressure monitoring system (TPMS) control unit | 5 |
| 301 | Hybrid: Pyrotechnic fuse (F63) for high-voltage system disconnect | 5 |
| 302 | Front right door control unit | 30 |
| 303 |
|
30 |
| 304 | Vehicles with 722 transmission: DIRECT SELECT electronic selector lever module | 20 |
| 305 | Front seat heating control unit (from June 1, 2015) / Driver seat heating control unit (up to May 31, 2015) / Driver seat control unit | 30 |
| 306 |
|
30 |
| 307 | AMG: Active engine mount control unit | 5 |
| 308 | USA: Electric trailer brake controller electrical connector | 30 |
| 309 | Emergency call system control unit | 10 |
| HERMES communication module for telematics services | 5 | |
| 310 | AMG: Active engine mount control unit | 20 |
| 311 | Rear passenger compartment auxiliary fan control unit | 10 |
| 312 | Overhead control panel | 10 |
| 313 | Hybrid: Power electronics control unit | 10 |
| 314 | AMG: Electronic rear axle differential lock control unit | 5 |
| 315 |
|
5 |
| 316 | Supplemental Restraint System (SRS) control unit | 7.5 |
| 317 | Panoramic sliding sunroof control module | 30 |
| 318 | Auxiliary heater control unit | 20 |
| 319 | Hybrid: High-voltage electric heater system | 5 |
| 320 | Adaptive Damping System (ADS) control unit / AIRMATIC control unit | 25 |
| 321 | Japan: Dedicated Short-Range Communications (DSRC) toll unit | 5 |
| 322 | Head unit | 20 |
| 323 | Park Assist control unit | 5 |
In the Luggage Compartment
The fuse panel is located underneath the trunk floor panel.
| Diagram | ||
|---|---|---|
Type 1
|
||
Type 2
|
||
| No. | Rating (A) | Description |
| S | Terminal 15 cabin relay | |
| T | Heated rear window relay | |
| U | Relay for cup holder and rear seat power sockets | |
| IN | AdBlue® system relay | |
| X | Relay for coolbox and front seat / trunk power sockets | |
| Y | Unassigned | |
| ZR1 | Vehicles with OM626 engine: Fuel filter heater | |
| ZR2 | Unassigned | |
| ZR3 | Unassigned | |
| 400 | 25 | AdBlue® system control unit |
| 401 | 15 | AdBlue® system control unit |
| 402 | 20 | AdBlue® system control unit |
| 403 | 30 | Up to Nov 30, 2015: Front passenger seat adjustment switch |
| 25 | From Dec 1, 2015: Front passenger seat adjustment switch | |
| 404 | 30 | Up to Nov 30, 2015: Driver seat adjustment switch |
| 25 | From Dec 1, 2015: Driver seat adjustment switch | |
| 405 | - | Unassigned |
| 406 | 30 | Front left door control unit |
| 407 | - | Unassigned |
| 408 | 30 |
|
| 409 | - | Unassigned |
| 410 | 15 | Auxiliary heater radio remote control receiver |
| 411 | 30 | Front left reversible seat belt tensioner (PRE-SAFE®) |
| 412 | 7.5 | Hybrid: Battery management system (BMS) control unit |
| 413 | 5 | Trunk lid / tailgate actuator control unit |
| 414 | 5 | Tuner module (TV tuner, digital radio [DAB], or SiriusXM satellite radio) |
| 415 | 5 | Air balance system fragrance generator, Glove compartment lid control unit |
| 416 | 7.5 | Mobile phone cradle, Antenna amplifier / mobile phone compensator |
| 417 | 5 | Rearview camera / 360° camera control unit |
| 418 | 5 | AIRSCARF® control unit, Rear seat heating control unit |
| 419 | 5 | Front passenger seat lumbar support adjustment |
| 420 | 5 | Driver seat lumbar support adjustment |
| 421 | - | Unassigned |
| 422 | - | Unassigned |
| 423 | 5 | Audio system amplifier control unit |
| 424 | 15 | Vehicles with M276 engine: Sound generator control unit |
| 425 | - | Unassigned |
| 426 | - | Unassigned |
| 427 | - | Unassigned |
| 428 | - | Unassigned |
| 429 | - | Unassigned |
| 430 | - | Unassigned |
| 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 |
| 25 | AMG: Electronic rear axle differential lock control unit | |
| 436 | 15 | Trailer recognition control unit |
| 437 | 25 | |
| 438 | 30 | AC/DC converter control unit |
| 439 | 5 | Taximeter / Rearview mirror integrated taximeter |
| 25 | A205: Rear compartment control unit | |
| 440 | 30 | AIRSCARF® system / rear seat heating control unit |
| 441 | 30 | AIRSCARF® control unit |
| 442 | 25 | Fuel pump control unit |
| 443 | 30 | Front right reversible seat belt tensioner (PRE-SAFE®) |
| 444 | 15 | Tablet computer power socket |
| 445 | 15 | S205: Luggage compartment power socket |
| 446 | 15 | 12 V socket with front ashtray illumination (Mercedes-Benz W205 cigarette lighter fuse) |
| 447 | 15 | 12 V socket in rear center console (right) |
| 448 | 10 | Vehicles with 722 or 725 transmission: Parking lock capacitor |
| 449 | 5 |
|
| 450 | 5 | Rear SAM control unit |
| 451 | 5 | AdBlue® system / Fuel pump control unit |
| 452 | 5 | Rear bumper radar sensors (outer left/right, inner left/right) |
| 453 | 5 | COLLISION PREVENTION ASSIST control unit, Front bumper radar sensors (left, right) |
| 454 | 7.5 | Vehicles with 722 transmission: Fully integrated automatic transmission control unit |
| 5 | Driving school package: Dual pedal sensor / footwell light switch | |
| Model 253 (GLC): AdBlue® control unit | ||
| 455 | 5 | AC/DC converter control unit |
| 456 | 5 | DISTRONIC control unit, Long-range radar sensor |
| 457 | 5 | Hybrid: Battery management system / power electronics control unit |
| AMG: Active engine mount control unit / Electronic rear axle differential lock control unit | ||
| 458 | 5 | HANDS-FREE ACCESS sensor module (rear bumper) |
| 459 | 5 | AMG: AMG RIDE CONTROL suspension control unit Hybrid: High-voltage charger |
| 460 | 10 | KEYLESS-GO control unit |
| 461 | 5 | FM1/AM antenna amplifier and KEYLESS-GO system |
| 462 | 40 | Audio system amplifier control unit |
| 463 | 30 | A205, C205: Soft top / interior electrical connector W205, S205, V205: Heated rear window (R1) via noise suppression capacitor |
| 464 | 40 | Luggage compartment lid / tailgate actuator control unit |
| 465 | 40 | Rear SAM control unit |
| 466 | 40 | Rear SAM control unit |
| 467 | 40 |
|
In the Engine Compartment
Two power distribution boxes are located in the engine compartment to safeguard high- and low-current electrical circuits.
High-Current Fuse Block (Pre-Fuse Box)
The pre-fuse box is located near the battery.
Representative illustration shown.
| Diagram | ||
|---|---|---|
Type 1
|
||
Type 2
|
||
| No. | Description | Rating (A) |
| C1 | Hybrid: Trip relay | - |
| C2 | Hybrid: Terminal 31 (Ground) | - |
| C3/1 | ESP control unit | 40 |
| C3/2 | ESP control unit | 60 |
| F32 3k1 |
Cutoff relay | - |
| 1 | Unassigned | - |
| 2 | Diesel: Glow plug output stage module | 100 |
| 3 | Engine compartment fuse and relay box | 60 |
| 4 | On-board electrical system battery connector | - |
| 5 | Engine compartment fuse and relay box | 150 |
| 6 | Left fuse and relay box | 125 |
| 7 | Cooling fan motor | 80 |
| 8 | Electric power steering control unit | 125 |
| 9 | Cooling fan motor (1000 W) | 150 |
| 10 | Passenger compartment power fuse box | 200 |
| 11 | Unassigned | - |
| 12 | USA: Heated catalytic converter control unit Hybrid: Power electronics control unit |
- |
| 13 | Alternator | 400 |
Engine Compartment Fuse Box
Located on the left side of the engine compartment. To access the fuses, remove the plastic trim cover and loosen the retaining screws on the fuse box lid.
Overview of the Mercedes-Benz C-Class (W205) engine compartment fuse box.
| Diagram | ||
|---|---|---|
|
||
| No. | Rating (A) | Description |
| G | Engine compartment terminal 15 relay | |
| H | Terminal 50 starter relay | |
| I | Hybrid: Vacuum pump positive (+) relay | |
| J | Drive system control unit (CPC) relay | |
| K | Vehicles with 722.9 transmission (except 722.930): Transmission oil pump relay | |
| L | Horn relay | |
| M | Windshield wiper park heating relay | |
| N | Terminal 87M relay | |
| O | Hybrid: Terminal 15 starter relay | |
| P | Vehicles with M274 engine: Coolant pump relay | |
| Q | Hybrid: Vacuum pump negative (-) relay | |
| R | AIRMATIC compressor relay | |
| 100 | 40 | Hybrid: Electric vacuum pump |
| 101 | 15 | Except AMG: Terminal 87/2 connector |
| 20 | AMG: Terminal 87/2 connector | |
| 102 | 20 | Except AMG: Terminal 87/1 connector |
| 25 | AMG: Terminal 87/1 connector | |
| 103 | 15 | Except AMG: Terminal 87/4 connector |
| 20 | AMG: Terminal 87/4 connector | |
| 104 | 15 | Except AMG: Terminal 87/3 connector |
| 20 | AMG: Terminal 87/3 connector | |
| 105 | 15 | Vehicles with 722.9 transmission (except 722.930): Auxiliary transmission oil pump control unit |
| 106 | - | Unassigned |
| 107 | 60 | Vehicles with M274 engine: Electric coolant pump |
| 108 | 20 |
|
| 109 | 30 | Windshield wiper motor |
| 110 | 20 |
|
| 111 | 30 | Starter motor |
| 112 | 15 | Hybrid: Accelerator pedal module |
| 113 | - | Unassigned |
| 114 | 40 | AIRMATIC air suspension compressor |
| 115 | 15 | Dual-tone horn |
| 116 | - | Unassigned |
| 117 | - | Unassigned |
| 118 | 5 | Hybrid: ESP control unit |
| 119 | 15 | Terminal 87 C2 connector |
| 120 | 5 | Except AMG: Terminal 87 C1 connector |
| 15 | AMG: Terminal 87 C1 connector | |
| 121 | 5 | ESP control unit |
| 122 | 5 | Drive system control unit (CPC) relay |
| 123 | - | Unassigned |
| 124 | - | Unassigned |
| 125 | 5 | Front SAM control unit |
| 126 | 5 |
|
| 127 | 5 | Hybrid: Voltage drop limiter |
| 128 | 5 | Left headlamp assembly and exterior light switch module |
| 129 | 30 | Hybrid: Terminal 50 starter relay |
| 129A | 30 | |