Fuse Box and Relay Diagrams – Mercedes-Benz C-Class W205
Applies to vehicles produced in the years:
2015, 2016, 2017, 2018, 2019, 2020, 2021.
The cigarette lighter in the Mercedes-Benz C-Class W205 is fuse number 446 in the fuse box in the trunk.
Fuse box on dashboard
| Number | Ampere [A] | Description |
| 200 | 50 | Front SAM control unit |
| 201 | 40 | Front SAM control unit |
| 202 | 5 | Alarm siren; ATA [EDW] / towing protection control unit / interior protection (A205). |
| 203 | 20 | Valid with 716 gearbox:Electric steering lock |
| 204 | 5 | Diagnostic connector |
| 205 | 7.5 | Electronic ignition switch control unit |
| 206 | 5 | Analogue clock |
| 207 | 15 | Climate control unit |
| 208 | 7.5 | Instrumentation |
| 209 | 5 | Climate control unit Upper control panel |
| 210 | 5 | Steering wheel light module control unit |
| 211 | 25 | AMG:Electronic control unit of the stability program |
| 212 | 5 | from 01/06/2016:Antenna switch for telephone and independent heating |
| 213 | 5 | Electronic control unit of the stability program |
| 214 | 30 | AMG:Electronic parking brake control unit |
| 215 | – | Reserve |
| 216 | 7.5 | Lamp in the glove compartment |
| 217 | 5 | Japanese version:Dedicated control unit for short-range communication |
| 218 | 7.5 | Supplemental restraint system control unit |
| 219 | 5 | Mass Sensing System (WSS) Control Unit |
| 220 | – | Reserve |
| relay | ||
| D | Relay, circuit 15R | |
Fuse box in the engine compartment
| Number | Ampere [A] | Description |
| 100 | 40 | Hybrid:Vacuum pump |
| 101 | 15 | Except AMG:connecting sleeve, circuit 87/2 |
| 20 | AMG:connecting sleeve, circuit 87/2 | |
| 102 | 20 | Except AMG:connecting sleeve, circuit 87/1 |
| 25 | AMG:connecting sleeve, circuit 87/1 | |
| 103 | 15 | Except AMG:connecting sleeve, circuit 87/4 |
| 20 | AMG:connecting sleeve, circuit 87/4 | |
| 104 | 15 | Except AMG:connecting sleeve, circuit 87/3 |
| 20 | AMG:connecting sleeve, circuit 87/3 | |
| 105 | 15 | Valid for 722.9 exchange (except 722.930):Automatic transmission auxiliary oil pump control unit |
| 106 | – | Reserve |
| 107 | 60 | Valid with 274.9 engine: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 | Windshield wiper motor |
| 110 | 20 | Static LED headlight:Left front headlight |
| High performance LED, dynamic LED headlight: left front headlight; right front headlight. | ||
| 111 | 30 | Appetizers |
| 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 | 87 C2 circuit connector sleeve |
| 120 | 5 | Except AMG:87 C1 circuit connector sleeve |
| 15 | AMG:87 C1 circuit connector sleeve | |
| 121 | 5 | Electronic control unit of the stability program |
| 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 petrol engine: ME-SFI control unit. |
| 127 | 5 | Hybrid:voltage decay limiter |
| 128 | 5 | Left front light cluster and external light switch |
| 129 | 30 | Hybrid:Starter circuit relay 50 |
| 129A | 30 | Hybrid:Starter circuit relay 50 |
| relay | ||
| G | Relay 15 in engine compartment | |
| H. | Starter relay 50 | |
| I. | Hybrid:vacuum pump relay (+) | |
| J | CPC Relay | |
| K. | Valid for 722.9 exchange rate (except 722.930):Oil pump relay | |
| I. | Horn relay | |
| M. | Windshield wiper park position heater relay | |
| N | Relay circuit 87M. | |
| O | Hybrid:Starter circuit relay 15 | |
| P | Valid with 274.9 engine:Liquid Cooling Pump Relay | |
| Q | Hybrid:vacuum pump relay (-) | |
| R | AIRmatic Relay | |
Fuse box in passenger footwell
| Number | Ampere [A] | Description |
| 301 | 5 | Hybrid:pyrofusion through a high voltage disconnect device |
| 302 | 30 | Front right door control unit |
| 303 | 30 | W205, S205, V205: Rear left door control unit ;A205, C205:Rear driver . |
| 304 | 20 | Gearbox 722:Intelligent servo module for DIRECT SELECT |
| 305 | 30 | Driver seat controller;Driver’s seat heating regulator;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 support control unit |
| 308 | 30 | US Version:Electrical connector for electric brake control |
| 309 | 10 | Emergency call system control unit |
| 5 | HERMES control unit;Telematics services communication module. | |
| 310 | 20 | AMG:Active engine support control unit |
| 311 | 10 | Electronic control of the 20lator Booster |
| 312 | 10 | Suspended control unit |
| 313 | 10 | Hybrid:electronic power control unit |
| 314 | 5 | AMG:Electronic differential control unit |
| 315 | 5 | Powertrain control unit ; Valid for diesel engine:CDI control unit;Valid for petrol engine:ME-SFI control unit |
| 316 | 7.5 | Supplemental restraint system control unit |
| 317 | 30 | Panoramic sunroof control module;Control module for sliding roof. |
| 318 | 20 | Fixed 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 communications |
| 322 | 20 | Main unit |
| 323 | 5 | Parking system control unit |
| MF1 / 1 | 7.5 | Audio/COMAND display;20lator motor for audio equipment. |
| MF1 / 2 | 7.5 | Multifunctional stereo camera;Multifunctional mono 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’s seat heating regulator;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 light module control unit |
| MF2 / 1 | 5 | Front left reversible emergency tensioner |
| MF2 / 2 | 5 | Audio control panel/COMAND;Touchpad. |
| MF2 / 3 | 5 | Front right reversible emergency tension spreader |
| MF2 / 4 | 5 | Pop-up display |
| MF2 / 5 | 5 | Multimedia connection unit |
| MF2 / 6 | 5 | Hybrid:electric refrigerant compressor |
| MF3 / 1 | 5 | Feedback line , 30g clamp, front SAM control unit |
| MF3 / 2 | 5 | Radar sensor 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 control unit |
Fuse box in the trunk
option 1
Variant 2
1 – Terminal 30 Power supply “E1”
2 – 30g terminal Power supply “E2”
| Number | Ampere [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’s seat, semi-electric seat adjustment switch |
| 25 | Valid from 01/12/2015:Driver’s seat, semi-electric seat adjustment switch | |
| 405 | – | Reserve |
| 406 | 30 | Front left door control unit |
| 407 | – | Reserve |
| 408 | 30 | W205, S205, V205: Rear right door control unit ;A205, C205:Rear driver. |
| 409 | – | Reserve |
| 410 | 5 | Fixed radio receiver for remote control of the heater;Antenna switch for telephone and independent heating. |
| 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 atomizer generator. |
| 416 | 7.5 | Antenna amplifier/compensator for a cellular telephone system;Cell 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 | Audio system amplifier control unit |
| 424 | 15 | AIR BODY CONTROL Plus control unit;Valid for 276 engine:Engine sound control unit. |
| 425 | – | Reserve |
| 426 | – | Reserve |
| 427 | – | Reserve |
| 428 | – | Reserve |
| 429 | – | Reserve |
| 430 | – | Reserve |
| 431 | 25 | Multifunction control unit for special vehicles |
| 432 | 25 | Multifunction control unit for special vehicles |
| 433 | 15 | Trailer recognition control unit |
| 434 | 15 | Trailer recognition control unit |
| 30 | AMG:Electronic 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 | Power system control unit |
| 443 | 30 | Front right reversible emergency tension spreader |
| 444 | 15 | Electrical connector for tablet pc |
| 445 | 15 | S205: Boot socket |
| 446 | 15 | Front cigarette lighter with ashtray illumination;Vehicle internal power socket. |
| 447 | 15 | 12V socket in the right centre console |
| 448 | 10 | Valid for transmission 722, 725:Ratchet capacitor |
| 449 | 5 | Valid for 626 engine:Fuel filter element with integrated heater;AMG:Electric parking brake control unit. |
| 450 | 5 | Rear SAM control unit |
| 451 | 5 | BlueTEC power system control unit: AdBlue® control unit |
| 452 | 5 | Integrated radar sensor for the right rear outer bumper;Integrated radar sensor for left rear bumper outside;Rear bumper center radar sensor;Rear Right External Radar Sensor;Left rear bumper external radar sensor. |
| 453 | 5 | Front left bumper radar sensor;Front right bumper radar sensor;Driver ASSIST COLLISION PREVENTION. |
| 454 | 7.5 | Valid for transmission 722:In the fully integrated gearbox control unit |
| 5 | Driving school package:footwell light switch;Pedal operation monitoring switch;BlueTEC: AdBlue® control unit . | |
| 455 | 5 | DC/AC converter control unit |
| 456 | 5 | Long-range front radar sensor;DISTRONIC electrical controller. |
| 457 | 5 | Hybrid:Electronic power control unit;Battery management system control unit;AMG:Electronic differential control unit;Control unit with active engine support. |
| 458 | 5 | Rear switch module |
| 459 | 5 | Hybrid:charger;AMG:AMG suspension control unit. |
| 460 | 10 | KEYLESS-GO control unit |
| 461 | 5 | Antenna amplifier FM 1, AM, CL [ZV] and KEYLESS-GO |
| 462 | 40 | Audio system amplifier control unit |
| 463 | 30 | W205, S205, V205:Rear window heating via rear window anti-interference condenser;A205, C205:Hood / electrical connector inside the vehicle. |
| 464 | 40 | Trunk lid control unit;Tailgate controller. |
| 465 | 40 | Rear SAM control unit |
| 466 | 40 | Rear SAM control unit |
| 467 | 40 | Valid for 626 engine:Fuel filter element with integrated heater;A205:Rear control unit. |
| relay | ||
| S | Vehicle internal circuit relay 15 | |
| T. | Rear window heating relay | |
| U | Cup holder and second row relay socket | |
| V | BlueTEC : AdBlue® relay | |
| X | 1st row of seats / trunk refrigerator box and socket relay | |
| Y | Replacement relay | |
| ZR1 | Valid for 626 engine:Fuel Filter Heater Relay | |
| ZR2 | Backup relay | |
| ZR3 | Backup relay | |
Inner pre-box
F32/4k2 – Relay for switching off the closed circuit
| Number | Ampere [A] | Description |
| 1 | – | Engine compartment pre-fuse box |
| 2 | 150 | Hybrid:Additional battery relay for ECO start/stop function |
| 3 | 40 | 20lator regulator |
| 4 | – | Reserve |
| 5 | 150 | Valid for diesel engine:PTC heater amplifier |
| 6 | 80 | Fuse box on 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 gearbox control unit |
| 100 | Hybrid:In the fully integrated gearbox control unit | |
| 11 | – | Reserve |
| 12 | 40 | Rear fuse and relay module |
| 13 | 50 | Fuse box on right A-pillar. |
Pre-fuse box in the engine compartment
option 1
Variant 2
F32 / 3k1 – Decoupling relay
| Number | Ampere [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 to the electrical system |
| 5 | 150 | Engine fuse and relay module |
| 6 | 125 | Left fuse and relay module |
| 7 | 80 | 20lator motor (600W / 850W) |
| 8 | 125 | Electric power steering control unit |
| 9 | 150 | 20lator motor (1000 W) |
| 10 | 200 | Pre-box inside the vehicle |
| 11 | – | Reserve |
| 12 | – | Hybrid:Electronic power control unit;With 651.9 engine and USA version:Catalytic converter heater control unit. |
| 13 | 400 | Alternator |
| F1 | – | Hybrid:decoupling relay |
| F2 | – | Hybrid:circuit 31 |
| C3 / 1 | 40 | Except AMG:Electronic stability program control unit |
| C3 / 2 | 60 | Electronic control unit of the stability program |
Mercedes-Benz Classe C W205 (2015-2021) fuses and relays. Mercedes-Benz Classe C W205 (2015-2021) fuse diagram.