Mercedes-Benz S-Class (2014 – 2020) Fuse Box Location & Diagrams
Finding the fuse boxes and understanding fuse layouts is essential for diagnosing electrical issues in the Mercedes-Benz S-Class (2014–2020). This article provides clear fuse box locations, detailed diagrams, and fuse assignment information to help owners quickly identify and replace the correct fuse when needed.
Fuse Box Location
Passenger Compartment Fuse Box
Instrument Panel Fuse Box
The fuse box is located on the left side of the instrument panel, behind the cover.
Fuse Box in the Front-passenger Footwell
Interior Pre-fuse Box
Luggage Compartment Fuse Box
It is located on the right side of the luggage compartment, behind the lid.
Rear Pre-fuse Box
Engine Compartment Fuse Box
It is located in the engine compartment (left-side), under cover.
Engine Pre-Fuse Box
Fuse Box Diagrams
Passenger Compartment Fuse Box
Instrument Panel Fuse Box
Mercedes-Benz S-Class (2014 – 2020)
| № | Fused function |
| 200 | Front SAM control unit |
| 201 | Front SAM control unit |
| 202 | Alarm siren |
| 203 | W222: Driver seat heater control unit |
| 204 | Diagnostic connector |
| 205 | Electronic ignition lock control unit |
| 206 | Analog clock |
| 207 | Climate control control unit |
| 208 | Instrument cluster |
| 209 | Front climate control operating unit |
| 210 | Steering column tube module control unit |
| 211 | Spare |
| 212 | Spare |
| 213 | Electronic Stability Program control unit |
| 214 | Spare |
| 215 | Spare |
| 216 | Spare |
| 217 | Japanese version: Dedicated Short-Range Communications control unit |
| 218 | Supplemental restraint system control unit |
| 219 | Weight sensing system (WSS) control unit Front passenger seat occupied recognition and ACSR |
| Relay | |
| D | MAGIC VISION CONTROL relay |
| E | Backup relay |
| F | Relay, circuit 15R |
Fuse Box in the Front-passenger Footwell
Mercedes-Benz S-Class (2014 – 2020)
| № | Fused function | Amp |
|---|---|---|
| 1 | Circuit 30 “E1” connection | |
| 2 | Circuit 30g “E2” connection | |
| 301 | Mirror taximeter | 5 |
| 302 | Right front door control unit | 30 |
| 303 | W222: Left rear door control unit C217, A217: Rear control unit | 30 |
| 304 | W222: Right rear door control unit C217, A217: Rear control unit | 30 |
| 305 | Driver seat control unit | 30 |
| 306 | Front passenger seat control unit | 30 |
| 307 | W222: Intelligent servo module for DIRECT SELECT | 20 |
| 307 | C217, A217: Driver seat heater control unit | 30 |
| 308 | Front passenger seat heater control unit | 30 |
| 309 | Emergency call system control unit Telematics services communications module HERMES control unit | 5 |
| 310 | Stationary heater control unit | 25 |
| 311 | Rear blower motor | 10 |
| 312 | Overhead control panel control unit | 10 |
| 313 | Hybrid and Hybrid Plus: Power electronics control unit | 10 |
| 314 | A217: Antitheft alarm system (designation in coordination) | 7.5 |
| 315 | Powertrain control unit Valid for gasoline engine: ME-SFI control unit Valid for engine 642, 651: CDI control unit | 10 |
| 316 | Spare | – |
| 317 | W222: Panoramic sliding sunroof control module C217, A217: MAGIC SKY CONTROL control unit | 30 |
| 318 | Audio/COMAND display | 15 |
| 319 | Panoramic sliding sunroof control module C217, A217: Panoramic roof roller sun blind control module | 30 |
| 320 | Active Body Control control unit AIRmatic control unit (Valid except Active Body Control) | 15 |
| 321 | C217, A217: Intelligent servo module for DIRECT SELECT | 20 |
| 322 | COMAND controller unit | 15 |
| 323 | Supplemental Restraint System control unit | 7.5 |
| MF1/1 | Japan version: Dedicated Short-Range Communications control unit | 7.5 |
| MF1/2 | Mono multifunction camera Stereo multifunction camera | 7.5 |
| MF1/3 | Rain/light sensor with additional functions Overhead control panel control unit | 7.5 |
| MF1/4 | Driver seat control unit | 7.5 |
| MF1/5 | Front passenger seat control unit | 7.5 |
| MF1/6 | Steering column tube module control unit | 7.5 |
| MF2/1 | Perfume atomizer generator | 5 |
| MF2/2 | Audio/COMAND control panel Touchpad | 5 |
| MF2/3 | Electronic Stability Program control unit | 5 |
| MF2/4 | Heads-up display | 5 |
| MF2/5 | Hybrid and Hybrid Plus: Electrical refrigerant compressor | 5 |
| MF2/6 | Spare | – |
| MF3/1 | Front SAM control unit | 5 |
| MF3/2 | Radar sensors control unit | 5 |
| MF3/3 | COMAND fan motor | 5 |
| MF3/4 | Driver side instrument panel button group Center instrument panel button group | 5 |
| MF3/5 | Rear air conditioning operating unit | 5 |
| MF3/6 | as of 01.06.2016: Antenna changeover switch for telephone and stationary heater | 5 |
Interior Pre-fuse Box
Mercedes-Benz S-Class (2014 – 2020)
| № | Fused function | Amp |
|---|---|---|
| I7 | Right A-pillar fuse box | 125 |
| I2 | Left fuse and relay module | 125 |
| C2 | Spare | – |
| I8 | Spare | – |
| I9 | Spare | – |
| I3 | No-load current shutoff relay connection | – |
| C1 | Blower regulator | 40 |
| I1 | Electronic Stability Program control unit | 40 |
| I4 | Spare | – |
| I6 | Rear fuse and relay module | 60 |
| I5 | Right A-pillar fuse box | 60 |
| F32/4k2 | Quiescent current cutout relay |
Luggage Compartment Fuse Box
Luggage Fuse Box
| № | Fused function |
| 1 | Circuit 30 “E1” connection |
| 2 | Circuit 30g “E2” connection |
| 400 | Parking system control unit (Active Parking Assist or code 360-degree camera) |
| 401 | Trunk lid control control unit |
| 402 | Rear entertainment controller unit |
| 403 | Spare |
| 404 | Armrest heater control unit |
| 405 | Sound system amplifier control unit Left front door tweeter control unit Right front door tweeter control unit |
| 406 | Spare |
| 407 | Spare |
| 408 | Tuner unit |
| 409 | 360° camera control unit Reversing camera |
| 410 | Camera cover control unit |
| 411 | Tire pressure monitor control unit |
| 412 | Rear seat heater control unit |
| 413 | Left rear display Right rear display |
| 414 | Rear cellular telephone system antenna amplifier/compensator Rear mobile phone cradle Rear mobile phone contact plate Telephone module with Bluetooth® (SAP profile) |
| 415 | Spare |
| 416 | Spare |
| 417 | Trailer recognition control unit |
| 418 | Spare |
| 419 | Spare |
| 420 | DC/AC converter control unit |
| 421 | Multicontour seat pneumatic pump |
| 422 | W222: Right rear door control unit |
| 423 | Spare |
| 424 | Rear SAM control unit |
| 425 | Spare |
| 426 | Bass speaker amplifier |
| 427 | Armrest heater control unit |
| 428 | Trailer recognition control unit |
| 429 | Rear cup holder |
| 430 | Cigarette lighter with ashtray illumination, rear Cigarette lighter with rear center console illumination Left rear center console socket 12V (ashtray package/smoker package) |
| 431 | Rear backrest refrigerator box |
| 432 | Rear SAM control unit |
| 433 | Ad Blue® control unit |
| 434 | Ad Blue® control unit |
| 435 | Ad Blue® control unit |
| 436 | Rear cup holder |
| 437 | Spare |
| 438 | C217 with engine 157: Right exhaust flap actuator motor |
| 439 | C217 with engine 157: Left exhaust flap actuator motor |
| 440 | Spare |
| 441 | Spare |
| 442 | Spare |
| 443 | Spare |
| 444 | Spare |
| 445 | Stationary heater radio remote control receiver |
| 446 | FM 1, AM, CL [ZV] and KEYLESS-GO antenna amplifier |
| 447 | Hybrid: Battery management system control unit |
| 448 | Spare |
| 449 | Spare |
| 450 | Spare |
| 451 | Trailer socket |
| 452 | Left rear bumper radar sensor Right rear bumper radar sensor Center rear bumper radar sensor |
| 453 | Left front bumper radar sensor Right front bumper radar sensor COLLISION PREVENTION ASSIST controller unit |
| 454 | Ad Blue® control unit Fuel system control unit |
| 455 | Fully integrated transmission control controller unit |
| 456 | Spare |
| 457 | Valid for lithium-ion battery: Starter battery capacitor |
| 458 | Spare |
| 459 | Spare |
| 460 | Front cigarette lighter with ashtray illumination |
| 461 | Right rear center console socket 12V Socket 12V DC/AC converter control unit |
| 462 | Luggage compartment socket |
| 463 | Spare |
| 464 | Trailer recognition control unit |
| 465 | Electric parking brake control unit |
| 466 | Left front door control unit |
| 467 | KEYLESS-GO control unit |
| 468 | Electric parking brake control unit |
| 469 | Fuel system control unit |
| 470 | Left rear seat heater control unit Rear seat heater control unit |
| 471 | Right rear seat heater control unit |
| 472 | C217, A217: Rear control unit |
| 473 | Trailer recognition control unit |
| 475 | Sound system amplifier control unit |
| 476 | Sound system amplifier control unit |
| 477 | Active belt buckle control unit C217, A217: Rear control unit |
| 478 | Left rear seat control unit |
| 479 | Active belt buckle control unit |
| 480 | Right rear seat control unit |
| 481 | Left front reversible emergency tensioning retractor |
| 482 | W222: MAGIC SKY CONTROL control unit |
| 482 | C217, A217: MAGIC SKY CONTROL control unit |
| 483 | Right front reversible emergency tensioning retractor |
| 484 | Right rear seat control unit Left rear seat control unit |
| 485 | Active belt buckle control unit |
| 486 | Hybrid: Battery management system control unit, Power electronics control unit |
| 487 | Electric parking brake control unit |
| 488 | Rear SAM control unit |
| 489 | Front long-range radar sensor |
| 490 | Multicontour seat pneumatic pump |
| 491 | Trunk lid control control unit |
| 492 | Right front reversible emergency tensioning retractor |
| 493 | Spare |
| 494 | Rear SAM control unit |
| 495 | Rear window heater |
| 496 | Left front reversible emergency tensioning retractor |
| Relay | |
| S | Vehicle interior circuit 15 relay |
| T | Rear window heater relay |
| U | 2nd seat row cupholder and sockets relay |
| V | Ad Blue relay |
| W | Circuit 15R relay |
| X | 1-st seat row/trunk refrigerator box and sockets relay |
| Y | Spare relay |
Rear Pre-fuse Box
Mercedes-Benz S-Class (2014 – 2020)
| № | Fused function | Amp |
|---|---|---|
| I3 | Spare | – |
| I2 | Windshield heater control unit | 125 |
| I7 | Hybrid: High-voltage disconnect device | 7.5 |
| I4 | Rear fuse and relay module | 150 |
| I6 | ECO start/stop function additional battery | 200 |
| I7 | ECO start/stop function additional battery Front SAM control unit Electronic ignition lock control unit | 10 |
| I1 | Spare | – |
| I11 | Spare | – |
| I7 | Front SAM control unit | 10 |
| I8 | ECO start/stop function additional battery relay connection | – |
| I5 | Hybrid: High-voltage pyrofuse triggered by Supplemental Restraint System control unit | – |
| I9 | Decoupling relay connection | – |
| F33k1 | Decoupling relay | |
| F33k2 | ECO start/stop function additional battery relay |
Engine Compartment Fuse Box
Engine Fuse Box
Mercedes-Benz S-Class (2014 – 2020)
| № | Fused function |
| 100 | Hybrid: Vacuum pump |
| 101 | Connector sleeve, circuit 87/2 |
| 102 | Connector sleeve, circuit 87/2 |
| 103 | Connector sleeve, circuit 87M4 |
| 104 | Connector sleeve, circuit 87M3 |
| 105 | Valid for transmission 722.9: Transmission oil auxiliary pump control unit |
| 106 | Wiper park position heater |
| 107 | Valid for engine 277, 279: Starter/air pump electrical connection |
| 108 | Valid for SAE dynamic LED headlamp for right-hand traffic or Dynamic LED headlamp: Left front lamp unit, Right front lamp unit Valid without SAE dynamic LED headlamp for right-hand traffic or Dynamic LED headlamp:: Right front lamp unit |
| 109 | Wiper motor |
| 110 | Valid for code SAE dynamic LED headlamp for right-hand traffic or Dynamic LED headlamp: Left front lamp unit, Right front lamp unit Valid without SAE dynamic LED headlamp for right-hand traffic or Dynamic LED headlamp:: Left front lamp unit |
| 111 | Starter |
| 112 | Engine fuse and relay module |
| 113 | Spare |
| 114 | AIRmatic compressor |
| 115 | Left fanfare horn Right fanfare horn |
| 116 | Hybrid: Vacuum pump relay |
| 117 | Spare |
| 118 | Hybrid: Electronic Stability Program control unit |
| 119 | Circuit 87/C2 connector sleeve |
| 120 | Circuit 87/C1 connector sleeve |
| 121 | Electronic Stability Program control unit |
| 122 | Hybrid: HYBRID relay |
| 123 | Night View Assist control unit |
| 124 | Hybrid: Vehicle interior and engine compartment electrical connector |
| 125 | Front SAM control unit |
| 126 | Powertrain control unit Valid for diesel engine: CDI control unit Valid for gasoline engine: ME-SFI [ME] control unit |
| 127 | Spare |
| 128 | Exterior lights switch |
| 129A | Hybrid: Starter circuit 50 relay |
| 129B | Valid except Hybrid: Starter circuit 50 relay |
| Relay | |
| G | Engine compartment circuit 15 relay |
| H | Starter circuit 50 relay |
| I | Brake vacuum pump relay |
| J | Hybrid: HYBRID relay |
| K | Transmission oil pump relay |
| L | Horn relay |
| M | Wiper park position heater relay |
| N | Circuit 87M relay |
| O | Valid except Hybrid: Starter circuit 15 relay |
| P | Secondary air injection relay |
| Q | Hybrid: Vacuum pump relay |
| R | AIRmatic relay |
Engine Pre-Fuse Box
Mercedes-Benz S-Class (2014 – 2020)
| № | Fused function | Amp |
|---|---|---|
| 1 | Connection, circuit 30 “B1” | |
| 2 | Connection, circuit 30 unlatched “B2” | |
| M3 | Hybrid: Electrical machine | 500 |
| M3 | Valid except Hybrid: Alternator | 500 |
| M1 | Hybrid: Electrical machine | – |
| M1 | Valid except Hybrid: Starter | – |
| MR5 | Electrical power steering control unit | 100 |
| MR2 | Fan motor | 100 |
| M4 | Hybrid: Fully integrated transmission control controller unit | 100 |
| I1 | Spare | – |
| M2 | Valid for diesel engine: Glow output stage | 150 |
| MR1 | Motor fuse and relay module | 60 |
| MR3 | Spare | – |
| MR4 | Valid for engine 277, 279: Fan motor | 150 |
| I2 | Spare | – |
