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Mercedes-Benz S-Class (a217) (2014 - 2018) – fuse box diagram

avatar Jonathan Yarden Oct 06, 2021 · 5 min. read

In this article you will find a description of fuses and relays Mercedes-Benz, with photos of block diagrams and their locations. Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.

Year of production: 2014, 2015, 2016, 2017, 2018

Fuse and relay box in engine compartment

Mercedes-Benz S-Class - (w222) - fuse box diagram - engine compartment

Number Fused function Ampers
100 Hybrid: Vacuum pump 40
101 Connector sleeve, circuit 87/2 15
102 Connector sleeve, circuit 87/2 20
103 Connector sleeve, circuit 87M4 15
104 Connector sleeve, circuit 87M3 15
105 Valid for transmission 722.9: Transmission oil auxiliary pump control unit 15
106 Wiper park position heater 25
107 Valid for engine 277, 279: Starter/air pump electrical connection 60
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
20
109 Wiper motor 30
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
20
111 Starter 30
112 Engine fuse and relay module 5
113 Spare —
114 AIRmatic compressor 40
115 Left fanfare horn
Right fanfare horn
15
116 Hybrid: Vacuum pump relay 5
117 Spare —
118 Hybrid: Electronic Stability Program control unit 5
119 Circuit 87/C2 connector sleeve 15
120 Circuit 87/C1 connector sleeve 7,5
121 Electronic Stability Program control unit 5
122 Hybrid: HYBRID relay 5
123 Night View Assist control unit 5
124 Hybrid: Vehicle interior and engine compartment electrical connector 5
125 Front SAM control unit 5
126 Powertrain control uni
Valid for diesel engine: CDI control unit
Valid for gasoline engine: ME-SFI [ME] control unit
5
127 Spare —
128 Exterior lights switch 5
129A Hybrid: Starter circuit 50 relay 30
129B Valid except Hybrid: Starter circuit 50 relay 30
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

The Instrument Panel Fuse Panel

Mercedes-Benz S-Class - (w222) - fuse box diagram - instrument panel

Number Fused function Ampers
200 Front SAM control unit 40
201 Front SAM control unit 40
202 Alarm siren 5
203 W222: Driver seat heater control unit 30
204 Diagnostic connector 5
205 Electronic ignition lock control unit 7,5
206 Analog clock 5
207 Climate control control unit 20
208 Instrument cluster 7,5
209 Front climate control operating unit 5
210 Steering column tube module control unit 10
211 Spare —
212 Spare —
213 Electronic Stability Program control unit 25
214 Spare —
215 Spare —
216 Spare —
217 Japanese version: Dedicated Short-Range Communications control unit 5
218 Supplemental restraint system control unit 5
219 Weight sensing system (WSS) control unit
Front passenger seat occupied recognition and ACSR
5
220 MAGIC VISION CONTROL relay 15
Relay
D MAGIC VISION CONTROL relay
E Backup relay
F Relay, circuit 15R

Fuse box in the front-passenger footwell

Mercedes-Benz S-Class (w222) - fuse box diagram - front passenger footwell

  1. Circuit 30 “E1” connection
  2. Circuit 30g “E2” connection
Number Fused function Ampers
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 30
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

Fuse and relay box in rear

Mercedes-Benz S-Class (w222) - fuse box diagram - relay box (rear)

  1. Circuit 30 “E1” connection
  2. Circuit 30g “E2” connection
Number Fused function Ampers
400 Parking system control unit (Active Parking Assist or code 360-degree camera) 10
401 Trunk lid control control unit 5
402 Rear entertainment controller unit 7,5
403 Spare —
404 Armrest heater control unit 7,5
405 Sound system amplifier control unit
Left front door tweeter control unit
Right front door tweeter control unit
7,5
406 Spare —
407 Spare —
408 Tuner unit 5
409 360° camera control unit
Reversing camera
5
410 Camera cover control unit 5
411 Tire pressure monitor control unit 5
412 Rear seat heater control unit 7,5
413 Left rear display
Right rear display
10
414 Rear cellular telephone system antenna amplifier/compensator
Rear mobile phone cradle
Rear mobile phone contact plate
Telephone module with Bluetooth® (SAP profile)
7,5
415 Spare —
416 Spare —
417 Trailer recognition control unit 20
418 Spare —
419 Spare —
420 DC/AC converter control unit 30
421 Multicontour seat pneumatic pump 30
422 W222: Right rear door control unit 30
423 Spare —
424 Rear SAM control unit 40
425 Spare —
426 Bass speaker amplifier 30
427 Armrest heater control unit 20
428 Trailer recognition control unit 15
429 Rear cup holder 10
430 Cigarette lighter with ashtray illumination, rear
Cigarette lighter with rear center console illumination
Left rear center console socket 12V (ashtray package/smoker package)
15
431 Rear backrest refrigerator box 15
432 Rear SAM control unit 10
433 AdBlue® control unit 25
434 AdBlue® control unit 15
435 AdBlue® control unit 20
436 Rear cup holder 20
437 Spare —
438 C217 with engine 157: Right exhaust flap actuator motor 7,5
439 C217 with engine 157: Left exhaust flap actuator motor 7,5
440 Spare —
441 Spare —
442 Spare —
443 Spare —
444 Spare —
445 Stationary heater radio remote control receiver 5
446 FM 1, AM, CL [ZV] and KEYLESS-GO antenna amplifier 5
447 Hybrid: Battery management system control unit 7,5
448 Spare —
449 Spare —
450 Spare —
451 Trailer socket 15
452 Left rear bumper radar sensor
Right rear bumper radar sensor
Center rear bumper radar sensor
5
453 Left front bumper radar sensor
Right front bumper radar sensor
COLLISION PREVENTION ASSIST controller unit
5
454 AdBlue® control unit
Fuel system control unit
5
455 Fully integrated transmission control controller unit 15
456 Spare —
457 Valid for lithium-ion battery: Starter battery capacitor 7,5
458 Spare —
459 Spare —
460 Front cigarette lighter with ashtray illumination 15
461 Right rear center console socket 12V
Socket 12V
DC/AC converter control unit
15
462 Luggage compartment socket 15
463 Spare —
464 Trailer recognition control unit 20
465 Electric parking brake control unit 30
466 Left front door control unit 30
467 KEYLESS-GO control unit 10
468 Electric parking brake control unit 30
469 Fuel system control unit 25
470 Left rear seat heater control unit
Rear seat heater control unit
30
471 Right rear seat heater control unit 30
472 C217, A217: Rear control unit 30
473 Trailer recognition control unit 20
475 Sound system amplifier control unit 40
476 Sound system amplifier control unit 40
477 Active belt buckle control unit
C217, A217: Rear control unit
40
478 Left rear seat control unit 30
479 Active belt buckle control unit 40
480 Right rear seat control unit 30
481 Left front reversible emergency tensioning retractor 5
482 W222: MAGIC SKY CONTROL control unit 5
C217, A217: MAGIC SKY CONTROL control unit 7,5
483 Right front reversible emergency tensioning retractor 5
484 Right rear seat control unit
Left rear seat control unit
7,5
485 Active belt buckle control unit 5
486 Hybrid:
Battery management system control unit
Power electronics control unit
10
487 Electric parking brake control unit 5
488 Rear SAM control unit 5
489 Front long-range radar sensor 5
490 Multicontour seat pneumatic pump 5
491 Trunk lid control control unit 40
492 Right front reversible emergency tensioning retractor 40
493 Spare —
494 Rear SAM control unit 40
495 Rear window heater 40
496 Left front reversible emergency tensioning retractor 40
Relay
S Vehicle interior circuit 15 relay
T Rear window heater relay
U 2nd seat row cupholder and sockets relay
V AdBlue® relay
W Circuit 15R relay
X 1 st seat row/trunk refrigerator box and sockets relay
Y Spare relay

Engine compartment prefuse box

View from below

Mercedes-Benz S-Class (w222) - fuse box diagram - engine compartment prefuse (view from below)

View from above

Mercedes-Benz S-Class (w222) - fuse box diagram - engine compartment prefuse (view from above)

1 – Connection, circuit 30 “B1”
2 – Connection, circuit 30 unlatched “B2”

Number Fused function Ampers
M3 Hybrid: Electrical machine 500
Valid except Hybrid: Alternator 500
M1 Hybrid: Electrical machine —
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 —

Vehicle interior prefuse box

Mercedes-Benz S-Class (w222) - fuse box diagram - vehicle interior prefuses

F32/4k2 – Quiescent current cutout relay

Number Fused function Ampers
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

Rear prefuse box

Mercedes-Benz S-Class (w222) - fuse box diagram - rear prefuses box

F33k1 – Decoupling relay
F33k2 – ECO start/stop function additional battery relay

Number Fused function Ampers
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 —

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

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