Mercedes W221 fuse and relay

Mercedes w221 is the fifth generation of the Mercedes-Benz S-class, produced in 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 and 2013 with various versions of the S350, S450, S500, S600, S65 AMG, S63. During this time, the model has been restyled. Our information will also be useful to owners of Mercedes-Benz C216 (CL-class) since these cars are made on a common basis. We will present a detailed description of the Mercedes 221 fuses and relays with box diagrams and their locations. Select the fuses that are responsible for the cigarette lighter.

Mercedes 221

The location of the boxes and the purpose of the elements in them may differ from those shown and depend on the year of manufacture and the level of equipment of your car.

Engine compartment

Location

Layout of boxes under the hood of a Mercedes 221

location EC

Assignment

  • F32/3 – Power fuse box
  • N10/1 – Main fuse and relay box
  • K109 (K109/1) – Vacuum pump relay

Fuse and relay box

It is located on the left side, next to the stand and is covered with a protective cover.

Photo – example

Photo 1

Diagram

Diagram 1

Designation

2010A CDI system control unit
ME control unit
2120A Cable lug electr. circuit terminal 87 M1i
CDI system control unit
Fuel pump relay
Dosing valve
2215A Cable lug electr. terminal 87 circuits
2320A Cable lug electr. terminal 87 circuits
Cable lug electr. circuit terminal 87 M2e
Cable lug electr. circuit terminal 87 M2i
SAM control unit with fuse and relay module in the rear
2425A Cable lug electr. circuit terminals 87M1e
CDI system control unit
257.5A Instrument cluster
2610A Front left headlight
2710A Front right headlight
287.5A
EGS control unit
Control unit integrated in the automatic transmission (VGS)
295A SAM control unit with fuse and relay module in the rear
307.5A CDI system control unit
ME control unit
Fuel pump control unit
315A S 400 Hybrid: Electric A/C Compressor
3215A Additional gearbox oil pump control unit
335A From 1.9.10: ESP control unit
S 400 Hybrid:
Battery management system unit
DC/DC converter control unit
Power electronics control unit
345A S 400 Hybrid: Brake Energy Regeneration control unit
355A Electric parking brake control unit
3610A Diagnostic socket
377.5A EZS control unit
387.5A Central interface control unit
397.5A Instrument cluster
407.5A Upper control box
4130A Slave wiper motor
4230A Wiper main motor
4315A Cigarette lighter, front
44Reserve
455A S 400 Hybrid:
Circulation pump 1 power electronics
4615A ABC control unit (Active Body Level Control)
AIRMATIC control unit with ADS
4715A Steering column adjustment motor up and down
4815A Steering column adjustment motor forward and backward
4910A Electronic steering column module
5015A KLA control unit
515A COMAND display
SPLITVIEW (Split View System) Display
52a15A W221:
Left horn
Right horn
52b15A W221, C216:
Left horn
Right horn
53Reserve
5440A Climate air recirculation unit
5560A Gasoline engines: Electric air pump
5640A AIRmatic compressor unit
5730A Heated wiper blades
605A Electro-hydraulic power steering
617.5A Restraint control unit
625A Night vision control unit
6315A Fuel filter condensation sensor with heating element
6410A W221:
NECK-PRO head restraint solenoid coil on the back of the driver’s seat
NECK-PRO head restraint solenoid coil on the back of the right front seat
6515A Valid from 1.6.09: 12 V plug connection in glove box
667.5A DTR control module (Distronic)
Relay
АAir pump relay
BAir Suspension Compressor Relay
Cterminal 87 relay, motor
DRelay terminal 15
ERelay, electr. circuit terminal 87 undercarriage
FHorn relay
GRelay terminal 15R
HRelay el. terminal 50 circuits, starter
JRelay el. terminal 15 circuits, starter
KRelay for heated wiper blades

For the front cigarette lighter, fuse number 43 is responsible for 15A. The rear cigarette lighter is controlled by fuses in the rear fuse and relay box.

Power fuse box

Located on the right side of the engine compartment, next to the battery.

cover fuse box

Type 1

Diagram

Type 1

Allocation

  • F32f1 – Starter 400A
  • F32f2 – Except engine 642: Alternator 150A / Engine 642: Alternator 200A
  • F32f3 – 150A
  • F32f4 – Electric suction fan for engine and air conditioner with integrated regulator 150A
  • F32f5 – Engine 642: Additional heater PTC 200A
  • F32f6 – SAM control unit with fuse and relay module, front 200A
  • F32f7 – ESP 40A control unit
  • F32f8 – ESP 25A control unit
  • F32f9 – SAM control unit with fuse and relay module, front 20A
  • F32f10 – Onboard supply control unit 7.5A

Type 2

Photo

Photo 2

Diagram

Diagram 2

Appointment

3150A SAM control unit with fuse and relay module in the rear
4150A ECO Start-Stop function relay
S 400 Hybrid: DC/DC converter control unit
Heated windshield control unit
5125A Special vehicle multifunction control unit (MSS)
40A S 400 Hybrid: Vacuum pump
680A Right front fuse box
7150A Special vehicle multifunction control unit (MSS)
Engine 629, 642, 651: PTC auxiliary heater
880A Front SAM control box with fuse and relay module
980A Left fuse box in front panel
10150A SAM control unit with fuse and relay module in the rear

Passenger compartment

Location

Layout of boxes in salon of the Mercedes 221

location

Decoding

  • F1 / 6 – Fuse box in the instrument panel, right
  • F1 / 7 – Fuse box in the instrument panel, left
  • F32/4 – Power fuse box
  • F38 – Emergency battery fuse
  • N10/2 – Rear fuse and relay box

Fuse box in the panel on the left

This fuse box is installed in the left end of the dashboard on the left, behind the protective cover.

Photo 3

Diagram

Diagram 3

Assignment

9240A Seat control unit front left
937.5A SRS control unit
Passenger Weight System (WSS) control unit (USA)
94Not used
95Not used
965A RDK control unit (tire pressure monitoring system (Siemens))
977.5A W221: Audio Video Controller Control Unit (Rear Multimedia Entertainment System)
98Not used
99Not used
100Not used
10110A Left rear display
Display right rear
10240A Seat control unit front right
1037.5A ESP control unit
10440A Audio tuner control unit
105Not used
106Electronic Toll Collection (ETC) control unit (Japan)
1075A C216: SDAR control unit
1085A Rear air conditioner control unit
10915A W221: Intermediate connector for rear electric fan
1107.5A W221:
Control unit for multi-contour backrest, rear left
Control unit for multi-contour backrest, rear right
1115A HBF control unit
1125A W221:
Front left door control unit
Front right door control unit
113Not used

Fuse box in the panel on the right

It is installed in the right end of the dashboard on the left, behind the protective cover.

Photo 4

Diagram

Diagram 4

Designation

7040A C216: Right door control unit
W221: Front right door control unit
7115A KEYLESS-GO control unit
727.5A S 400 Hybrid: Pyrotechnic disconnecting element
735A COMAND control unit (Japan)
Emergency call system control unit
7430A HDS control unit (remote tailgate closing)
7510A S 400 Hybrid:
Battery management system unit
Power electronics control unit
76Engine 642.8: AdBlue® supply relay
15A S 400 Hybrid: Vacuum pump relay (+)
7750A Acoustic Amplifier
7825A S 65 AMG with 275 engine: Additional fan relay
Engine 642.8: AdBlue® supply relay
15A Engine 157, 278; S 400 Hybrid, CL 63 AMG: Charge air cooler circulation pump
797.5A Alarm siren
8040A C216: Left door control unit
W221: Front left door control unit
8130A C216: Rear compartment systems control unit
40A W221: Rear left door control unit
8230A C216: Rear compartment systems control unit
40A W221: Rear right door control unit
8330A Automatic transmission servo drive module for “DIRECT SELECT” system
8420A Digital sound processor
8510A AMG: Illuminated treadplates
86Reserve
87Reserve
88Reserve
89Reserve
9020A C216: STH heater (auxiliary heating system)
W221: Heater STH (independent) or ZUH (additional)
915A STH auxiliary heater radio remote control receiver
S 400 Hybrid: Front SAM control unit with fuse and relay module

Rear fuse and relay box

This box is installed in the luggage compartment, behind the armrest of the rear seat. To access, lower the armrest and remove the protective cover.

Photo 5

Diagram

Diagram 5

Allocation

11550A Heated rear window
11610A Engine 157, 275, 278: Charge air cooler circulation pump
Engine 156: Engine oil cooler circulation pump
S 400 Hybrid: Circulation pump 2 power electronics
11715A Rear cigarette lighter
11830A Engine 629, 642: Fuel pump
15A S 400 Hybrid: Circulation pump 1 power electronics
15A Engine 642.8, 651 from 1.6.11: Refrigerant compressor with magnetic clutch
1197.5A Front central control panel
120Reserve
12110A Audio tuner control unit
1227,5A Control unit COMAND
12340A W221: Front right reversible seat belt pretensioner
12440A W221: Front left reversible seat belt pretensioner
1255A Voice control control unit (SBS)
12625A Ceiling Control Panel
12730A Seat back lower pump
Pneumatic pump for multicontour seat
Air pump for dynamic seat adjustment
12825A Engine 156, 157, 272, 273, 275, 276, 278, 642: Fuel pump control unit
12925A UHI (Universal Cell Phone Interface) Control Box / Ceiling Control Box
13030A Electric parking brake control unit
1317.5A Antenna amplifier module above the rear window
13315A Trailer recognition control unit
5A Rear view camera
13415A Socket in luggage compartment
1357.5A Radar control unit (SGR)
PTS control unit (PARKTRONIC)
1367.5A Engine 642.8: AdBlue® control unit
1377.5A From 1.9.10: Rear view camera
1385A Navigation processor (Taiwan, before 8/31/10)
Emergency call system control unit
TV plug/tuner connection (Japan)
13915A Refrigerated box in the back of the rear seat
14015A Cigarette lighter plug with ashtray light, rear
Socket 115 V
1415A Rear view camera control unit
Rear view camera power module
1427.5A PTS control unit (PARKTRONIC)
Radar sensor control unit (SGR)
Control unit for video sensors and radar sensors (from 1.9.10)
14325A Rear seat control unit
14425A Rear seat control unit
14520A AHV drawbar connector, 13-pin
14625A Trailer recognition control unit
147Reserve
14825A End sleeve terminal 30 panoramic sliding sunroof
14925A Panoramic sliding sunroof control module
1507.5A Combo TV tuner (analogue/digital)
TV plug/tuner connection (Japan)
15120A Trailer detection control unit 25A Electric parking brake control module
15225A DC/AC converter control unit 7.5A Antenna amplifier module above the rear window
Relay
MTerminal 15 relay (2) / reserve 1 (changeover relay)
НRelay terminal 15R
OSocket relay
PHeated rear window relay
QEngine 156, 157, 275, 278, 629: Circulation pump relay
S 400 Hybrid: Circulation pump relay 2 power electronics
Rcigarette lighter relay
SEngine 642 except 642.8: Fuel pump relay
Engine 642.8, 651 from 1.6.11: Magnetic clutch for refrigerant compressor
S 400 Hybrid: Circulation pump relay 1 power electronics

Fuse 117 and 134 are responsible for the cigarette lighter.

Power fuse box

In the cabin, on the right side of the passenger side, another power fuse box is attached.

Photo – example

Photo 6

Diagram

Diagram 6

Appointment

2400A Generator (G2)
3150A Electro-hydraulic power steering
Engine 629, 642: End of glow plug time
4F32/4 passenger compartment power fuse box
5100A Suction motor and air conditioning fan with integrated regulator
6150A Front SAM control box with fuse and relay module
740A ESP control unit
S 400 Hybrid: Brake energy regeneration control unit
825A ESP control unit
S 400 Hybrid: Brake energy regeneration control unit
925A Front SAM control box with fuse and relay module
10Reserve
Relay
F32/4k2Relay for quiescent current interruption

Additional fuses and relays of the Adblue system can also be installed in the trunk.

That’s all, if you have something to add – write in the comments.

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