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.
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.
Contents
Engine compartment
Location
Layout of boxes under the hood of a Mercedes 221
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
Diagram
Designation
| 20 | 10A CDI system control unit |
| ME control unit | |
| 21 | 20A Cable lug electr. circuit terminal 87 M1i |
| CDI system control unit | |
| Fuel pump relay | |
| Dosing valve | |
| 22 | 15A Cable lug electr. terminal 87 circuits |
| 23 | 20A 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 | |
| 24 | 25A Cable lug electr. circuit terminals 87M1e |
| CDI system control unit | |
| 25 | 7.5A Instrument cluster |
| 26 | 10A Front left headlight |
| 27 | 10A Front right headlight |
| 28 | 7.5A |
| EGS control unit | |
| Control unit integrated in the automatic transmission (VGS) | |
| 29 | 5A SAM control unit with fuse and relay module in the rear |
| 30 | 7.5A CDI system control unit |
| ME control unit | |
| Fuel pump control unit | |
| 31 | 5A S 400 Hybrid: Electric A/C Compressor |
| 32 | 15A Additional gearbox oil pump control unit |
| 33 | 5A From 1.9.10: ESP control unit |
| S 400 Hybrid: | |
| Battery management system unit | |
| DC/DC converter control unit | |
| Power electronics control unit | |
| 34 | 5A S 400 Hybrid: Brake Energy Regeneration control unit |
| 35 | 5A Electric parking brake control unit |
| 36 | 10A Diagnostic socket |
| 37 | 7.5A EZS control unit |
| 38 | 7.5A Central interface control unit |
| 39 | 7.5A Instrument cluster |
| 40 | 7.5A Upper control box |
| 41 | 30A Slave wiper motor |
| 42 | 30A Wiper main motor |
| 43 | 15A Cigarette lighter, front |
| 44 | Reserve |
| 45 | 5A S 400 Hybrid: |
| Circulation pump 1 power electronics | |
| 46 | 15A ABC control unit (Active Body Level Control) |
| AIRMATIC control unit with ADS | |
| 47 | 15A Steering column adjustment motor up and down |
| 48 | 15A Steering column adjustment motor forward and backward |
| 49 | 10A Electronic steering column module |
| 50 | 15A KLA control unit |
| 51 | 5A COMAND display |
| SPLITVIEW (Split View System) Display | |
| 52a | 15A W221: |
| Left horn | |
| Right horn | |
| 52b | 15A W221, C216: |
| Left horn | |
| Right horn | |
| 53 | Reserve |
| 54 | 40A Climate air recirculation unit |
| 55 | 60A Gasoline engines: Electric air pump |
| 56 | 40A AIRmatic compressor unit |
| 57 | 30A Heated wiper blades |
| 60 | 5A Electro-hydraulic power steering |
| 61 | 7.5A Restraint control unit |
| 62 | 5A Night vision control unit |
| 63 | 15A Fuel filter condensation sensor with heating element |
| 64 | 10A 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 | |
| 65 | 15A Valid from 1.6.09: 12 V plug connection in glove box |
| 66 | 7.5A DTR control module (Distronic) |
| Relay | |
| А | Air pump relay |
| B | Air Suspension Compressor Relay |
| C | terminal 87 relay, motor |
| D | Relay terminal 15 |
| E | Relay, electr. circuit terminal 87 undercarriage |
| F | Horn relay |
| G | Relay terminal 15R |
| H | Relay el. terminal 50 circuits, starter |
| J | Relay el. terminal 15 circuits, starter |
| K | Relay 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.
Type 1
Diagram
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
Diagram
Appointment
| 3 | 150A SAM control unit with fuse and relay module in the rear |
| 4 | 150A ECO Start-Stop function relay |
| S 400 Hybrid: DC/DC converter control unit | |
| Heated windshield control unit | |
| 5 | 125A Special vehicle multifunction control unit (MSS) |
| 40A S 400 Hybrid: Vacuum pump | |
| 6 | 80A Right front fuse box |
| 7 | 150A Special vehicle multifunction control unit (MSS) |
| Engine 629, 642, 651: PTC auxiliary heater | |
| 8 | 80A Front SAM control box with fuse and relay module |
| 9 | 80A Left fuse box in front panel |
| 10 | 150A SAM control unit with fuse and relay module in the rear |
Passenger compartment
Location
Layout of boxes in salon of the Mercedes 221
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.
Diagram
Assignment
| 92 | 40A Seat control unit front left |
| 93 | 7.5A SRS control unit |
| Passenger Weight System (WSS) control unit (USA) | |
| 94 | Not used |
| 95 | Not used |
| 96 | 5A RDK control unit (tire pressure monitoring system (Siemens)) |
| 97 | 7.5A W221: Audio Video Controller Control Unit (Rear Multimedia Entertainment System) |
| 98 | Not used |
| 99 | Not used |
| 100 | Not used |
| 101 | 10A Left rear display |
| Display right rear | |
| 102 | 40A Seat control unit front right |
| 103 | 7.5A ESP control unit |
| 104 | 40A Audio tuner control unit |
| 105 | Not used |
| 106 | Electronic Toll Collection (ETC) control unit (Japan) |
| 107 | 5A C216: SDAR control unit |
| 108 | 5A Rear air conditioner control unit |
| 109 | 15A W221: Intermediate connector for rear electric fan |
| 110 | 7.5A W221: |
| Control unit for multi-contour backrest, rear left | |
| Control unit for multi-contour backrest, rear right | |
| 111 | 5A HBF control unit |
| 112 | 5A W221: |
| Front left door control unit | |
| Front right door control unit | |
| 113 | Not 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.
Diagram
Designation
| 70 | 40A C216: Right door control unit |
| W221: Front right door control unit | |
| 71 | 15A KEYLESS-GO control unit |
| 72 | 7.5A S 400 Hybrid: Pyrotechnic disconnecting element |
| 73 | 5A COMAND control unit (Japan) |
| Emergency call system control unit | |
| 74 | 30A HDS control unit (remote tailgate closing) |
| 75 | 10A S 400 Hybrid: |
| Battery management system unit | |
| Power electronics control unit | |
| 76 | Engine 642.8: AdBlue® supply relay |
| 15A S 400 Hybrid: Vacuum pump relay (+) | |
| 77 | 50A Acoustic Amplifier |
| 78 | 25A 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 | |
| 79 | 7.5A Alarm siren |
| 80 | 40A C216: Left door control unit |
| W221: Front left door control unit | |
| 81 | 30A C216: Rear compartment systems control unit |
| 40A W221: Rear left door control unit | |
| 82 | 30A C216: Rear compartment systems control unit |
| 40A W221: Rear right door control unit | |
| 83 | 30A Automatic transmission servo drive module for “DIRECT SELECT” system |
| 84 | 20A Digital sound processor |
| 85 | 10A AMG: Illuminated treadplates |
| 86 | Reserve |
| 87 | Reserve |
| 88 | Reserve |
| 89 | Reserve |
| 90 | 20A C216: STH heater (auxiliary heating system) |
| W221: Heater STH (independent) or ZUH (additional) | |
| 91 | 5A 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.
Diagram
Allocation
| 115 | 50A Heated rear window |
| 116 | 10A Engine 157, 275, 278: Charge air cooler circulation pump |
| Engine 156: Engine oil cooler circulation pump | |
| S 400 Hybrid: Circulation pump 2 power electronics | |
| 117 | 15A Rear cigarette lighter |
| 118 | 30A 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 | |
| 119 | 7.5A Front central control panel |
| 120 | Reserve |
| 121 | 10A Audio tuner control unit |
| 122 | 7,5A Control unit COMAND |
| 123 | 40A W221: Front right reversible seat belt pretensioner |
| 124 | 40A W221: Front left reversible seat belt pretensioner |
| 125 | 5A Voice control control unit (SBS) |
| 126 | 25A Ceiling Control Panel |
| 127 | 30A Seat back lower pump |
| Pneumatic pump for multicontour seat | |
| Air pump for dynamic seat adjustment | |
| 128 | 25A Engine 156, 157, 272, 273, 275, 276, 278, 642: Fuel pump control unit |
| 129 | 25A UHI (Universal Cell Phone Interface) Control Box / Ceiling Control Box |
| 130 | 30A Electric parking brake control unit |
| 131 | 7.5A Antenna amplifier module above the rear window |
| 133 | 15A Trailer recognition control unit |
| 5A Rear view camera | |
| 134 | 15A Socket in luggage compartment |
| 135 | 7.5A Radar control unit (SGR) |
| PTS control unit (PARKTRONIC) | |
| 136 | 7.5A Engine 642.8: AdBlue® control unit |
| 137 | 7.5A From 1.9.10: Rear view camera |
| 138 | 5A Navigation processor (Taiwan, before 8/31/10) |
| Emergency call system control unit | |
| TV plug/tuner connection (Japan) | |
| 139 | 15A Refrigerated box in the back of the rear seat |
| 140 | 15A Cigarette lighter plug with ashtray light, rear |
| Socket 115 V | |
| 141 | 5A Rear view camera control unit |
| Rear view camera power module | |
| 142 | 7.5A PTS control unit (PARKTRONIC) |
| Radar sensor control unit (SGR) | |
| Control unit for video sensors and radar sensors (from 1.9.10) | |
| 143 | 25A Rear seat control unit |
| 144 | 25A Rear seat control unit |
| 145 | 20A AHV drawbar connector, 13-pin |
| 146 | 25A Trailer recognition control unit |
| 147 | Reserve |
| 148 | 25A End sleeve terminal 30 panoramic sliding sunroof |
| 149 | 25A Panoramic sliding sunroof control module |
| 150 | 7.5A Combo TV tuner (analogue/digital) |
| TV plug/tuner connection (Japan) | |
| 151 | 20A Trailer detection control unit 25A Electric parking brake control module |
| 152 | 25A DC/AC converter control unit 7.5A Antenna amplifier module above the rear window |
| Relay | |
| M | Terminal 15 relay (2) / reserve 1 (changeover relay) |
| Н | Relay terminal 15R |
| O | Socket relay |
| P | Heated rear window relay |
| Q | Engine 156, 157, 275, 278, 629: Circulation pump relay |
| S 400 Hybrid: Circulation pump relay 2 power electronics | |
| R | cigarette lighter relay |
| S | Engine 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
Diagram
Appointment
| 2 | 400A Generator (G2) |
| 3 | 150A Electro-hydraulic power steering |
| Engine 629, 642: End of glow plug time | |
| 4 | F32/4 passenger compartment power fuse box |
| 5 | 100A Suction motor and air conditioning fan with integrated regulator |
| 6 | 150A Front SAM control box with fuse and relay module |
| 7 | 40A ESP control unit |
| S 400 Hybrid: Brake energy regeneration control unit | |
| 8 | 25A ESP control unit |
| S 400 Hybrid: Brake energy regeneration control unit | |
| 9 | 25A Front SAM control box with fuse and relay module |
| 10 | Reserve |
| Relay | |
| F32/4k2 | Relay 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.
this is an exceptional piece you have on the web. really helpful. i really appreciate.
Great work! It is very helpful. Thanks!
Much, much appreciated for this information provided!
Very informative, but where is the ABS management chip on the early Mercedes S280 of 1994? I know it have ABS system somewhere but not sure where. Also does the same car have traction control or is it too early for traction control?
Keep the good work guy’s this is great