Fuses
This page describes fuse boxes, fuses and relays as of W220 facelift vehicles (from 30/09/2002). The major difference in pre-facelift vehicles is that instead of four fuse boxes (two in the engine compartment, one under the back seat, and one in the side of the dashboard), pre-facelift vehicles have three, omitting the fuse box in the side of the dashboard.
Fuse charts for all vehicles in compact printable form are available for download in the section below. It is recommended that you keep a printed version of the charts in a plastic sleeve with the spare fuses in the spare wheel well.
Left fuse box (F1)
Located in engine compartment left.
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| No. | Rating | Function | Comment |
|---|---|---|---|
| f1 | 40A | Wiper recess heating | |
| f2 | 50A | ESP | |
| f3 | 15A | Adjustable steering column | |
| f4 | 15A | Adjustable steering column | |
| f5 | 40A | Windscreen wipers | |
| f6 | |||
| f7 | |||
| f8 | |||
| f9 | 20A | ABC suspension; Air suspension | Permanently powers Airmatic control module. |
| f10 | 15A | Windshield washer system | |
| f11 | 5A | Electronic toll collection | |
| f12 | |||
| f13 | 40A | Adjustable mirror, left; Automatic dimming exterior mirror; Driver seat adjustment; Driver seat heating; Entrance lights; Exterior mirror indicators, left/right; Folding exterior mirror; Heated mirror; Interior mirror adjuster; Power locking; Power window, driver seat; Power window, passenger seat; Power window, rear left; Power window, rear right; Remote closing and locking trunk lid; Remote trunk lid release |
Permanently powers door control module in the front left door. |
| f14 | |||
| f15 | |||
| f16 | 7.5A | Stop signal switch | |
| f17 | 7.5A | Seat belt locking system | |
| f18 | 5A | Telephone systems/emergency call | |
| f19 | 5A | Seat belt pre-tensioner | |
| f20 | |||
| f21 | |||
| f22 | 7.5A (15A Japan) | Navigation system | Permanently powers COMAND-APS. |
| f23 | 7.5A | CD changer; TV/Rear TV |
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| f24 | 20A | Car audio system | Permanently powers MOST Audio Gateway. |
| f25 | 25A | Sound system | |
| f26 | |||
| f27 |
| No. | Description | Comment |
|---|---|---|
| A | Wiper heating, end position | |
| B | Binding post 15 | |
| C | Binding post 15R | |
| D | Steering column jacket horizontal 1 | |
| E | Steering column jacket horizontal 2 | |
| F | Recirculating pump | |
| G | Wiper speed 1 / 2 | |
| H | Wiper ON / OFF | |
| I | Steering column jacket vertical 1 | |
| J | Steering column jacket vertical 2 |
Right fuse box (F1/1)
Located in engine compartment right.
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| No. | Rating | Function | Comment |
|---|---|---|---|
| f28 | 15A | Fanfare horns | |
| f29 | 20A | Gasoline Engine: Engine Emergency stop; Gasoline Engine: Engine management unit |
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| f30 | 20A | Gasoline Engine: Engine fan; Gasoline Engine: Engine Emergency stop; Gasoline Engine: Engine management unit |
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| f31 | 40A | ||
| f32 | 40A | Air suspension; Air suspension compressor |
Powers Airmatic compressor through 'O' relay. |
| f33 | 40A | Automatic temperature control; Blower motor AC |
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| f34 | 10A | ESP | |
| f35 | 15A | Steering wheel heating | |
| f36 | 7.5A | Distronic | |
| f37 | 15A | Transmission control | |
| f38 | 5A | Trunk interior non-locking switch | |
| f39 | 40A | Adjustable mirror, right; Automatic dimming exterior mirror; Entrance lights; Exterior mirror indicators, left/right; Folding exterior mirror; Front passenger seat heating; Heated mirror; Passenger seat adjustment; Power locking; Power window, passenger seat |
Powers door control module in the front right door. |
| f40 | 10A | Head light range adjustment | |
| f41 | 20A | Auxiliary heating; Heater booster |
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| f42 | 20A | ||
| f43 | 25A | Diesel engine: Engine Emergency Stop; Diesel engine: Engine management unit |
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| f44 | 10A | Diesel engine: Engine fan; Diesel engine: Engine Emergency stop; Diesel engine: Engine management unit |
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| f45 | |||
| f46 | 5A | ABC suspension; Air suspension | Terminal 87 to Airmatic control unit. |
| f47 | 10A | Automatic temperature control | |
| f48 | |||
| f49 | 15A | Ignition coils |
| No. | Description | Comment |
|---|---|---|
| K | Motronic / Chassis | |
| L | Starter | Activates starter. |
| M | Diesel control system | |
| N | Secondary air pump | |
| O | Air suspension | Activates Airmatic compressor. |
| P | Horn |
| No. | Rating | Function | Comment |
|---|---|---|---|
| f87 | 20A | AMG (12 cylinder) Engine fan; AMG (12 cylinder) Engine Emergency Stop; AMG (12 cylinder) Engine management unit |
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| f88 | 20A | AMG (12 cylinder) Engine Emergency stop; AMG (12 cylinder) Engine management unit |
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| f89 | |||
| f90 | 10A | ||
| f91 | 10A | AMG (12 cylinder) Fuel pump |
| No. | Description | Comment |
|---|---|---|
| V | Motronic | |
| W | Coolant pump charge air | |
| X | Fuel pump AMG |
Rear fuse and relay module (K40/5)
Located in cabin under right rear seat.
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| No. | Rating | Function | Comment |
|---|---|---|---|
| f50 | 10A | Rear window blind | |
| f51 | 5A | Anti-theft alarm system | |
| f52 | 30A | Fuel pump | |
| f53 | 50A | Rear window defroster | |
| f54 | 10A | Trailer coupling | |
| f55 | 25A | Trailer coupling; Trailer power supply |
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| f56 | 30A | Trailer coupling | |
| f57 | 25A | Remote closing and locking trunk lid | |
| f58 | 7.5A | Keyless Go | |
| f59 | 30A | Taxi | |
| f60 | 7.5A | Antenna booster; Electronic toll collection |
Permanently powers navigation unit in trunk. |
| f61 | 7.5A | Telephone systems/emergency call; Voice control system/Linguatronics |
Permanently powers TV tuner in trunk. |
| f62 | 20A | Central locking; Power locking; Rear head release; Rear head restraint adjustment; Remote closing and locking trunk lid; Remote trunk lid release; Trunk interior non-locking switch |
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| f63 | 30A | Interactive seat | |
| f64 | 25A | Driver seat adjustment; Driver seat heating; Driver seat ventilation; Seat belt comfort fit system |
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| f65 | |||
| f66 | 25A | Front passenger seat heating; Front passenger seat ventilation; Passenger seat adjustment; Seat belt comfort fit system |
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| f67 | 25A | Rear seat adjustment; Rear seat heating; Rear seat ventilation |
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| f68 | 15A | Rear air conditioning | |
| f69 | 15A | Rear air conditioning | |
| f70 | 10A | Tyre (tire) pressure monitoring system | |
| f71 | 40A | Seat belt pre-tensioner | |
| f72 | 40A | Cigarette lighter rear left; Entrance lights; Power locking; Power window rear left; Rear head restraint adjustment; Rear seat adjustment; Rear seat heating |
Permanently powers door control module in the rear left door. |
| f73 | 40A | Seat belt pre-tensioner | |
| f74 | 40A | Cigarette lighter rear right; Entrance lights; Power locking; Power window rear right; Rear head restraint adjustment; Rear seat adjustment; Rear seat heating |
Permanently powers door control module in the rear right door. |
| f75 | 10A | Parktronic system | |
| f76 | 15A | Cool box | |
| f77 | 40A | Automatic dimming interior mirror; Dome lamp; Garage door opener; Interior mirror adjuster; Interior motion sensor; Makeup mirror; Rain/Driving light sensor; Reading lamps; Sliding/tilting sunroof |
| No. | Description | Comment |
|---|---|---|
| Q | Rear blind | |
| R | Tow-away protection EDW | |
| S | Binding post 15 | |
| T | Fuel pump | |
| U | Rear window heater |
Cockpit fuse box (F3)
The fuse box is located in cabin dashboard on the passenger side (right on LHD vehicles and left on RHD vehicles).
These images show fuse box location in left-hand drive vehicles.
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The next image shows fuse box designations in right-hand drive vehicles.
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| No. | Rating | Function | Comment |
|---|---|---|---|
| f78 | 7.5A | Adjustable steering column; Anti-theft alarm system; Cruise control; Engine management unit; Ignition lock; Steering wheel heating; Steering column module; Windscreen wipers |
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| f79 | 5A | Instrument cluster | |
| f80 | 10A | Adjustable mirror, left; Adjustable mirror, right; Anti-theft alarm system; Auxiliary heating; Distronic; ESP; Hazard warning system; Heater booster; Parktronic system; Rear head release; Rear head restraint adjustment; Rear window blind |
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| f81 | 10A | Diagnostic socket | |
| f82 | 10A | Automatic temperature control; Rear window defroster |
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| f83 | 10A | Central control unit | |
| f84 | 5A | Diagnostic socket; Instrument cluster |
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| f85 | 5A | Instrument cluster | |
| f86 | 15A | Cigarette lighter front |
Fuse Charts
Original fuse charts and fuse booklets in compact printable form are available below.
The fuse chart along with fuse removing tool and spare fuses are stored in tool box of the spare wheel well.
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W220 Update model searchable, both alphabetically and numerically, fuse charts in compact printable form are available here.
File:W220 Fuse Ratings Locations and Consuming Units Version 02.pdf
Electronic Fuses
The following electronic consumers are electronically fused by SAM (Signal Acquisition / Actuation Module): Dipped beam headlamp, left/right; Fog lamp, front left/right; Front side light left/right; Hazard warning system; Main beam headlamp left/right; Rear fog lamp; Rear side lamp left/right; Registration plate lighting; Reversing lamp; Trunk light; Turn indicators.
Prefuses
In addition, there are several large fuses, 100 amp or so, sometimes called "pre-fuses" that supply power directly from the battery via large red wires to the SAMs and the fuse boxes attached to them. The "pre-fuses" are not shown on the fuse diagrams. If these are shorted, the fuse and the block that contains it must be replaced. The 100 amp fuses are not available separately.
There are two prefuse boxes in W220. X4/10 (underneath the passenger footwell carpets) and X4/22 (trunk right).
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