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.
In Engine Compartment Left - Fuses 1 to 27 and Relay Box
| 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 | |
| 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 |
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 | |
| f23 | 7.5A | CD changer; TV/Rear TV |
|
| f24 | 20A | Car audio system | |
| 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 |
Fuses 1 to 27 and Relay Box in Engine Compartment Left
Relays A to J in Engine Compartment, Left
In Engine Compartment Right - Fuses 28 to 49 and Relay Box
| No. | Rating | Function | Comment |
|---|---|---|---|
| f28 | 15A | Fanfare horns | |
| f29 | 20A | Gasoline Engine: Engine Emergency stop; Gasoline Engine: Engine management unit |
|
| f30 | 20A | Gasoline Engine: Engine fan; Gasoline Engine: Engine Emergency stop; Gasoline Engine: Engine management unit |
|
| f31 | 40A | ||
| f32 | 40A | Air suspension; Air suspension compressor |
|
| f33 | 40A | Automatic temperature control; Blower motor AC |
|
| 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 |
|
| f42 | 20A | ||
| f43 | 25A | Diesel engine: Engine Emergency Stop; Diesel engine: Engine management unit |
|
| f44 | 10A | Diesel engine: Engine fan; Diesel engine: Engine Emergency stop; Diesel engine: Engine management unit |
|
| f45 | |||
| f46 | 5A | ABC suspension; Air suspension | |
| f47 | 10A | Automatic temperature control | |
| f48 | |||
| f49 | 15A | Ignition coils |
Fuses 28 to 49 and Relay Box in Engine Compartment Right
Relays K to P in Engine Compartment, Right
In Engine Compartment Fuse and Relay Boxes There are fuse boxes located in the engine compartment on both the driver's and front passenger side in front of the firewall (dividing wall between engine compartment and passenger compartment).
In Cabin; Under Right Rear Seat - Fuses 50 to 77 and Relays
Fuses 50 to 77 and Relay Box Under Right Rear Seat
Relays Q to U in Cabin, Under Right Rear Seat
In Cabin; Under Right Rear Seat
In Cabin; Dashboard Fuse Box - Fuses 78 to 86
Fuses 78 to 86 Dashboard
In Cabin; Dashboard Fuse Box (LHD on R or passenger side and RHD on L or passenger side)
Note: Images show fuse box location in left-hand drive vehicles.
In Engine Compartment Front, Right - Fuses 87 to 91 and Relay Box
Fuses 87 to 91 and Relays in Engine Compartment Front, Right, 12 Cylinder AMG Only
Relays V to X in Engine Compartment, Front, 12 Cylinder AMG Only
Fuse Charts
| Part No. | Applicable |
|---|---|
| A0005451400 | To Date: 30/06/2001, Replaced by: A0005451500 |
| A0005451500 (compact chart) | To Date: 30/06/2001 |
| A0005451600 (compact chart) | From Date: 30/06/2001 To Date: 30/09/2002 |
| A0005451700 (compact chart) | From Date: 30/09/2002 To Date: 30/09/2003 |
| A0005451800 (compact chart) | From Date: 28/10/2003 |
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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