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).

Front prefuse box (X4/10) opened.

Rear prefuse box (X4/22) opened.