W220 Fuse Box Diagram: Find the Right Panel and Circuit

Match the fuse chart to the car before pulling a fuse. The W220 has two main fuse boxes in the engine compartment and one beneath the right rear seat. Facelift cars also have a fuse box at the passenger-side end of the dashboard; pre-facelift cars do not. Several circuit assignments changed, so a single “1999–2005” diagram is not a reliable universal reference. W220 fuse reference

Choose the correct fuse chart

First look in the vehicle tool kit in the trunk’s spare-wheel well. Mercedes supplied a chart showing fuse allocations and amperages, together with spare fuses and an extractor. Use that chart if it matches the vehicle. 2005 Mercedes S-Class operator’s manual, pp. 379–380 and 411

If it is missing, these archived charts provide the circuit lookup. The build-date periods below are those listed in the W220 chart catalogue, not registration-year ranges.

Listed build-date applicability	Chart part number and reference
Up to 30 June 2001	A0005451500 — compact circuit-assignment chart; replaces A0005451400
From 30 June 2001 to 30 September 2002	A0005451600 — panel layouts, relays and circuit assignments
From 30 September 2002 to 30 September 2003	A0005451700 — compact fuse and relay lookup
From 28 October 2003	A0005451800 — panel layouts, relays and circuit assignments

For a car at a changeover date—or in the catalogue’s September–October 2003 gap—ask a Mercedes parts or service department to confirm the chart by VIN rather than guessing. Also match the engine, market and fitted equipment; the later chart lists alternative engine-management and fuel-pump assignments.

Fuse-box locations and layout references

Left and right mean the vehicle’s sides when seated facing forward, not when standing in front of the bonnet. Do not substitute “driver side” for “left” on a right-hand-drive car.

Panel	Where to find it	Fuse numbers	Relay letters / layout reference
Left engine-compartment box, F1	Near the firewall, vehicle left	f1–f27	A–J; left-panel layout
Right engine-compartment box, F1/1	Near the firewall, vehicle right	f28–f49	K–P; right-panel layout
Rear fuse/relay module, K40/5	Beneath the right rear seat, behind its access cover	f50–f77	Q–U; rear-panel layout
Cockpit box, F3 — facelift	Passenger-side end of dashboard: right on LHD, left on RHD	f78–f86	dashboard layout

The later reference also shows an additional f87–f91 / V–X engine-compartment group labelled “only 12 cylinder/AMG.” Do not expect it on every W220 or apply its assignments without checking the engine-specific diagram. Mercedes chart A0005451800

Use the numbered layout, not a count of occupied slots. A fuse number such as f32 identifies a position; a letter such as O identifies a relay.

Common facelift fuse assignments

This quick lookup uses the later A0005451700 and A0005451800 circuit assignments, with ratings from the W220 Encyclopedia’s facelift fuse tables. It is not an early-car replacement chart. Confirm the specified rating on your car’s chart before replacement.

Circuit	Fuse number and rating	Panel
Windscreen wipers	f5 — 40A; f78 — 7.5A	Left engine / dashboard
Windscreen washer	f10 — 15A	Left engine
Brake-light switch	f16 — 7.5A	Left engine
COMAND/navigation	f22 — 7.5A; 15A listed for Japan	Left engine
CD changer / TV	f23 — 7.5A	Left engine
Audio gateway / car audio	f24 — 20A	Left engine
Sound system	f25 — 25A	Left engine
Horns	f28 — 15A	Right engine
AIRMATIC compressor	f32 — 40A	Right engine
Front climate-control blower	f33 — 40A	Right engine
Transmission control	f37 — 15A	Right engine
ABC/AIRMATIC control supplies	f9 — 20A; f46 — 5A	Left / right engine
Fuel pump, standard later-chart assignment	f52 — 30A	Rear
Rear-window defroster	f53 — 50A; f82 — 10A	Rear / dashboard
Central locking	f62 — 20A	Rear
Parktronic	f75 — 10A; f80 — 10A	Rear / dashboard
Sunroof / overhead lighting	f77 — 40A	Rear
Instrument cluster	f79 — 5A; f84 — 5A; f85 — 5A	Dashboard
Diagnostic socket	f81 — 10A; f84 — 5A	Dashboard
Front cigarette lighter	f86 — 15A	Dashboard

Useful relay letters are L: starter, O: air suspension, P: horns, T: fuel pump and U: rear-window heater. The 1800 chart also lists f91 and relay X for the AMG fuel-pump circuit; check applicability before using the standard f52/T assignment. Mercedes chart A0005451800

Early-car assignments that differ

These examples show why the dashboard-box change matters. They compare the early A0005451500 lookup with the later charts; use the matching build-period chart for the complete list and amperages.

Circuit	Early 1500 chart	Later 1700/1800 charts
Front cigarette lighter	f11	f86
Diagnostic socket	f20, f24	f81, f84
Instrument cluster	f20, f21, f22	f79, f84, f85
Navigation	f61	f22
Radio/COMAND/sound	f61, f66	Separate f22, f24 and f25 assignments

Access and replacement stop points

Switch off the ignition and remove the key before removing a fuse. W220 fuse-service guidance

On facelift cars, open the front passenger door to reach the dashboard cover. Mercedes specifies a flat, blunt lever, not a sharp screwdriver. The engine-compartment covers use sliding locks; refit and lock them correctly to keep moisture and dirt out. Operator’s manual, pp. 412–413

Replace a blown fuse only with the specified type and amperage. Never bridge it or fit a higher-rated fuse. If the replacement blows, stop and investigate the circuit rather than feeding it more fuses. Mercedes explicitly warns against repairing or bridging a fuse because of electrical-damage and fire risks. Operator’s manual, p. 411

Not every failed lamp has a removable blade fuse: the Mercedes chart labels many lighting outputs “electronic fuse.” Separate high-current prefuse blocks also exist beneath the passenger footwell carpet and behind the right trunk lining; they are outside the normal f1–f86 lookup. Do not treat those battery-distribution connections as ordinary fuse-pulling work. Electronic protection and prefuse locations

If your task is isolating battery drain rather than replacing a blown fuse, use the separate W220 parasitic-draw testing procedure.