Fuses and relays Mercedes-Benz S-class (W220, 1998 - 2005)

The fourth generation of the Mercedes-Benz S-Class was presented at the Paris Motor Show in 1998. The creator of the model was Steve Mattin. In 2002, the car went through a restyling. In this article we will understand in detail fuse box diagrams Mercedes W220 (4th Gen; S-Class: S280, S320, S350, S430, S500, S600, S55 AMG, S63 AMG, S65 AMG, S320 CDI, S400 CDI) 1998, 1999, 2000, 2001, 2002, 2003, 2003, 2004, 2005 years of manufacture.

Here you will find the locations and photos of the mounting blocks. Also, we will separately mark the fuses responsible for the cigarette lighter and the fuel pump.

In the engine compartment

The main mounting block is located on the driver's side.

General view of the main unit.

Diagram
Models after 2002
Models up to 2002
No.	Relay description
R1	Windshield wiper de-icing relay
R2	Terminal 15 relay
R3	Terminal 15R relay
R4	steering column adjustment 1/2, horizontal
R5
R6	high pressure headlamp washer
R7	Wiper high / low relay
R8	wiper
R9	steering column adjustment 1/2, vertical
R10
No.	Fuse decoding	A
1	Windshield wiper de-icing relay	40
2	High pressure headlamp washer relay	50
3	Steering column adjustment, horizontal	15
4	Steering column adjustment, vertical	15
5	Wiper relay	40
6	Heater switch (up to 2002)	7.5
	Not used (after 2002)	-
7	Empty	-
8	Empty	-
9	Air suspension	30
	ADS control unit
	Body control unit
10	Windshield washer pump	15
11	mercedes w220 front cigarette lighter fuse  (before 2002)	15
	Ashtray illumination (up to 2002)
	Not used (after 2002)	-
12	Automatic location recognition (up to 2002)	7.5
	Seat belt buckle warning light (up to 2002)	7.5
	Not used (after 2002)	-
13	Front left door control unit	40
14	Empty	-
15	Empty	-
16	Stop lamp switch	7.5
17		-
18	Telephone	5
	Emergency call system
19	Seat belt pretensioner (after 2002)	-
		5
20	Diagnostic connector (up to 2002)	5
	Instrument panel (before 2002) Not used (after 2002)	-
21	Instrument panel (before 2002) Not used (after 2002)	5
		-
22	Instrument panel (up to 2002)	5
	Audio system (after 2002)	15
	Radio remote display (after 2002)
23	Climate control (up to 2002)	10
	Air conditioning control unit (up to 2002)
	TV tuner (after 2002)
	CD changer (after 2002)
24	Diagnostic connector (up to 2002)	10
	Audio system (after 2002)	20
	Center console (after 2002)
25	Not used (before 2002) Audio amplifier (after 2002)	-
		25
26	Top control panel module (before 2002) Not used (after 2002)	10
27	Empty	-

Additional fuse box

The auxiliary unit is located on the passenger side.

General view.

Diagram
No.	Relay
R1	Relay motor electronics
R2	Starter
R3	Engine control unit, diesel
	Or
	Air pump
R4	Air compressor relay
R5	horn relay
No.	Circuit breakers	A
1	horn (beep)	15
2	Relay motor electronics	20
3		20
4	Secondary air pump relay	40
5	Air compressor relay	40
6	Heating system	40
7	Traction control unit - until 2002	5
	Traction control unit - after 2002	10
8	Heated steering wheel (after 2002)	15
	Empty(until 2002)	-
9	Daylight system	7.5
10	Transmission control unit / Automatic transmission shift lever	15
11	Opening the luggage compartment	5
12	Door control unit, front right	40
13	Xenon lamps	10
	Headlight adjustment
14	Additional heater	20
15	Relay, additional air unit	20
16	Engine Control Unit, Diesel / Starter Relay	25
17	Engine control unit, diesel / intake manifold heater	7.5
18	Empty	-
19	Body Control Unit / ADS Control Unit / Air Suspension	5
20	Relay, auxiliary air unit / A / C control unit / Fan control	10
21	Cooling fan control unit or not used (before 2002)	7.5
	Empty (after 2002)	-
22	Ignition coils and capacitor	15

Additional block #2 (only cars after 2002)

Vehicles after 2002 model year are equipped with another mounting block.

Diagram
No.	Decryption	A
R1	Motronic system
R2	Charge air relay
R3	Relay of the fuel module in the tank (fuel pump relay) or Empty
1	Motronic system	20
2	Motronic system	20
3	Not
4	Charge air relay	10
5	Not

In the passenger compartment

Here there are two units responsible for the protection of the vehicle's electrical circuits.  

First unit

Fuse box #1 is located under the rear passenger seat.

Diagram
No.	Description
R1	Rear window curtain relay
R2	Traction sensor relay
R3	Terminal 15 relay
R4	Additional fuel pump relay
R5	Rear window heater relay
No.	Description	A
1	Rear window curtain relay	10
2	Traction sensor	5
3	Additional fuel module relay (Mercedes w220 fuel pump fuse)	30
4	Rear window heater relay	50
5	Trailer control unit	10
6	Trailer connector	25
7	Trailer control unit	30
8	Closing the luggage compartment	25
	Luggage compartment release relay
9	Keyless go control unit	7.5
10	Control unit (for cab)	30
11	Empty	-
12	Voice control unit	15
	Handsfree phone
13	Pneumatic System Equipment (PSE)	20
14	Telephone	7.5
15	Multifunctional control unit	7.5
	Antenna amplifier
16		-
17	Sound amplifier	25
18	rear power seats	25
19	Rear air conditioner	15
	Coolant circulation pump
20	Rear air conditioner	15
21	Tire pressure monitoring system control unit	10
22	Front left seat belt pretensioner	25
23	Door control unit, rear left	40
24	Front right seat belt pretensioner	25
25	Door control unit, rear right	40
26	Parktronic system	10
27	Refrigerator (in the rear seat backrest)	15
28	Top console (in the ceiling)	40

Second unit

Located in the end of the dashboard on the passenger side, behind the cover protection.

Diagram
No.	Decryption	A
1	Steering column control unit	7.5
	engine control unit
	EIS control unit
	Alarm
2	Instrument Panel	5
3	Top Control Panel Module	10
4	Diagnostic connector (DLC)	10
5	Climate control	10
	Air conditioner control unit
6	Center console	10
7	Diagnostic connector (DLC)	5
	Instrument Panel
8	Instrument Panel	5
9	Front cigarette lighter fuse	15
	Ashtray illumination