Table of Contents
The fourth generation of the Mercedes-Benz S-Class debuted at the Paris Motor Show in 1998, styled by designer Steve Mattin. The model underwent a facelift in 2002. In this article, we provide a detailed overview of the fuse box diagrams and relay assignments for the Mercedes-Benz S-Class (W220; S280, S320, S350, S430, S500, S600, S55 AMG, S63 AMG, S65 AMG, S320 CDI, S400 CDI) produced for model years 1998 through 2005.
Below are the locations, photo guides, and circuit diagrams for the distribution boxes. Fuses for the “Cigarette Lighter” and “Fuel Pump” are highlighted in bold.
In the Engine Compartment
The main distribution box is located on the driver’s side of the engine compartment.
Main fuse box layout.
| Diagram | ||
|---|---|---|
Models from 2002 onward (Facelift)
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Models up to 2002 (Pre-facelift)
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| No. | Relay Designation | |
| R1 | Windshield wiper heated park zone relay | |
| R2 | Terminal 15 relay | |
| R3 | Terminal 15R relay | |
| R4 | Steering column reach adjustment relay 1/2 | |
| R5 | ||
| R6 | Headlamp washer pump relay | |
| R7 | Wiper speed select relay (High/Low) | |
| R8 | Wiper ON/OFF relay | |
| R9 | Steering column tilt adjustment relay 1/2 | |
| R10 | ||
| No. | Protected Circuit / Component | Rating (A) |
| 1 | Windshield wiper heated park zone relay | 40 |
| 2 | Headlamp washer pump relay | 50 |
| 3 | Steering column reach adjustment | 15 |
| 4 | Steering column tilt adjustment | 15 |
| 5 | Wiper relay | 40 |
| 6 | Heater switch (1998–2002) | 7.5 |
| Not used (2002–2005) | - | |
| 7 | Vacant | - |
| 8 | Vacant | - |
| 9 | AIRMATIC air suspension | 30 |
| Adaptive Damping System (ADS) control module | ||
| Body Control Module (BCM) | ||
| 10 | Windshield washer pump | 15 |
| 11 | Mercedes-Benz W220 front cigarette lighter fuse (1998–2002) | 15 |
| Ashtray illumination (1998–2002) | ||
| Not used (2002–2005) | - | |
| 12 | Automatic child seat recognition (AKSE) (1998–2002) | 7.5 |
| Seat belt warning light (1998–2002) | 7.5 | |
| Not used (2002–2005) | - | |
| 13 | Front left door control module | 40 |
| 14 | Vacant | - |
| 15 | Vacant | - |
| 16 | Brake light switch | 7.5 |
| 17 | Vacant | - |
| 18 | Cellular telephone | 5 |
| Emergency call system (TELE AID) | ||
| 19 | Seat belt tensioner (2002–2005) | - |
| 5 | ||
| 20 | Data Link Connector (OBD-II / DLC) (1998–2002) | 5 |
| Instrument cluster (1998–2002) Not used (2002–2005) |
- | |
| 21 | Instrument cluster (1998–2002) Not used (2002–2005) |
5 |
| - | ||
| 22 | Instrument cluster (1998–2002) | 5 |
| Audio system / COMAND (2002–2005) | 15 | |
| Radio remote display (2002–2005) | ||
| 23 | Automatic Climate Control (AAC) (1998–2002) | 10 |
| A/C control module (1998–2002) | ||
| TV tuner (2002–2005) | ||
| CD changer (2002–2005) | ||
| 24 | Data Link Connector (OBD-II / DLC) (1998–2002) | 10 |
| Audio system / COMAND (2002–2005) | 20 | |
| Center console switch group (2002–2005) | ||
| 25 | Not used (1998–2002) Audio amplifier (2002–2005) |
- |
| 25 | ||
| 26 | Overhead Control Panel (OCP) (1998–2002) Not used (2002–2005) |
10 |
| 27 | Vacant | - |
Auxiliary Engine Compartment Fuse Box
The auxiliary distribution box is located on the front passenger side of the engine compartment.
Auxiliary fuse box assembly.
| Diagram | ||
|---|---|---|
|
||
| No. | Relay Designation | |
| R1 | Engine electronics relay (ME-SFI) | |
| R2 | Starter relay | |
| R3 | Diesel Engine Control Module (CDI) | |
| OR | ||
| Secondary air injection pump relay | ||
| R4 | AIRMATIC compressor relay | |
| R5 | Horn relay | |
| No. | Protected Circuit / Component | Rating (A) |
| 1 | Dual horns | 15 |
| 2 | Engine electronics control module (ME-SFI) | 20 |
| 3 | 20 | |
| 4 | Secondary air injection pump relay | 40 |
| 5 | AIRMATIC compressor relay | 40 |
| 6 | Heater blower motor / Heating system | 40 |
| 7 | Traction control system (ESP/ABS) (1998–2002) | 5 |
| Traction control system (ESP/ABS) (2002–2005) | 10 | |
| 8 | Heated steering wheel (2002–2005) | 15 |
| Vacant (1998–2002) | - | |
| 9 | Daytime running lights (DRL) | 7.5 |
| 10 | Transmission Control Module (TCM) / Electronic Selector Lever Module (ESM) | 15 |
| 11 | Remote trunk release switch | 5 |
| 12 | Front right door control module | 40 |
| 13 | Xenon headlamps | 10 |
| Headlamp range adjustment | ||
| 14 | Auxiliary heater | 20 |
| 15 | Secondary air injection pump relay | 20 |
| 16 | Diesel Engine Control Module (CDI) / Starter relay | 25 |
| 17 | Diesel Engine Control Module (CDI) / Intake manifold preheater | 7.5 |
| 18 | Vacant | - |
| 19 | Body Control Module (BCM) / Adaptive Damping System (ADS) / AIRMATIC air suspension | 5 |
| 20 | Secondary air injection relay / A/C control module / Engine cooling fan control | 10 |
| 21 | Engine cooling fan control module or vacant (1998–2002) | 7.5 |
| Vacant (2002–2005) | - | |
| 22 | Ignition coils and suppression capacitor | 15 |
Auxiliary Fuse Box #2 (2002–2005 Facelift Models)
Facelifted models (from the 2002 model year onward) are equipped with an additional auxiliary distribution box.
| Diagram | ||
|---|---|---|
|
||
| No. | Protected Circuit / Component | Rating (A) |
| R1 | Engine management system (ME-SFI) | |
| R2 | Intercooler charge air pump relay | |
| R3 | In-tank fuel module relay (Fuel pump relay) or Vacant |
|
| 1 | Engine management system (ME-SFI) | 20 |
| 2 | Engine management system (ME-SFI) | 20 |
| 3 | Not used | |
| 4 | Intercooler charge air pump relay | 10 |
| 5 | Not used | |
In the Passenger Compartment
The passenger cabin houses two distribution boxes for interior electrical circuits.
Rear Passenger Compartment Fuse Box
The rear passenger compartment fuse box is located under the right rear seat.
| Diagram | ||
|---|---|---|
|
||
| No. | Relay Designation | |
| R1 | Rear window roller blind relay | |
| R2 | Tow-away protection sensor relay | |
| R3 | Terminal 15 relay | |
| R4 | Auxiliary fuel pump relay | |
| R5 | Heated rear window relay | |
| No. | Protected Circuit / Component | Rating (A) |
| 1 | Rear window roller blind relay | 10 |
| 2 | Tow-away protection / Inclination sensor | 5 |
| 3 | Auxiliary fuel module relay (Mercedes-Benz W220 fuel pump fuse) | 30 |
| 4 | Heated rear window relay | 50 |
| 5 | Trailer recognition control module | 10 |
| 6 | Trailer hitch socket | 25 |
| 7 | Trailer recognition control module | 30 |
| 8 | Trunk lid power closing | 25 |
| Remote trunk lid release relay | ||
| 9 | KEYLESS-GO control module | 7.5 |
| 10 | Special vehicle / Taxi control module | 30 |
| 11 | Vacant | - |
| 12 | Voice Control System (VCS / Linguatronic) | 15 |
| Hands-free telephone | ||
| 13 | Pneumatic System Equipment (PSE) pump | 20 |
| 14 | Cellular telephone | 7.5 |
| 15 | Multifunction control module | 7.5 |
| Antenna amplifier | ||
| 16 | - | |
| 17 | Audio power amplifier | 25 |
| 18 | Power rear seats | 25 |
| 19 | Rear automatic climate control | 15 |
| Auxiliary coolant circulation pump | ||
| 20 | Rear automatic climate control | 15 |
| 21 | Tire Pressure Monitor (TPMS) control module | 10 |
| 22 | Front left seat belt tensioner | 25 |
| 23 | Rear left door control module | 40 |
| 24 | Front right seat belt tensioner | 25 |
| 25 | Rear right door control module | 40 |
| 26 | PARKTRONIC system (PTS) control module | 10 |
| 27 | Refrigerator box (rear seat backrest) | 15 |
| 28 | Overhead Control Panel (OCP) | 40 |
Dashboard Fuse Box
Located on the right side (end face) of the instrument panel on the passenger side, behind the protective cover.
| Diagram | ||
|---|---|---|
|
||
| No. | Protected Circuit / Component | Rating (A) |
| 1 | Steering column module (SCM) | 7.5 |
| Engine Control Module (ECM) | ||
| Electronic Ignition Switch (EIS) | ||
| Anti-theft alarm system (ATA) | ||
| 2 | Instrument cluster | 5 |
| 3 | Overhead Control Panel (OCP) | 10 |
| 4 | Data Link Connector (OBD-II / DLC) | 10 |
| 5 | Automatic Climate Control (AAC) | 10 |
| A/C control module | ||
| 6 | Center console switch group | 10 |
| 7 | Data Link Connector (OBD-II / DLC) | 5 |
| Instrument cluster | ||
| 8 | Instrument cluster | 5 |
| 9 | Front cigarette lighter fuse | 15 |
| Ashtray illumination | ||