Table of Contents
The Mercedes-Benz W638 is the first generation of Vito commercial vans and minibuses produced by German automaker Daimler AG. It replaced the MB100 series vehicles. Serial production began in 1995. This article provides detailed fuse box diagrams and relay panel layouts for the Mercedes-Benz Vito W638 (1st Gen / W638 chassis code) produced for model years 1996, 1997, 1998, 1999, 2000, 2001, 2002, and 2003.
Below you will find panel locations, photos, and circuit diagrams. Fuses for the “Cigarette Lighter” and “Fuel Pump” are highlighted in bold.
In the passenger compartment
Two fuse panels located inside the cabin protect the vehicle’s electrical circuits.
Unit #1
Fuse box beneath the steering column: 1. Cover closed 2. Cover removed.
Example illustration shown.
| Diagram | ||
|---|---|---|
|
||
| No. | A | Circuit Protected |
| 1 | 15 | Right parking lamp, right tail lamp |
| 2 | 15 | Right high-beam headlight |
| 3 | 15 | Left high-beam headlight, high-beam indicator light |
| 4 | 15 | Reversing lamps, warning buzzer, central locking system |
| 5 | 15 | Stop lamps |
| 6 | 20 | Front and rear windshield wipers, hazard warning lamps |
| 7 | 15 | Terminal 15 power circuit |
| 8 | 20 | Interior lighting, cigarette lighter fuse, radio (Terminal 30 power circuit) |
| 9 | 15 | Turn signal indicators, instrument cluster, tachograph |
| 10 | 15 | Instrument cluster illumination, license plate lamps, daytime running lights |
| 11 | 15 | Left parking lamp, left tail lamp |
| 12 | 15 | Right low-beam headlight, rear fog lamp |
| 13 | 15 | Left low-beam headlight |
| 14 | 15 | Front fog lamps |
| 15 | 15 | Radio (Terminal 15R accessory circuit), airbag control module (SRS) |
| 16-18 | - | Unassigned |
Unit #2
The second fuse box is located in the front passenger footwell, beneath the glove box.
| Diagram | ||
|---|---|---|
|
||
| No. | A | Circuit Protected |
| f1 | 7.5 | Power vent windows |
| f2 | 30 | Front passenger power window, front sunroof |
| f3 | 30 | Driver power window, rear sunroof |
| f4 | 25 | Central locking system, convenience closing module (Komfortschließung) |
| f5 | 10 | Interior lighting, vanity mirror illumination |
| f6 | 20 | 12V Auxiliary power sockets |
| f7 | 7.5 | D-Net cellular phone module |
| f8 | 20 | Anti-theft alarm system (EDW) control unit, EDW alarm switch |
| f9 | 10 | Auxiliary heater relay |
| f10 | 7.5 | Anti-theft alarm horn (EDW) |
| f11 | 7.5 | Left turn signal flashers for EDW anti-theft system |
| f12 | 15 | Right turn signal flashers for EDW anti-theft system |
| f13 | 7.5 | Anti-theft alarm system 2 (EDW 2) |
| f14 | 7.5 | EDW 2 system, anti-theft alarm horn |
| f15 | 7.5 | EDW 2 interior motion sensors (IRS) |
| f16-f18 | - | Unassigned |
Unit #3
Third fuse box location: under the driver's seat.
General overview.
| Diagram | ||
|---|---|---|
|
||
| No. | A | Circuit Protected |
| f1 | 7.5 | ABS, ASR, EBV (EBD) control unit (depending on equipment), air suspension control module |
| f2 | 25 | Rear windshield wiper combination relay |
| f3 | 7.5 | Engine immobilizer control module |
| f4 | 25 | Radiator cooling fan (gasoline engine), intercooler fan (diesel engine) |
| f5 | 25 | ABS/ASR hydraulic unit (valves) |
| f6 | 10 | Immobilizer, automatic transmission control unit (TCM) |
| f7 | 30 | Blower motor / heater fan |
| f8 | 20 | Headlamp washer system relay |
| f9 | 7.5 | Auxiliary heater control module |
| f10 | 25 | Trailer socket, 12V refrigerator socket |
| f11 | 30 | Rear windshield wiper combination relay, tow-away protection (EDW / central locking) |
| f12 | 10 | Climate control module (Heizmatik) |
| f13 | 30 | Air suspension compressor relay |
| f14 | 7.5 | Air suspension control unit, tachograph, auxiliary lighting |
| f15 | 7.5 | Radio main power supply |
| f16 | 15 | Climate control unit, center console switches |
| f17 | 15 | Automatic transmission gear selector switch |
| f18 | 10 | Cellular phone, anti-theft control module, heated exterior mirrors |
| f19 | 15 | Terminal 15 power supply (gasoline engine), crankcase ventilation heater (diesel engine) |
| f20 | 15 | Terminal 15 circuit (gasoline engines) |
| f21 | 15 | Ignition coil power supply (gasoline engines) |
| f22 | 20 | Fuel module — fuel pump fuse (gasoline engines) |
| f23 | 7.5 | Diesel engine control unit (ECU) |
| f24 | 25 | |
| f25 | 10 | Auxiliary heater relay |
| f26 | 25 | Auxiliary heater control unit (diesel engine), stationary heater power supply (parking heater operation) |
| f27 | 25 | Auxiliary heater control module |
| f28 | 15 | Alternator D+ relay circuit, daytime running light (DRL) relay K89 |
| f29 | 10 | DRL relay K69 |
| f30 | 10 | DRL relay K68 |
| f31 | 10 | Terminal 58 power circuit relay |
| f32 | 30 | Left heated seat and power seat adjustment circuit |
| f33 | 25 | Right heated seat and power seat adjustment circuit |
| f34 | 7.5 | Fuel-water separator sensor |
| f35 | 7.5 | Rear climate control / air conditioning |
| f36 | 15 | |
| M1 | 40 | Radiator cooling fan assembly (250 W) |
| - | 60 | Radiator cooling fan assembly (500 W) |
| M3 | 40 | Secondary air injection pump (gasoline engine) |
| Relay Box Under Driver's Seat | |
|---|---|
|
|
| No. | Relay Function |
| K91 | Right turn signal indicator relay (remote central locking system) |
| K90 | Left turn signal indicator relay (remote central locking system) |
| K4 | Terminal 15 power circuit relay (steering column lock 2) |
| K10 | Air suspension compressor relay |
| K19 | Headlamp washer system relay |
| K39 | Fuel pump relay (fuel module) |
| K27 | Seat occupancy detection relay (unloaded seat sensor) |
| K6 | Engine Control Unit (ECU) main relay |
| K103 | Coolant booster pump relay |
| K37 | Horn relay |
| K26 | Alternator D+ circuit relay (steering column lock 3) |
| K83 | Front fog lamp relay |
| K29 | Stationary auxiliary heater relay (ZHE) |
| K70 | Terminal 15 power circuit relay (special equipment) |
| K1 | Starter lockout relay |
| V9 | Anti-theft alarm system (ATA) diode 1 |
| V10 | Anti-theft alarm system (ATA) diode 2 |
| V8 | Stationary heater booster pump diode |
| K71 | Terminal 58 power circuit relay |
| K68 | Daytime running lights (DRL) system relays |
| K69 | |
| K88 | Fog lamp relay 1 (with DRL system) |
| K89 | Fog lamp relay 2 (with DRL system) |