The Mercedes-Benz Vito (W639) is a rear-wheel or all-wheel drive van available in three body lengths (4,763 mm, 5,008 mm, and 5,238 mm), two wheelbase configurations (3,200 mm and 3,430 mm), and four gasoline or diesel engine options paired with either a six-speed manual or a five-speed TouchShift automatic transmission. This guide provides detailed fuse box diagrams and relay assignments for the second-generation Mercedes-Benz Vito (W639) produced from 2003 through 2010.
Below are the location guides, component layouts, and fuse charts for the power distribution boxes. Fuses for the “Cigarette Lighter” and “Fuel Pump” circuits are highlighted in bold.
Passenger Compartment Fuse Box
The passenger compartment distribution box is located beneath the driver’s seat.
Turn the quarter-turn latch to release the panel access door.
Remove the protective housing cover to access the fuse blocks.
| Under-Seat Fuse Box Layout | ||
|---|---|---|
|
||
| No. | Rating (A) | Protected Component / Circuit |
| 1 | 25 | Left front door control unit |
| 2 | 25 | Right front door control unit |
| 3 | 25 | Parameterizable special module (PSM) control unit |
| 4 | 25 | |
| 5 | 15 | 12 V auxiliary socket (under passenger seat) |
| 6 | Unassigned | |
| 7 | 7.5 | Auxiliary heater timer and control illumination |
| 8 | 25 | Auxiliary heater unit |
| 9 | 25 | |
| F6 | 80 | Signal acquisition and actuation module (SAM / SRB) |
Engine Compartment Fuse Box
Located on the right side of the engine compartment.
Distribution box module arrangement:
No. 1: Main fuse board,
No. 2: Fuse block F4,
No. 3: Fuse block F5,
No. 4: Main prefuse F1,
No. 5: Auxiliary panel F34,
No. 6: Auxiliary panel F35
Overview of the main fuse board assembly.
| Main Fuse Board Diagram (Slot No. 1) | ||
|---|---|---|
|
||
| No. | Rating (A) | Protected Component / Circuit |
| 1 | 30 | Windshield wiper motor |
| 2 | 15 | Dual-tone horn |
| 3 | 5 | Brake light switch |
| 4 | 7.5 | Heater / climate control system |
| 5 | Diagnostic connector (OBD-II) | |
| 6 | 5 | Instrument cluster and vehicle electronics |
| 7 | 30 | Rear window wiper motor |
| 8 | 10 | Terminal 87 (Circuit 1) |
| 9 | 15 | Terminal 87 (Circuit 2) |
| 10 | 10 | Terminal 87 (Circuit 3) |
| 11 | 7.5 | Terminal 30 (Motor 2) |
| 12 | 30 | Heated rear window |
| 13 | 7.5 | Electronic ignition lock (EIS) / Drive authorization system (DAS) |
| 14 | 7.5 | Brake system control unit (ABS / ESP) |
| 15 | 5 | Headlight range adjustment module |
| 16 | 25 | Starter motor relay |
| 17 | 15 | Fuel delivery module (Fuel pump fuse) |
| 18 | 15 | Cigarette lighter socket |
| 19 | 5 | Audio head unit / Radio |
| 20 | 15 | Ignition system (Gasoline engines) |
| 21 | 7.5 | Transmission control module (TCM) |
| 22 | 7.5 | Tachograph |
| 23 | 10 | Supplemental Restraint System (SRS / Airbag) control unit |
| 24 | Unassigned | |
| 25 | 5 | Trailer recognition control module |
| 26 | 5 | Battery cut-off / isolating relay |
| 27 | 5 | Terminal 15 circuit |
| 28 | 10 | Powertrain control unit |
| 29 | Unassigned | |
| 30 | ||
| 31 | 10 | Anti-theft alarm system (EDW) siren |
| 32 | 5 | VICS / Mobile phone interface |
| 33 | 10 | Airbag / Automatic child seat recognition (AKSE) |
| 34 | 5 | Terminal 15 circuit |
| 35 | 7.5 | Sliding sunroof control unit and drive motor |
| 36 | 10 | Power seat adjustment control module |
| 37 | 7.5 | Vanity mirror illumination |
| 38 | 7.5 | Rear passenger compartment power circuit |
| 39 | Unassigned | |
| 40 | 10 | Common Rail Diesel Injection (CDI) control unit |
| 41 | 10 | |
| F1 | 150 | Terminal 30 main power supply / Alternator |
| F4 | 60 | Air conditioning blower fan |
| F5 | 40 | Auxiliary engine cooling fan |
| No. | Relay Assignments | |
| 1 | Horn relay | |
| 2 | Windshield washer pump relays (Speed 1/2) | |
| 3 | ||
| 4 | Engine control module (ECM) relay | |
| 5 | Starter relay | |
| 6 | Fuel pump relay | |
| 7 | Circuit 15 ignition relays | |
| 8 | ||
| 9 | Heated rear window relay | |
| Auxiliary Fuse Board F34 Diagram (Slot No. 5) | ||
|---|---|---|
|
||
| No. | Rating (A) | Protected Component / Circuit |
| 21 | 5 | Master light switch and overhead control panel |
| 22 | 7.5 | Rear passenger compartment accessories |
| 23 | 10 | Interior dome lights |
| 24 | 7.5 / 25 | Sliding sunroof motor |
| 25 | 25 | Panoramic glass sunroof motor |
| 26 | 5 | Audio head unit / Radio |
| 27 | 7.5 | Air conditioning system / Rear compartment accessories |
| 28 | 15 | Rear compartment auxiliary sockets |
| 29 | 7.5 | Mobile phone interface / LINGUATRONIC voice control module |
| 30 | 30 | Heated seats |
| 31 | 5 | Tachograph module |
| 32 | Unassigned | |
| 33 | 10 | Diagnostic connector (OBD-II) |
| 34 | Unassigned | |
| 35 | 5 | Tempmatic automatic climate control module |
| 36 | 30 | Headlight washer system pump |
| 37 | 10 | Anti-theft alarm system (EDW) siren |
| 38 | 20 | Electronic steering column lock (ELV) |
| 39 | 40 | HVAC blower motor |
| 40 | 25 | Anti-lock Braking System (ABS) control module |
| 41 | 40 | |
| 42 | 15 | COMAND infotainment system / Radio |
| Auxiliary Fuse Board F35 Diagram (Slot No. 6) | ||
|---|---|---|
|
||
| No. | Rating (A) | Protected Component / Circuit |
| 21 | 15 | 12 V socket (left B-pillar) |
| 22 | 15 | 12 V socket (left C-pillar / rear compartment) |
| 23 | 30 | Trailer electrical towing socket |
| 24 | 25 | Trailer recognition module |
| 25 | 30 | Power driver seat adjustment module |
| 26 | 30 | Power passenger seat adjustment module |
| 27 | 30 | Left power sliding door actuator |
| 28 | 30 | Right power sliding door actuator |
| 29 | 30 | Rear climate control blower fan |
| 30 | 40 | Air suspension compressor power supply |
| 31 | 10 | Parktronic system (PTS) module |
| 32 | 5 | Tire pressure monitoring system (TPMS) |
| 33 | Unassigned | |
| 34 | 5 | Mobile phone module / TV tuner signal amplifier |
| 35 | 20 | Auxiliary heater control unit |
| 36 | Unassigned | |
| 37 | 5 | Air conditioning compressor control |
| 38 | Unassigned | |
| 39 | ||
| 40 | 15 | 12 V auxiliary socket |
| 41 | 10 | Roof-mounted auxiliary turn signal control module |