The Mercedes-Benz Vito/Viano W639 is a mid-size van that is produced by the German automobile manufacturer from 2003 to 2014. It is available in various body styles, including panel vans, minibus, and pickup trucks. The W639 model is the second-generation Vito/Viano and is built on the same platform as the Mercedes-Benz V-Class. The Vito/Viano W639 is known for its durability, reliability, and versatility, making it a popular choice for commercial and personal use.
One of the key components of the Mercedes-Benz Vito/Viano W639 is its electrical system. The vehicle is equipped with a fuse box and relay that control various electrical components, including the lights, wipers, power windows, and central locking system. In this article, we will explore the different aspects of the Vito/Viano W639’s electrical system, with a particular focus on the fuse box and relay diagrams and their locations.
Fuse Box and Relay Diagrams
The Vito/Viano W639 is equipped with two fuse boxes: one in the dashboard on the driver’s side, and one in the engine compartment. The dashboard fuse box is located behind the cover on the driver’s side of the dashboard. It contains fuses that control the lights, wipers, power windows, and other electrical components. The engine compartment fuse box is located on the left side of the engine compartment, next to the battery. It contains fuses that control the engine and other electrical components.
The Vito/Viano W639 is also equipped with several relays that are responsible for controlling various electrical components. The relays are located in the engine compartment, next to the fuse box. They control components such as the starter motor, fuel pump, and air conditioning compressor. The relays are labeled according to their function and are easily identifiable.
Electrical Components
The Vito/Viano W639’s electrical system controls a range of components, including the lights, wipers, power windows, and central locking system. The lights include the headlights, taillights, and indicators. They are controlled by a combination of fuses and relays located in the fuse boxes and engine compartment. The wipers are also controlled by a combination of fuses and relays, and the power windows are controlled by fuses located in the dashboard fuse box.
The central locking system is another important electrical component of the Vito/Viano W639. It is controlled by a combination of fuses and relays located in the dashboard fuse box. The central locking system allows the driver to lock and unlock all doors and the tailgate with a single button. It also includes a security system that detects if the doors or tailgate are opened without a key and triggers an alarm.
(2003-2014) Mercedes-Benz Vito/Viano W639 fuse box and relay with Diagram
The execution of the boxes and the purpose of the elements in them may differ from those presented and depend on the year of manufacture and the level of electrical equipment.
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
Engine compartment
Under the hood, the main fuse box is located on the left or right of the engine compartment, behind a protective cover, and consists of several sections.
Fuses
Engraved upper section
Diagram
Assignment/Designation
| 1 | 30A | Wipers |
| 2 | 15A | Horn |
| 3 | 5A | Stop lamp switch |
| 4 | 7.5A | Heating |
| 5 | 5A | Diagnostic socket, rotary light switch, instrument cluster |
| 6 | 5A | Engine components |
| 7 | 30A | Rear wiper |
| 8 | 10A | Terminal 87 (1) |
| 9 | 15A | Terminal 87 (2) |
| 10 | 10A | Terminal 87 (3) |
| 11 | 7.5A | Motor terminal 30 Z |
| 12 | 30A | Heated rear window |
| 13 | 7.5A | Ignition switch/instrument panel |
| 14 | 7.5A | Brake system |
| 15 | 5A | Headlight range adjustment |
| 16 | 25A | Starting motor |
| 17 | 15A | Fuel pump |
| 18 | 15A | Cigarette lighter/glove box lighting |
| 19 | 5A | Radio |
| 20 | 15A | Ignition coils M112 |
| 20 | 5A | Diesel HFM |
| 21 | 7.5A | Automatic transmission |
| 22 | 7.5A | Tachograph |
| 23 | 10A | Airbag control unit |
| 24 | 5A | Rearview mirror |
| 25 | 5A | Trailer control unit |
| 26 | 5A | Trip relay |
| 27 | 5A | Terminal 15 body/equipment manufacturer |
| 28 | 10A | Transmission control unit |
| 29 | 5A | Hill start assist |
| 30 | – | Reserve |
| 31 | 10F | ATA signal |
| 32 | 5A | Mobile phone / VICS connector |
| 33 | 10A | Airbag, automatic child seat recognition |
| 34 | 5A | Terminal 15 R body/equipment manufacturer |
| 35 | 7.5A | Top control panel |
| 36 | 10A | Lumbar adjustment (seat) |
| 37 | 7.5A | Illuminated makeup mirror |
| 38 | 7.5A | Rear Entertainment |
| 39 | – | Reserve |
| 40 | 10A | Engine fuse (diesel) |
| 40 | 20A | Engine fuse (petrol) |
| 41 | 10A | Engine fuse (diesel) |
| 41 | 20A | Engine fuse (petrol) |
| F1 | 225A | Terminal 30, electrical system, generator |
| F4 | 60A | Air conditioning fan (cooling unit) |
| F5 | 40A | Secondary air pump |
Lower right section
Diagram
Assignment/Designation
| 21 | 5A | Light switch and control panel top |
| 22 | 7.5A | Rear Entertainment |
| 23 | 10A | Interior light |
| 24 | 7.5/25A | Upper control panel and sliding/tilting sunroof |
| 25 | 25A | Sliding/Hinged Roof, Rear Compartment |
| 26 | 5A | Auxiliary heater, radio |
| 27 | 7.5A | Air conditioning in the front of the cabin |
| 28 | 15A | Rear entertainment outlet |
| 29 | 7.5A | Mobile phone/CD changer/microphone control module |
| 30 | 30A | Heated seat controls |
| 31 | 5A | Tachograph |
| 32 | 5A | Diagnostic Gateway |
| 33 | 10A | Diagnostic connector |
| 34 | 15A | Audio gateway |
| 35 | – | Reserve |
| 36 | 30A | Headlight cleaning system |
| 37 | 10A | ATA battery beep |
| 38 | 20A | Steering column lock |
| 39 | 40A | Front compartment fan |
Lower left section
Diagram
Assignment/Designation
| 21 | 15A | 12 V socket in passenger compartment on the left |
| 22 | 15A | 12 V socket in passenger compartment on the right |
| 23 | 20A | Trailer socket |
| 24 | 25A | Trailer recognition unit |
| 25 | 30A | Driver seat adjustment |
| 26 | 30A | Co-driver seat adjustment |
| 27 | 30A | Electric sliding door left |
| 28 | 30A | Electric sliding door right |
| 29 | 30A | Rear compartment fan |
| 30 | 40A | Air suspension system |
| 31 | 10A | Parktronic |
| 32 | 5A | Tire pressure sensor |
| 33 | 25A | Audio system |
| 34 | 5A | Mobile phone control unit / VICS, TV Booster |
| 35 | 20A | Independent heating control unit |
| 36 | – | Reserve |
| 37 | 5A | Rear air conditioning system |
| 38 | 7.5A | COMAND camera control |
| 39 | 5A | Ordinary taximeter |
| 40 | 15A | 12 V socket, rear right |
| 41 | 10A | Roof turn signal control unit |
| 42 | – | Reserve |
Fuses number 21, 22 and 40 for 15A are responsible for the operation of the cigarette lighter.
Relay
Diagram
Decoding
| R1 | Horn relay |
| R2 | Wiper relay #1 |
| R3 | Wiper relay No2 |
| R4 | Power relay; |
| Engine management. | |
| R5 | Starter relay |
| R6 | Fuel pump relay |
| R7 | Relay contact 15R |
| R8 | Relay contact 15R |
| R9 | Heated rear window relay |
| R10 | Relay contact 15R |
| R11 | Relay contact 15R |
| R12 | Headlight washer relay |
| R13 | Secondary air injection pump relay |
Passenger compartment
In the cabin, the fuse box is located on the side of the driver’s seat.
Diagram
Assignment/Designation
| F6 | Signal Acquisition and Excitation Module (SAM) / Fuse and Relay Box (SRB) / Engine Control Module, Ignition Switch, Instrument Cluster | |
| 1 | 25A | Door control unit, left |
| 2 | 25A | Door control unit, right |
| 3 | 25A | Control unit for a parameterizable special module |
| – | Reserve (for China) | |
| 4 | 25A | Control unit for a parameterizable special module |
| – | Reserve (for China) | |
| 5 | 15A | 12 V socket on front passenger seat frame |
| – | Reserve (for China) | |
| 6 | – | Spare |
| Accessory for travel car/van [1] | ||
| 7 | – | Spare |
| 8 | – | Spare |
| Accessory for travel car/van [1] | ||
| 9 | – | Spare |
| Accessory for travel car/van [1] | ||
| 10 | – | Spare |
| 11 | – | Spare |
| 12 | – | Spare |
| 13 | 15/20A | Radio / COMMAND system / 1st and 2nd DIN socket |
| 14 | 7.5A | Mobile phone retrofit equipment / rear passenger entertainment system |
| 15 | 5A | Tachograph / Media Interface |
| 16 | 25A | Speaker system |
| 17 | 5A | Taximeter |
| 18 | 25A | Roof control panel/ sliding sunroof |
The Mercedes-Benz Vito/Viano W639 is a versatile and reliable mid-size van that has been a popular choice for commercial and personal use. Its electrical system, including the fuse box and relay diagrams with locations, is an essential component that ensures the proper functioning of the vehicle’s lights, wipers, power windows, and central locking system. Understanding the different aspects of the Vito/Viano W639’s electrical system is crucial for any owner or mechanic working on the vehicle, and this article has provided an in-depth overview of the topic.
More information about the repair and maintenance of the Mercedes Vito 639, you can find in this original manual: “download.”
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