Mercedes-Benz Vito/Viano W639 fuse box and relay (2003-2014)

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.

MUST READ: DYI – How to Check Car Fuses?

(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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