This comprehensive wiring manual is specifically designed for Mercedes VITO VIANO vans, model 639. It provides detailed wiring diagrams and technical information that cover the entire electrical system of the vehicle. The manual features numerous sections, each focusing on a specific aspect of the electrical system. You'll find detailed explanations on the use of wiring diagrams, a comprehensive list of abbreviations used throughout the manual, and the precise location and assignment of ground points and plug connectors.

The manual delves into the specifics of the battery starting and charging circuit, voltage supply fuses, and the fuse and relay board (SRB). It thoroughly covers the Signal Acquisition and Actuation Module (SAM), providing insights into its functions and connections. The manual also includes dedicated sections detailing the workings of exterior lights, central locking systems, the CAN bus network, the instrument cluster (IC), the electronic ignition switch (EIS), electronic stability control (ESP), common rail diesel injection (CDI) system, and the standard heater. This extensive coverage ensures you have the necessary information to understand, troubleshoot, and repair the electrical system of your Mercedes VITO VIANO van.

The Mercedes-Benz Vito and Viano, model code 639, represent a successful generation of mid-sized vans produced from 2003 to 2014. This period saw the introduction of the Vito nameplate, replacing the "Vito" moniker previously used for a smaller van. The 639 series marked a significant evolution, offering a broad range of configurations and powertrains to cater to diverse needs. From passenger-oriented Viano models to robust Vito workhorses, the 639 provided a flexible platform for both commercial and private use.

Beneath its distinctive exterior, the 639 series leveraged Mercedes' well-established engineering prowess. It incorporated a robust steel frame chassis, underpinning a versatile body that could be tailored to specific applications. The powertrain options spanned a range of four-cylinder diesel engines, with varying power outputs and transmissions, including manual and automatic gearboxes. The 639 series also introduced innovative safety features for the time, like electronic stability program (ESP) and anti-lock braking system (ABS) as standard, enhancing both driver and passenger safety. The wiring manual for the 639 series serves as a comprehensive guide for technicians and mechanics, allowing them to navigate the intricate network of electrical systems powering the vehicle's numerous functionalities. Its detailed diagrams, schematics, and explanations provide invaluable support for troubleshooting, diagnostics, repairs, and modifications, ensuring the smooth operation of these versatile and enduring vans.