Extensive wiring diagrams covering the Signal Acquisition and Actuation Module (SAM) , CAN bus architecture, instrument clusters, and electronic ignition switches (EIS).
Platforms like Mercedes Workshop or Workshop Manuals offer interactive PDF or software-based manuals that provide the same data used by official dealerships. w639 workshop manual
Guides for both manual and automatic gearboxes, including specific oil capacities, torque specifications for drain plugs, and installation steps. CAN bus architecture
Step-by-step instructions for replacing front suspension struts, coil springs, and anti-roll bar links. including specific oil capacities
Companies like Brooklands Books publish physical Vito & Viano Workshop Manuals which are compiled by experts and cross-checked against official manufacturer data.
There are several ways to access this information depending on your needs:
Sites like AUTODOC CLUB provide free, illustrated PDF replacement guides for common maintenance tasks like fuel filter or serpentine belt changes.