W639 Wiring Diagram: Vito

★★★★☆ (4.5/5) Deducted 0.5 because even OEM diagrams can be hard to trace without experience – connector location tables are separate PDFs.

The Mercedes-Benz Viano / Vito (W639) is notorious for complex electrical issues. Unlike older vans, the W639 relies heavily on CAN bus networks (interior CAN, engine CAN, and chassis CAN) and multiple control modules (SAM, EIS, ECU, ESP, AC, etc.). vito w639 wiring diagram