If you are converting a W639 Vito into a campervan, you will need to tap into existing circuits. Here is how to use the factory diagram to add a secondary battery:

A recurring issue on the W639 is corrosion at ground points. On any , look for “W” followed by a number (W1, W2, W3). These are chassis ground locations. W1 is typically near the SAM unit, W2 under the driver’s seat, and W3 on the rear chassis.

: Acting as the vehicle's "brain" for body electronics, the SAM manages lighting, central locking, and wiper systems.

Vito W639 Wiring Diagram Jun 2026

If you are converting a W639 Vito into a campervan, you will need to tap into existing circuits. Here is how to use the factory diagram to add a secondary battery:

A recurring issue on the W639 is corrosion at ground points. On any , look for “W” followed by a number (W1, W2, W3). These are chassis ground locations. W1 is typically near the SAM unit, W2 under the driver’s seat, and W3 on the rear chassis. vito w639 wiring diagram

: Acting as the vehicle's "brain" for body electronics, the SAM manages lighting, central locking, and wiper systems. If you are converting a W639 Vito into

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