According to my research: Pin 1: CAN_V+ (optional, supply voltage) Pin 2: CAN_H (dominant high) Pin 3: CAN_L (dominant low) Pin 4: CAN_GND (ground)

Installing the radio in a Mercedes Viano 2.2 CDI from 2014 is technically possible, as the radio has a 2-DIN format. However, you may need a special fitting kit to adapt it to the existing gap in the dashboard. Such a kit should convert the non-DIN sized opening into a DIN sized one to easily fit the radio. It is advisable to consult a professional for the installation to ensure that all connections are correct and the radio works properly.

As there is no essential information about which camera etc. you have installed, it would probably be best if you contact Pioneer directly. E-mail: mail@sacom.ch / Website: https://pioneer-car.eu/ch/de/support You may also be able to find the information you need in the installation instructions: https://pioneer-car.eu/asset/installation_manuals/UPLOAD_ID_19241/075524d749c0b7f192db6fd552516e9093e0b43d/

You can do this on pioneer-car.eu Look under For my car