Few questons

[harryberlin]

you don't need a relay. the relay are optional for rearcam or autom. gearshift control.

for switching the tv-modul to input source, what we use, you need to connect the gpio 7 (or with ibuscommunicator the resler ntsc cable)

in sub forum download exist a raspcontrol image v1.9 with helgeinterface.
in sub forum ibuscommunicator i have placed two images. ver.4 if you don't have connected a bluetooth usb dongle. ver. 5 with bt dongle.
in both cases the basic images are from osmc.tv

for wifi connection you have to use the osmc tool.