UKPassats

need to change my head unit as I want to be able to connect my phone and listen to podcasts etc.. After stripping my other vehicle down (discovery 2) I decided to make use of the alpine unit from that, I've purchased a fascia kit, harness adaptor and aerial adaptor. The problem I've got now is nothing works and I now have airbag fault come up on the dash!

Am I missing something? Is there a wiring diagram any where for the Passat wires so I can check mine are correct?

I hoping that the air bag warning is just because I'd unpluged the wire connected to the trim if so how do I reset?

Any help would be appreciated