Map wiring

Good day.

Does anybody have a wiring diagram for this or can at least point me in the direction of?

I have 3 wires - a black, a brown and a lilac/green

Basically my garage needs to know what wire goes in what pin and that there are 4 pins? As currently it has baffled a vag electrician and obviously the garage won't repair it until they are 100% sure on what goes where.

Oh it's a 2006 tfsi with engine code BWA.

All help much appreciated.