Right ... firstly there is no terminal on the connecting plug and which corresponds to the "TFL" (German for daytime running lights) pin on the light switch. You will have to insert a terminal! I suggest that you obtain a wired plug from a breakers and extract a terminal/wire. Next, the only sensible route to get that wire into the engine compartment is to feed it under the dash and across to the passenger foot-well Remove the fuse cover/housing on the drivers side to do this, and all the carpeting on the passenger foot-well Fairly high up and corresponding to the upper level of the rubber sound deadening, you will see a rubber gromet with a cable passing through it. This is a path which will take your wire through to to wheel arch. You will need to access this area by removing the wheel and under-arch cowling. After the wire is fed into this area you will see an obvious route into the engine bay! Protect the wire, full length, with fabric insulating tape (Ala Audi!) This is some PIG of a job, but it is the only way if you want to do the work correctly!