Hi there,
As a very new member, and previous sufferer of the P0410 code, I understand you pain.
I have rectified my light issue by bypassing the relay with an external diode protected relay that sits in the fuse box.
It can be troublesome getting parts down in rural Australia.
So I bypassed the weaker relay with a more robust type, and issue solved.
If you wish I can draw up a wiring diagram and some pictures to upload, most people should be able to fit one with out any bother.
Cheers
Old Breed.