I've read a few retrofits using GM homelinks. Got this idea to retrofit a BMW homelink so its sort of OEM.

This is what I started with


Here is the homelink


Cutting up the trim piece


Ended up with this:



Now my problem is the wiring. Followed crucial fiction's thread re the purple wire (here). And I do get +12V out of it. I even used the brown wire from the same connector but the homelink doesnt work. I even grounded the unit to the sunvisor bolt. and while I get 12V out of my tester the unit doesnt respond. I went ahead and swapped and reprogrammed the new part with my E39 and it works as it should. But with the wiring identified on the mini it doesnt work

I've been at this for a few hours now. Would appreciate any input. What Am I doing wrong???