hi all,
this thing is at my car last time i got A12,
which the previous owner (my dad) install it.
but when i transplant to A15, it is not connected..

i post the picture i taken.




anyone knows how to connect this thing?
what is this thing anyway?
i have ask my dad but he cant recall what it is.

there is 4 wire comes out from it, blue, yellow, green and black,
i assume that black is ground,
the rest i not sure.

anyone can teach me please?



thanks in advance.