It might not be rocket science as 4g15turbo says, but I'm
wondering if the standard set up is CANBus controlled, in which
case you would have to wire them via a separate fuse box, relays
and switches. Not sure how you can ascertain that, but it would
be something I would check into before proceeding.
But again, a separate fused power circuit with fuses, relays,
and switches is not rocket science either.