I wouldn't get the stealers to re-wire it, take it to a proper good reliable independant auto electrician, will prob work out cheaper than the stealers and get a better job done too.
Wiring diagrams are in the service manual for them to reference to. If you are good with wiring, you could always do it yourself. As for why it's changed, I have seen some REALLY shady wiring in some cars coming over from Japan, you would think that being the most technologically advanced place on earth they would know how to wire, but it appears quite a few of their bodges end up here for people like myself to sort.
example...
before pic, 23 out of 48 wires melted together!! Luckily it never cought fire. :shock::shock:
After my hard graft