Greetings from the uk! just completed an install in my 05 prius with no factory nav but jbl sound system, install went smoothly i used the metra wiring adaptors and i bought a prius specific harness for the axxess steering wheel controls and it seems to make my steering wheel backlights still operate somehow!? from what i have read these would fail to illuminate once factory deck was removed? anyway great helpful information on this site i had to order all the parts over from US as nothing is sold over here to do the swap! as far as i can tell hardly anybody (if anybody) has done a 2 din head unit swap in the UK!