If your GX470 has no Navigation Screen here are instructions on how to install the OEM AC Board -
GX470 AC Controls Issue needs OEM Mother Board
Youtube Video for GX470 Installation with premium unit.
https://www.youtube.com/watch?v=Y8kqz9Dxac0
All other GX470 and LandCruiser is plug and play
If unit does not turn on - possible a connector is 7pin? 16pin? forgot which one
but there are 2 connectors that look identical they might be plugged to the wrong one - switch the 2 connections
and unit should turn on
This Vehicle Land Cruiser - Also Needs to Use OEM Navi Board - Connect the pink cable to the OEM AC control Button Connector
(Land Cruiser 120 LC5 Year 2008) 
Back of OEM Unit
Model Of Unit
