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


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