Pretty sure that can't be done
The 09 ADM cars had an analogue unit, whereas 2010 ADM with sat nav, higher res screen etc is a digital unit
The JDM was always a digital unit I believe, so you'd need to be tinkering with a unit out of a 2010 ADM build car
If you haven't already bought a JDM, I'd just go the extra mile for an ADM 2010 build. Will give you all the mod cons and hold it's value better
The brains of the unit is behind the cd slot, I've gotten behind there to bypass the DVD inmotion lock out, it all looks very well integrated back there, I highly doubt it's a simple switch