I have an Acura ZDX and was able to pair my 3G / iOS3 both via BT and USB successfully. Now with my iP4 I can pair and use my iP4 as an iPod via BT, using the iP4 to change songs; under USB it seems to connect and load the data and songs, but it will not play a selected song using the Acura NAV monitor to select. Anyone else who has an Acura have this issue? Anyone else having similar computability issues with their car?