I installed a used avic f 700bt yesterday I followed all the threads on here and hooked up the unit to my 2006 pontiac gto and it works except that the navigation settings and system settings cannot be accessed. The bluetooth won't sink with my iphone, and the usb cord recognizes my iphone 4 and plays the song yet no volume comes out of the speakers. The gps works and gives my current location yet, I am unable to input an adresss for a new destination. The sd card with a new image is not detectible. Even with all these problems it still plays cd's, I have searched the avic forum and similar pr