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I have a problem in finding out what size USB drive I can use. I have tried 2 different 16Gig USB thumb drives and both did not work. I formated them to fat32 and still not seen. I have a 4 gig that woks fine. What size's should work and whats the deal on brand? Is there a size and type of SD card I need. Will an HC card work? can I use a 16 gig card?

I have a 2009 Honda Accord Sedan, EX V6, with the factory 6 speaker, non duel heat controls, that I installed the AVIC-110BT into. I can not locate the VSS vehicle speed signal wire.. Can any one help?