I apologize ahead for the double-post to those who visit ASEC's site as i posted this same problem over there. but here it is: Got a problem with my Pioneer DEH P2500 deck. I ordered the Pioneer RB-20 ip-bus unit so that i could hook up my i-Pod via RCAs. Well i got everything hooked up with the p-bus and then plugged in the minijack to the iPod's headphone jack, turned the stereo on. well i pushed every button on that unit (including the function button which should switch back and forth from cd-radio-aux) and nothing doing. the p-bus was not being read at all from the stereo. even had the iPod playing, cranked up and everything. the deck would only switch from radio-cd. My owner's manual for my deck specifically said it was compatible with the RB-20 so i don't understand why it will not switch over to AUX. btw, i had my co-workers working on it--roadshop installers at Circuit City--so i know they know what they're doing as far as installing. the problem seems to lie either with my deck or the ip-bus. can anybody offer any advice?