I have the same HU but all I know is there's an aux input at the back of the HU....It says you have to manually turn aux to on then you can adjust volume by pressing source/power then selecting aux. I think the cable is called V-Link
check the manual on page 12 of this site, under aux mode
http://vault.alpine-usa.com/products/documents/OM%20CDA-9827.PDF
hope that helps,
oh btw the fm tuner on mine cant lock to a signal for about 15-20 mins. I'm about to smash it to smithereens, lol
