I recently had a problem that my Kenwood receiver, along with the Kenwood ipod attachment, it could not read my ipod. This would *&$# me off big time because I would have to disconnect it, turn off my SUV, restart the ipod, reconnect it, and praying to GOD that it would work this time! Most cases it would take me around 10 tries.......

Kenwood has a fix for this problem and here is the link:
http://www.kenwoodusa.com/Support/Car_Entertainment/

Remember to this file DOES NOT go on you ipod, rather, it goes on a USB memory stick. Print out the one page directions(which are easy to understand)and bada-bing bada-BOOM! I havn't had a problem since.
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2 subs---------------------->Kenwood eXcelon KFC-XW12R
2 amp subs---------------->Kenwood eXcelon KAC-X1R
Door speakers------------->Kenwood eXcelon KFC-1720P
Amp for door speakers--->Kenwood eXcelon KAC-X40
Head unit------------------>Kenwood eXcelon KDC-X791 w/iPod Direct (KCA-iP200)
Dynamat on all four doors, plus trunk gate.
Optima Yellow Top
0ga wire
WISHLISH--------> HO Alternator