Which pio model is it? it's a LCD screen that got a CD player (no DVD)?!?! Weirds...see, my idea is to replace the Kenwood POS with either a pio or Alpine DVD player/LCD. Both are more reliable and should have better SQ.
Likewise, the Pio you have is probably better than the Kenwood...it's kinda silly to have a redundant system like that. The Kenwood's SQ isn't really spectacular (though it's not terrible either). You'd also need to get the kenwood's input cable to accept input from the Pioneer (for if you're watching movies, etc.). It just seems like pickin one or the other is really a better choice...but I maybe I need to understand your reasoning a bit better for wanting to use both...