Hello, I have a DEH-P4500MP Pioneer HU, The manual shows how to change your source to aux but says nothing about how to hook up an aux input

... so, I searched on the forums here and came up with the CD-RB10 adapter as a possible solution. Ebay here I come, well I found
this and the ad says its for P-Bus receivers. Question is, is my HU a P-Bus receiver? Is that maybe what the P in the model Number is? and will this adaptor work with my HU?
Edit: <sigh> or is it IP-Bus