We got the DVD navigation system with our 05 Prius but there was little if any mention of "Voice-Activation" in the owners manual. I noticed it looks pretty much the same as my 08 Lexus IS250 so we've recently been using the DVD-Nav supplemental manual that came with the Lexus for the Prius. Most things seem similar but is there an online manual anywhere for the Gen 4 Toyota system? Also, is the DVD Nav rearview camera retro-fittable to the 05? Thanks!