touchscreen

Hello, I recently purchased a used avh p1400 pioneer deck of eBay. I installed it my self and everything seems to work except I can't use any of the touchscreen buttons nothing happens when I tap the screen anywhere. Could this be a wiring issue or did I just get ripped off?

I bought this head unit last year for my car. Overall, it's worked well, but just had a pretty serious issue spring up this week. The touchscreen works absolutely fine when the audio controls are displayed. But when I switch the display to the navigation view, the touchscreen becomes...