I had a Z150BH professionally installed in my Maserati and installed one myself in my Nissan Frontier.  The Frontier works fine as did the Maserati but now having issue with Maserati and Pandora.  My iPhone 5 is connected directly to the AVIC with appropriate cables and Pandora does play if I start it on my iPhone but the AVIC says it cannot connect and I have no control through the AVIC. The AVIC display shows the Pandora skin but no data appears and no control buttons appear.  I have restarted the vehicle several times over several days and rebooted the iPhone.

Try installing the Jan 2014 1.06 firmware update from Pioneer. This update is supposed to fix this issue.

Definitely. Pandora did not work properly until the Jan 2014 firmware update. With it, Pandora works as expected.

You can get the firmware here:

http://www.pioneerelectronics.com/PUSA/Car/GPS-Navigation/AVIC-Z150BH

then click the Firmware and Software button to get to the file and the instructions as to how to install it. It's very easy to do.

I will say in my experiance that updating my Z150BH to 1.06 pretty much bricked the navigation so use caution. After updating, my nav quit responding to gps signals.