If the MFD has a message that says "DAU Not Configured for Aircraft Type" or something to that effect. Have shop check the Aircraft Type Designator / Strapping wire per the Piper Maintenance Manual.
This is nothing more than a ground wire that configures the aircraft type.
Piper Seminole DAU Connector P103-9 to airframe ground
Piper Seneca V DAU Connector P103-9&10 to airframe ground
Piper Warrior III DAU Connector P305 - 8, 9, & 10 to airframe ground
So as you can see the Aircraft Type Designator is nothing more then a strapping wire to ground.