Tranferring iPhone Phonebook to 790BT via BT

[81Tiger04]

I have an iPhone 3GS and a Pioneer 790BT in my car. Getting the two units to connect is no problem. I’ve registered my iPhone with the 790BT, so it also connects each time I get in the car with no problem. The problem is when I try to transfer my phonebook to the 790BT. I press “Yes” to begin the transfer, but the Bluetooth connection is lost. This happens every time. Am I doing something wrong? Is it possible to transfer your phone book?

 

[81Tiger04]

Anyone? Why would the BT connection be lost when trying to transfer the phonebook. It doesn't seem to happen any other time.