No audio from 2011 RX350

[Rzgary]

My wife isn't getting any sound from the speakers of her 2011 RX350.  It looks as if the head unit is functioning.  Nav has no audio, Bluetooth has no audio but I can hear her when she calls me.  One pop when the car is started is all I can hear.  All three fuses are good.  This is a Pioneer system, not the ML system.  Has anyone had this problem before or have any idea what it might be?  Thanks in advance for any ideas.

Gary