Since no one else responded I'll just say if you haven't already, take it in. Warranty shouldn't have a problem fixing it.
Originally Posted by tvkel
I've had my 2010 RX350 for about a month and just this week the handsfree button stopped working. Nothing. Nada.
Is it a fuse? Anyone else have this happen? I have to make a long road trip and this feature would be very nice to have while I'm driving. Thanks!