Hi,
I own 2007 Lexus ES35o was told by charleston, SC LEXUS dealer that AMP was blown it would cost $900 to replace the amp. Then the radio would work then not work. Went in trunk passenger side removed side wall cover and UNPLUG ALL FOUR CONTRACTORS TO THE AMP , WAIT FOR 1 MINUTE RADIO REST AND WORK JUST FINE !!!!! SAVED MYSELF $900 AND 125 MILE TRIP.