The Six-Disc Radio on my '05 stopped working. There is no audio output in any mode and no indication that the volume control function is working (no volume slider display). Attempting to change the volume from the steering wheel volume control or the radio volume control does nothing. All the oher control functions seem to work fine, the tuner tunes for all bands, the CD goes though all of its actions - but no output in the speakers. I wouldn't rule out operator error but I gain no insight from the owner's manual and probably being a EE doesn't help! I checked a 25 amp fuse labeled AMP which was ok. I suspect there is a control head and a separate amplifier but since the '05 service manuals are not available yet, I am dead in the water about to head back to the dealer (why do these things always happen on the weekend?) Anybody have any insight into this 'no speaker output' problem?