The above Apple devices when running iOS version 4.1 and up have had connectivity issues with Toyota audio headunits when connected via USB. When users attempt to access their iPod/iPhone's music collection via the stereo's interface, the audio system remains stuck on a load screen until another source is selected or the iPod/iPhone is disconnected.
Music from owners' iPods/iPhones can still be heard via either an auxiliary cable or Bluetooth streaming. This, though, means tracks cannot be controlled via either the track/skip button on the headunit or the steering wheel audio controls.
According to Toyota, a firmware for affected audio headunits is now available. Owners who are suffering from this issue are advised to contact their dealer so the new software can be installed. Cars produced from March 2011 will feature headunits sporting the revised firmware.
Update: According to Toyota, this problem affects all USB-equipped, non-navigation sound systems on imported vehicles — so that's everything except the Camry and Aurion.