TSB: Certain 2010 ? 2013 model year Lexus models may exhibit one or more of the following conditions:
? Steering wheel volume controls are intermittently inoperative.
? Navigation system region code intermittently will reset to region US9.
? XM NavTraffic® will not function properly after renewing XM traffic subscription.
? Slow response from Bluetooth® address book voice commands.
? Black screen condition after shifting from Reverse to Park.
? Air conditioning screen may not appear when changing blower speed.
? iPod® scrolling speed is slow.
? Display constantly shows ?Calculating? on right side of screen while driving on freeway.
? Slow response at times from navigation system even at startup.
? GPS coordinates shown instead of destination address.
? Display locks up and appears unresponsive after periods of time.
? Touch screen (if equipped) functions are slow to respond.
Navigation firmware has been updated to allow updating map to version 10.1 or later. Updated navigation system software has also been developed to remedy these conditions.