I know this is an old thread, but did your voice commands still work although the SatNav was inoperable?
I have the same error message but, voice commands is also unresponsive? (his happened after replacing the battery)
Hi katsumitsu
Please post your findings!!!! My father's Lexus (IS205SE 2007) has the same error message after replacing the battery and his Lexus dealer knows nothing. (They can change the oil, but electronics is to technical for them)
Regards