Just an update. My trusty talyer guy just did what Lexus BGC wasn't able to do. This was to find and fix the error showing in my NX300's dash. Apparently, my unit's ecu wasn't even fried so it didn't require repairing. Rat bites chewed off some of the electricals so my talyer guy painstakingly inspected each and every one of 'em and cleaned 'em up so my unit is now error free and running properly. Yahooo!!!