Anyway around taking my 2008 tls to the dealership to pay 180 for a diagnostics? Battery died over the winter took it out after putting it back in, screen would ask for a 4 number code it took the radio code I think and than I have the nav code which is 5 digits I'm pretty sure, radio nav while deck doesn't turn on except to show DVD disc reading error please consult dealer. Somebody give me something I need music in my car.