How would I know module 77 is dead? Apologise I'm new to this so some of it might need dumped down for me. No the last time battery was disconnected was sbout this time last year for putting a battery cover on. I'll need to check the battery then. Yes I noticed that as well. I don't know how that is that there 30000km out. How would you go about finding wiring issues? All my sat nav and radio work fine, do don't know why they would come up with a fault.