Hi mate, not sure if its of any help but my TOD ‘AUTO’ light flashes like that when going from 2wd to auto and auto to 4wd (an back), it flashes whilst the selection is made and then the ‘AUTO’lights permanently to let you know the selection has been successful. Is 4wd and 2wd working? If it is, it could be a sensor isn’t telling the TOD brain the transfer box has reached the selected setting?