I have owned an LS430 2006 for about ten years. It has 169,000 miles on it. I just purchased an 03 LS430 with 37,000 miles on it. The navigation on the 2003, for some odd reason, stops the turn by turn directions when you get about a half a mile from the destination. It is a real pain to then search for the road. How can I fix this? And better yet what kind of upgrade will my 2003 navigation take?