My key fob was working fine with my door locks. Then, one day, I had it in my hand while holding a book in the same hand. Unbeknownst to me, I had some of it's buttons depressed against the book for a period of time, perhaps just under a minute. Ever since then, the fob will only open and close the front door locks and tailgate. It no longer works for the back doors. Programming instructions in the manual don't help at all. Dealerships want way to much money, just to look at it, and I am at wit's end. Any ideas?