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My key fob locks the doors but does not activate the horn?

Hi, I have a 2010 Hyundai Elantra. Suddenly over the weekend the key fob only half works. It locks and unlocks the dorrs, but no longer makes any noise. Do I need a new battery?
Thanks!
Lori, March 2012
link Click here to see other fixes for Hyundai 2010 Elantra.