Go to a dealership. If you bought the keypad from someone other than the dealership, they'll charge a fee to do it. However, if you buy a keyless entry keypad from the dealership, then they'll do it for free. This is one way I know of that I used.
its a CR 2032
use your key and reprogram your remote from the dealership
Keyless entry remotes must be programmed by a Hyundai dealer.
I found an Internet site which says how to program the keyless entry remote. But there is an error: this procedure is good for Elantra 2001 to 2003. Elantra 2004 must be programmed by the dealer. http://car.justanswer.com/hyundai/n1kw-program-remote-entry-hyundai-2004
Dealer or Locksmith! Must use scantool...
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