To program a keyless entry remote for a 2005 Hyundai Elantra, first, sit in the driver's seat and close all doors. Insert the key into the ignition and turn it to the "On" position without starting the engine, then back to "Off" five times within 10 seconds. On the sixth turn, leave it in the "On" position; the door locks should cycle to indicate programming mode. Press any button on the remote you wish to program, and the locks will cycle again to confirm successful programming. Repeat this step for any additional remotes, then turn the ignition to "Off" to exit programming mode.
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...
Keyless entry remotes must be programmed by a Hyundai dealer.
There should a programming guide in the users manual
The Hyundai Elantra is a very basic entry-level car, and thusly does not have many features. Leather is not an available option on the Elantra.
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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.
To program the 2004 Concorde spare keyless entry, you can take the vehicle to the dealer or you can download the manual. In the manual, there are steps to reset the keyless entry using your vehicle's VIN and other identifications.