its a CR 2032
use your key and reprogram your remote from the dealership
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.
Keyless entry remotes must be programmed by a Hyundai dealer.
One reason that your keyless entry may not work is that the battery is dead, take it an auto parts store and have the keyless entry battery replaced. If that does not fix it you will need to take it to the dealer to have the keyless entry reprogrammed.
how do you change the battery in a 2002 jetta keyless entry pad?
CR2032
CR1620
Open the keyless remote and you will see the battery take it out and replace it with the same size.
Not with the keyless entry pad or remotes - unlock your drivers door using your key That's what I had to do on my 1995 Ford Explorer when the battery had a dead cell and there was no power
Rayovac BR2335
IT needs to be done at a dealer with a GDS machine.
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