WHAT DO I REPLACE WHEN MY REMOTE WILL NO LONGER OPEN MY TRUNK?

Thanks for your answer however the remote works fine everywhere else and I do not know of any main switch on a 2003 Sonata.

Do you have an owners manual?

Yes I do and I looked in and found the answer to my problem a little switch that says locked and unlocked. Thank you so very much my friend. I am sure if I had gone to a dealer with this problem it would have cost 2 maybe 3 Cs. Thanks to you it cost me nothing but a little time. Thank you again. Everyone take notice ziptie12 is a genius.