Has anyone had a problem with the remote and interior door locks for a 2004 Sonata? I can unlock the doors with the remote but it will not lock them. I have to push the manual locks at each door. I can hear the relay clicking when the remote lock is pushed. [&o]Can anyone solve this puzzle?

 

You don't say what model or year you have, but there have been issues with door harness wiring covered under TSBs. The one I know for sure what 01-03 Elantras. They had an issue with water sealing at the door harness connectors and they corroded which could lead to the symptoms you describe. Even if you're not the original owner, contact a dealer and see if the TSB applies to your car and whether they will fix it for free.