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Electronic locks

My 2002 Sonata has stopped unlocking with either the remote or the switch on the door. Locks just fine. Brought this up before, someone suggested a new battery in remote. Tried, no go. I think it’s in the switch, but how to get at it? Should I let a willing friend take the door apart?

It sounds like one of the relays in the module that handles the locks has failed. The module will need to be replaced.

Is that expensive? Can my friend handle it do you think? (Handy, but not really conversant with car “stuff”) Also have a neighborhood mechanic…would that be a better option? And thanks for the reply!