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It is possible that a relay could be bad. Does your car have a Lock switch on the dash? Some years have one.If you are close to a dealer most parts departments have a tester to test the remote.They will do it for free.The turn on theis little box and put the remote on it.Then they push the buttons and the box beeps if there is a signal from the remote.Make sure both buttons work on the remote.
Also if you have the switch on the dash make sure it will lock and unlock from the switch.Make sure the doors are closed when you try.
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