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Try this. Sit in the car. Turn the key from off to on, without starting, until the locks cycle up on and off. Immediately push one of the buttons on the remote , the locks should then cycle. You are done. You will need to turn the key from 5 to 10 times depending on your car.

All of this is spelled out in the owner's manual, which is available as a pdf file on the net, do a search.