How do you program a key fob for a 1997 buick regal?

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The key less entry worked until I changed the battery, now it doesn't work. How do I reprogram it?
 
After you have changed the battery in your transmitter, you will need to resynchronize the transmitter. To do this, press the LOCK and UNLOCK buttons on the transmitter together and hold for approximately seven seconds or until three brief horn chirps are heard.
 
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