SOURCE: How do I program a key fob for a 2009 buick lacrosse cxl
the key fob has to be programed by a dealer for your car or approved and authorized dealer to program the fob to you car and the the memory and code authorization codes to access the card functions.
open fob and see what is broken or worn if its the transmitter buttons replace whole fob if its just rubber inserts order on line for a few dollars same with whole fob online stores ,ebay their only a few bucks
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