Look under the back seat. Push in on the front of the bottom seat then lift up.
it must be located somewhere at the rear end. check it thoroughly. http://www.buick-lucerne.com/2010-photos-collection/
its under the rear seat. push the rear seat bottom towards back and up to remove and u will see the battery in the car.
It's under the back seat saddle, just pull up on front edge.
Under the back seat just like an oldsmobile aurora.......
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