This information can be found in your owner's manual. If you do not have one, then I suggest you get one. You need an owner's manual to know what items to service and when, and for specifications. You can order one from a dealer, find one at a salvage yard, ebay, or one of these sites: http://www.carownermanual.com/ http://vehicleownersmanual.com/ http://www.vintage-books.com/owncat.htm
It probably is wiring or relay.
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With a jack or a hoist.
Connect the wiring harness to the back of your 1995 Buick LeSabre stereo. Secure the stereo with the stereo retaining screws.
Take it to a Buick Dealership
3387A
On the transmission
Under the hood where it says fuses, its under that cover and the will have down every realy and whats its for (like the fuse bax does).