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The first two, the seats and the locks, should be a fuse, but might be a relay.
That fuse may be under the hood, or inside the black plastic fuse and relay box under the hood.
Since the locks and seats take a considerable amount of current, a relay is the more common problem.
Share the year of your car.
its possible that the relay is the problem as most relays have a second power feed wire,if it shorts to the horn side of the relay it can blow the horn.doesn`t happen very often but it does happen.this could explain the horn blowing without the fuse in.you can get a door key made at a lock smith to solve that problem.
We are assuming that you are talking about Fuel Pump Relay; so, take the plastic cover off the Power Distribution Center. There may be a plastic tab retaining the cover, depending on the model LeSabre you have. With the cover removed, stand before the power distribution center so that the square relays within it visually appear horizontal.
Locate the fuel pump relay in the lineup of relays within the power distribution center. If you're looking at the relays from the correct position, you should see two horizontal rows of five. Count from the right over to the third relay in the top row. This is your LeSabre's rear defogger relay; directly below it is the fuel pump relay. Disconnected and connected again to electrical reset it.
Additionally, this video could be helpful,93 Buick Lesabre fuel pump relay location...
Obviously you'll want to check the fuses first as that's the easiest, but i think you may find that the problem is a bad common ground. Pull up the carpet a little near the drivers door opening and you should find a large group of ground wires. That area is a susceptible to water entry and with water comes corrosion. If you find it corroded clean it up as best as possible with a wire brush and reconnect everything and put some dielectric grease on the area.
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