Find the plug that powers the heated seat. Using a meter, determine if the heating coil in the seat still has "continuity", meaning, does electricity still conduct through the heating coils. Find a meter to check this. There may be a thermostat in the seat that keeps the seat from getting too hot, so you might want to find it and verify that it works. If the heating coil is not broken (you still have continuity) and the thermostat is working, check back to the switch, connectors and fuse. Take it a step at a time and you should be able to figure out what is wrong.
Check www.autozone.com, they have a Repair Info section that covers Buick LeSabre with this info.
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To repair a seat heater on a 2004 Buick LeSabre, disconnect the connector and check for voltage. If there is no voltage, replace the switch. If there is voltage, check for an open circuit.
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Easy. There is no Buick LeSabre "Deluxe".
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