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Depends on what radio option you have in the car. Best bet is to spend a few bucks and sign up with alldatadiy.com which should have the wiring diagrams for your deville.
If it has the same radio as an Esclade you can find the diagram on the justanswer.com website. Or post a question if you have a different Radio. http://justanswer.com/
You can register on autozone's website and get access to basic repair info including wiring diagrams. The problem is going to be the wiring diagrams are filed under the component not the area of the car. So the fuel pump wiring is listed under fuel or engine management, the lights are under lights, and so on.
Devilles use a controller instead of a basic blower resistor. Someone would need to check the blower motor for power and ground, then check the controller mounted in the HVAC box on the firewall. You may need a shop manual to get the wiring diagrams needed to troubleshoot the system.
go to autozone.com. register and enter your car. there are free repair guides available along with wiring diagrams. you might have to search under chassis electrical for wiring diagrams or they could be listed separately
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