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I looked at info for a Silverado 1500. Use a test light to check for voltage at horn fuse in under hood fuse box. According to this diagram, the horn relay has to be energized. Have a helper hit the horn switch when you check voltage at horn fuse. If hot, have to check wiring circuit to horn. In the diagram, dark green wire is voltage and black wire is ground. You could actually use jumper wires from battery for voltage and ground to horn, for testing.
It depends if it is a classic or new style Silverado. Both were made in 2007. If it is a classic Silveradothere is a replaceable relay in the under hood fuse block. If it is a new style Silverado the horn relay is part of the printed circuit board that is only available with UBEC (under hood bussed electrical center).
Check wires leading to horn, test for power & ground. If that's fine, test horn (from alternate power source) to see if it's broken. Generally it's going to be a problem with the wires to the physical horn under the hood, or the horn itself.
Most likely the blower motor resistor. It's mounted next to the blower motor under the dash. Also check the 7 wire plug going to it, GM had a problem with that plug, and the wiring getting hot and melting. The plug is $68.00 from the dealership. One of my customer's car had the same problem.
Follow the wire harness down to the junction box were the wire harness plugs into under the truck adn ck for corrosion especialy if you live in a snowy area corrosion due to road salt.
If the other door works then the fuse is good.Before replacing the motor try twisting on the harness that goes from the door a disappears into the inner fender,wires in this harness get broken off from the tears of twisting when the door is opened and shut.
fuel filter? how about power to the fuel pump,loose ground wire to chasis? wiring harness? terminals clean at point of connection?did you check the fuel pump relay? Relay is located in electrical center under the hood on the driver side.relay and fuse legend will be on bottom side of cover, you sould be able to switch with another relay that you know works, ie: switch horn relay with fuel pump relay, honk horn to insure both relays are working when either relay is inserted into horn slot. Do you by chance have the electrical schematic drawing for the fuel pump?
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