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Check your ecm fuse, or your main power relay fuses, basically just check all the fuses under the dash and under the hood, if there are a few relays under the hood, you can try and swap the ac relay with the power relay as long as they have the same numbers on them. If all the fuses are good, it is most likely a relay, or the ignition switch itself
Check for the power supply ,in the back of the radio is two plugs ,one for the speakers and one with the power ,you should have two feeds one permanant 12v and one 12v through the ignition switch .then also check the earth as well or ground if your american
the fan motor is maybe bad, disconnect it (the motor) and put in new fuse, if its ok, then the motor is bad. the resistor only handles speeds lower than HIGH. so replace the motor first, then try it, if all speeds work, then the resistor is OK.
check the wire terminals from the fan motor, its possible that they are loose. Also check the relays if they are good. Just swap out the other relays to test if it will work. These relays can be found in the fuse box under the dash or under the hood.
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