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Welcome to Just Answer My name is***** here to help you with your problem. Usually this is the rear blower transistor lets start by testing it first. Here is the test.
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When you performed the test did the blower motor run?
Ok,Here are the self tests for the system lets see if we can get some info to start testing the inputs.
Check power and ground to the rear climate unit and this connector ,if they are good and no wiring has been added before the problem started then looks like the rear unit is bad.
here it is again
in the back of the control unit