Ac blower motor wiring diagram for chevy trailblazer

To test the blower motor resistor, unplug the resistor connector. Each blower motor switch input terminal on the resistor must have continuity to the resistor output terminal, which is connected to the circuit going to the blower motor. If the blower motor resistor continuity does not check OK, replace the faulty resistor.You need a multimeter to test the resistor block and there should be continuity between all terminals.
But if blower motor resistor is replaced, then blower motor switch and relay needs to be tested.If relay is checked ok and switch is tested ok, then the wiring's needs to be inspected.
See wiring diagram below :---
I have given this diagram twice.



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