Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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PCM needs to be programmed to vehicle at dealer for it to work. What engine do you have? I'll tell you how to test wiring to make sure PCM is problem.
If you ground the dark green wire at pin 42 of connector 1 at PCM this should turn on low speed fans. If you ground the dark blue wire at pin 33 of connector 2 this will turn on high speed. If both work when grounding wires you know PCM is the issue. Dealer will charge around $100 to install and program. Let me know if you have more questions, thanks.
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No problem, let me know how it turns out. Thanks again and have a good evening.