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Check to make sure the power supply wire from the battery cable is connected and not broken, the PCM has no control over any of the interior features, that is all controlled by the GEM.
There really are only two ways, one is to scan it with a scan tool and th eother is to replace it with a new one or known good part.
That would be my first step in diagnosing.
most shop will charge a flat fee of one hour for a scan test, so what ever the door rate is. You should be able to find a wiring diagram by searching online, if not let me know and I will see what I can find for you.