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96 740iL - Issues with a/c blower (already replaced resistor)

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So we tested the blower motor with a battery and the blower works fine. We replaced the resistor and reinstalled it into the car and the blower spins but never really changes speed, its stuck in a very low spin. Could there be something with the battery not be activated? I've been reading about other peoples issues and it sounds like one guy went into the dealer and activated his battery. Any other ideas for what the problem might be?