It was the switch on both our Mystiques when the blower failed, although you will usually still have highest speed with that switch failure. The low resistance is normal. Does the motor work of you run it directly from the battery? You could also check if 12 volts is present at the blower motor connector if you can get to it. Some voltage should be there at each speed setting. I am fairly sure 12 volts at each speed if the blower motor is not connected. The voltages will make sense (low volts+low speed) if the motor is connected and running.
