The blower motor resistor, or "Final Stage Unit," is a small electronic component that regulates the speed of the heater and air conditioner fan. Typical symptoms of a failed resistor include only being able to use the fan on the "high" setting. Replacement resistors can be obtained from your local BMW dealership and the installation procedure generally takes less than 15 minutes.
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Things you need
Use a screwdriver to remove the one visible screw on the passenger side bolster cover of the centre console. This cover is located below the glove compartment on the side of the console. Slide the bolster cover away from the dash to free it from the hidden clips. Set the cover aside.
Locate the blower resistor by looking into the centre of the dash through the hole beneath the bolster cover. The resistor is the small black box with a cluster of wires plugged into it. Press the clip on the wire connector with your thumb and pull to unplug it from the resistor.
Press down on the plastic tab at the bottom of the resistor and pull the unit out of the dash. Reverse this process to insert the new resistor. Plug the wire connector into the resistor and test the system to make sure it is functioning normally. Replace the bolster cover by pressing it into the console and sliding it forward. Reinstall the screw using a screwdriver.
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