It is very frustrating to get in your car on a cold winter's morning, turn on the heater and hear no blower. Or turn on the air conditioner on a 90-degree day and hear no fan. There are several possible causes for a non-functioning blower motor; it takes some detective work to determine which possible cause is the culprit. A failed blower motor control module is one possible source of a non-operating blower motor. The steps to determine if the module is the problem are fairly simple.
Locate the fuse box which contains the blower motor fuse and check this fuse. If the fuse is bad such as having a broken filament or corroded connecting points, replace it and try the heater/air conditioner again. If the fuse is OK, go to Step 2.
Turn on the ignition switch and turn the air conditioner control to maximum cool. Using the voltmeter probe, test the voltage on the wire going into the blower motor control module. If the voltage is "0" or very low, the problem is occuring before the module. If the voltage is satisfactory, about 12V, go to Step 3.
Using the voltmeter probe, test the voltage at the connectors to the blower motor. If the voltage is "0" or very low, the blower motor control module may be bad. If the voltage is satisfactory at the blower motor connectors, about 12V, the module is OK but the blower motor may be bad.
