GM Repair Questions? Ask a Mechanic for Answers ASAP
Hello I will help you with your question,
There is no direct test without setting up power, ground, the control voltage and th load on the module. Much easier to test in the car with a voltmeter and make sure the module has everything it needs to operate. If it does and it will not run the motor after the motor is tested then the module needs to be replaced.
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I did try to test in the car I got around 8v on batt when not working around 13 when working (no control) and I was getting less than a volt on input when working or not it was the same. Probably the module is the problem? I had a friend guessing at the BCM even though the rear blower is working at all times with controls
If you only get 8 volts on the supply then you have a problem with the supply. It is NOT the BCM, please let me know how I can help by posting your readings at each wire color you tested with the blower speed set on high, everything connected and the key on. Use a straight pin to probe along the wire into the connector to read the voltage.
To the module on red (batt) i get 8v when not working and 13 when working. On blue (input) i get less than a volt working or not). To the blower motor (purple and black) i get around 10v at all times working or not
I don't understand what you mean when you are saying it in not or is working? Does the blower motor run? Can you control the speed if it does?
Let me know why you are testing the module.
It works at times but i have no control as to when it comes on. When it does come on i can control speeds but if I turn it off it will still run even with the car off
What is "IT"? The blower motor?
If the motor is running with the car off replace the module.
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Yes ``it`` is the blower motor and it does run at times with the car off. So it would be the module then. Thanks for your help.
Yes, the module will not run the motor with no control voltage unless it is shorting inside. Replacing the module should fix the problem. Be sure to look for any melted or burnt connections, if you find them they have to be repaired.
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