What can be causing my blower motor to not work?

GMB1124

MEMBER
2000 BMW 328
180,000 MILES

I have a 2000 Bmw 328i (e46) and my blower motor isn't working. The head unit is working and I''ve replaced the FSU (blower motor resistor) and the blower motor itself. The fuses are good and there is power to the blower motor plug. I've also direct wired the blower motor and it works just fine. I'm absolutely stumped! Help!

8 Replies

MHPAUTOS

MECHANIC
31,938 POSTS

With the power plugged in to the motor and the car system on, back probe the blower motor plug and check for power and earth, you may have a problem in the plug it self or an earth problem, start here.

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Sunday, July 1st, 2012 AT 5:10 AM

GMB1124

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What do you mean check for earth?

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Sunday, July 1st, 2012 AT 1:55 PM

THIS IS MIKE

MECHANIC
686 POSTS

He was referring to a grounding problem. If the motor doesn't have a solid grounding wire it won't work properly.

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Tuesday, July 3rd, 2012 AT 4:58 PM

MHPAUTOS

MECHANIC
31,938 POSTS

I will find the correct wiring schematic and post you soon, the plug into the motor will have power and earth as mike said, if the earth is faulty this will also cause the motor to fail.

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Wednesday, July 4th, 2012 AT 8:52 AM

MHPAUTOS

MECHANIC
31,938 POSTS

Have a look at the pic, see if thats any assistance, I will see if I can contact a BMW tech for more detailed information, I am having trouble finding exactly what I want in Mitchell 1.

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