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How do I diagnose non-working blower.

(2000 BMW 323i)
in Potwin, KS on October 31, 2013
11/99 production date. It has a transistorized "blower output stage" not resistors. The blower has power but no ground.
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Popular Answer
of Greg's Orange Auto on October 31, 2013
ground maybe comes thru bcm,ck www.alldatadiy.com for info
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