One ground can control many devices; they don't all have their own seperate grounds; they share them.

According to the electrical diagram I have, the power windows (convenience control module relay), window heaters, blower motor, etc... all share the same ground, designated "W1" and located behind the instrument cluster.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.