It may not exactly answer your question, but on these German cars there is standard terminology for certain circuits. Terminal 31 refers to ground, Terminal 30 is +12V hot at all times, terminal 15 is switched +12V, etc... *So, you are looking for continuity to ground I expect.
https://en.wikipedia.org/wiki/DIN_72552
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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