Since the error is specific to electrical fault (short high) first try to rule out wiring including disconnect connector If the internal sensor/heater shorted out giving the error the problem will migrate.

Example: you are getting a shorted high signal that should happen if the wiring has an insulation break and is shorted across two wires (hot and signal). If you unplug and still have the same error the short is in the wiring.

If you unplug the tstat and the error becomes "open signal to tstat" well the. You have your answer: short internal.

You can probably find online what Ω values the connector to the tstat should read. I don't even know how many wires it has or if it's a temp sensor or heater or both. I thought it was both .

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)