reminds me of a grounding problem I once faced in a Mitsubishi Galant with touch screen A/C controls. The control units ground wire in the wiring plug was quite dirty - and cleaning it out solved it.

cant tell about your 210 though

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)