Use compressed air or a heat gun and blow out all the connectors. I had a shop install a sun strip on my windshield yesterday and my rearview mirror connector was full of water when they finished and it shorted out my back-up display and homelink. Fortunatly I was able to dry it out with a heat gun and it works properly again. Won't be using that shop again either. Water and electronics never play well together.
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BMW Z4
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