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Rear window defroster works partly
Need technical help with rear window defroster. I have a X1 E84, where only inner circle works but not outer parts. I have done some troubleshooting, and what I could figure out is that there are 3 source lines and only the inner one has volatage (~7 V), outer ones have 0. On the box connection to the defroster lines there is only one pin with the voltage (~4 V). Is the voltage correct should there be higher voltage? What else can I troubleshoot?
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