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Please help me on my 320d that has some malfunction systems centered in that fuses that are red rounded (see photo attached). I made some measurements in each one of that rounded fuses and they only has 5 Volt ! is it normal on BMW diesel engine? or it must have 12Volt like other cars?
You likely have a fuse panel issue. The only place you’ll find 5VDC in your car is in a USB port!
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Finally, all fuses need to had 12V and the problema was a bad electric contact in conector and contacts of the ingnition key. All had been cleanned and now all working well.
You should consider replacing the ignition switch.
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