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My 2001 e39 525i has had a problem with the door fob. It hadn’t been working for a while so I cut it open and tested the battery which was ranging 3.14 volts do no problem there. I did find that the battery wasn’t connecting properly to the negative terminal so an easy fix.
However .... now I can unlock the car but when i do it automatically locks it again. If I hold down the unlock button it will do all the right things like wind all the windows down but when I let it go it will lock the car dnd rind all the windows up. The boot unlock works. If I unlock the car with the key it won’t lock using the fob.
Thus one had me stumped. I even removed the door lock switch in case it was shorting but that didn’t change anything. Doors still locked on their own. Any bright ideas out there.
 
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