I have a E34 525 iA 93 and the power window system is not
working very well. So, when I command the driver's window to go up, at
the same time the right rear window goes down and the soon roof starts
opening.
       Another problem is that the A/C blower on my car only works on
the 4th setting. So, I changed the blower ballast resitor and now I
have the same fan speed for position 1, 2 e 3. The 4th setting works
like before, normally.
       Let me know the answer to fix it.
       Best Regards

       Dalla Vecchia