5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
I've replaced the electric motor and regulator in the back passenger side door as the old one had stripped out some gears. The new (second hand), one drops and lifts the window fine but I'm concerned about the stop limits for the window. I checked the limits switch, which works off the regulator quadrant, before I put everything back together and it appears to open/close the circuit when I check it with my volt/ohm meter. However when I manually operated the limits switch, while operating the window power switch, it didn't stop the window from moving. I'm therefore reluctant to shut the window using the door lock method and I only use the electric switch whilst being very careful of stopping when it reaches closed or fully open. I thought the limit switch would cut the power to the window motor once it went open circuit so perhaps the wiring has been changed. Can anyone tell me how this wiring is supposed to work?
Thanks for that Mitch, I hadn't considered the switch only being in use during key locking to lift the windows. I'll try this during the next week.
If this switch is only in use whilst key locking to lift the windows, does the electric motor have an over current shut off that stops it at the full extent of its travel i.e. fully open and fully closed? My concern is what stops the window at its limits and how can this be tested without risking damaging the motor or gearing?
I only bought the car recently and the window winder wasn't fuctioning when I bought it. The power had been disconnected to the motor and the window wedged in place. I don't know whether the cause of the damaged gearing was the motor not shutting off when the window got to its limits and I'm unsure how this fuction works.
The original window winder motor was still functioning prior to me swapping it out. It was the regulator gearing that was at fault. The window could be wound up or down only with manual assistance, as the motor would run but the gearing would slip.
Looking at your thread I think it's more than likely that I could have fixed my unit as you have done. At any rate the replacement regulator and motor only cost me $45, so I'll keep the old one as a spare.
Thanks for your suggestion and the helpful link to your photos.
I have 520 1995 model at Japan.My 520 have same problems as you.Did you replaced Limit micro SW?And How's working?My car also did not to stop windows by limit SW.Ohrm meter checked but still on circuit doing SW push and released.May I tell me your option?
I never established the exact way that the window switch works. They,ve been going up and down and stopping without burning out the motors or stripping the gears for many months now - just sounds like the motor loads up when the windows shut and I won't stick my hand in to check.
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