If you remove your interior door panel, you will notice a series of gears and arms known as your BMW 318i window regulator. You may think that your power window motor moves your windows, but whether you have power or manual windows, your 318i window regulator is mechanically responsible for raising and lowering your windows. If you have power windows, your window motor acts as the source of motion for the gears of the window regulator, a function that is performed by your turning the hand crank for manual windows.

It goes without saying that if there are problems with your BMW 318i window regulator, you are not going to be able to move your windows. In fact, since the window regulator also serves to lock your windows in place, a faulty regulator may cause your window glass to drop suddenly into the door frame.

In this case it is obvious that the 318i window regulator is at fault, but if your windows are simply stuck you may not know whether it is due to the regulator or the window motor. In most cases, you can tell which it is simply by listening. If you don’t hear anything, then your window motor is not working for some reason, whether it is due to the fuses, the wiring, or the motor itself. However, if you hear a humming or grinding noise, this typically means that your BMW 318i window regulator is stuck.If spraying your regulator with a penetrating lubricant does not allow it to work, then order a replacement 318i window regulator from our online catalogue and restore your windows to working order.