DIY: BMW E46 M3 Rear Window Switch Repair & Modification
If you have an intermittent window switch and need to replace it, this is a simple DIY on doing so. Also, if you want to modify your existing switch to allow one touch close for the rear vent windows (instead of having to hold the switch up while it closes), then I'll show you that too. The switch modification is the second of two steps needed to enable this (the first is programming).