moin moin … me annoyed it a little bit that I can not operate my 4 window lifters all on one impact … that’s why the idea came to me to install an additional switch … maybe someone has already done it and can help me … as a slipper stand available 1 original astra f efh switch individually from the passenger side or a universal efh switch from sonem ebay retrofit package … my question now …. to which cable must I close the switch, evt l of the 4 individual switches to close any cable collection ? can I connect the additional switch to the comfort function with ß has here someone a schematic of the original efh ? for your help and tips I am already very grateful in advance