There are a number of prerequisites that have to be met before the Webasto ThermoTop Z will run, e.g. it won't run if the outside temp is too warm.
INPA can run basic Webasto ThermoTop Z tests but if you don't have access to that, then a simple way to test the operation is put a jumper between pin 1 on X642 (RT/GE - Red/Yellow) to pin 1 on X764 (WS/GN - White/Green) - this should start and run the Webasto. If it does, let it run for a few minutes before removing the jumper. (see attached image).
This thread might also help - it outlines the process of adding a remote start to the Webasto ThermoTop Z and includes some circuit information.
https://xoutpost.com/bmw-sav-forums/...start-kit.html
A more complete discussion of the Webasto ThermoTop Z in our cars can be found here: -
https://xseries-forum.com/forum/view...a9c68427d4535a
Good luck.
