BMW F90: Fault Code - Thermostat Control Line Break

“If you are getting thermostat problems (Map thermostat, control: line break) and you’ve already replaced the thermostat and checked to see if you getting 12v in it, and you are not. Then it’s either bad wiring or your integrated power supply has a blown fuse.. you can technically save the money and solder in a new fuse….

Also, there are a few more things that run off the fuse that was connected to that. All solved now.”