Dashboard-to-controller-cable-pinout

There is a cable going from the dashboard to the controller. 
Four wires arrive at the Dashboard. 
From the controller up towards the handlebar actually six wires departure in total. Two of them are for the headlights and det spliced off before arriving to the dashboard. 

Silkscreen label on dashboard           Function          Color         Behaviour
TX                                      Serial data       white         
-                                       GND               black
+                                       12V               red           Only 12V when scooter on.
Key                                     Startup           yellow        When scooter is off, Battery volate. Gets pulled to GND by pushbutton.
                                                                        When scooter is on, 3.3v