21:st-Mar-2018, 18:21:16
I thing the module in courtesy light is manipulated by LIN bus (if have green thin cable). Then Ambient light LED will be switched ON/OFF via LIN bus.All Other bulb too. Many modules in this car like in my Insignia are controlled via LIN bus because this will eliminate many cables. One IC for LIN bus is around 1$ max. Check for green thin cable on lamp module. Original camera, Rain sensor, Light sensor all of them are read over LIN bus.
Regards
Regards