old climate control unit does not indicate when driving light

Hi, guys!

I built my baby back together today. Had him apart because I implanted e-seats and music. Seats work with memory and heating. Supppppiiiiii!!!!!!!

Now I have the problem with the climate control panel: when I turn on the driving light the display goes off, but the device works perfectly. Lights off and then the display is there.
Has anyone had any experience? Or maybe I messed up on the voltage tap for the phone after all. There I am at the 3-pin plug of the climate (mass and ignition plus).

Greetings from the Westerwald!

Martin

PS.: The installation of the center console is quite simple-even without dismantling the dashboard. If only the ventilation channel had to be used for later later, then it would work!