I took a new look at the car's anti theft system. I measured all wires to the Central locking pump and found something. The switch in the tailgate behave strange.

Photos and what I found here for you who want a closer look, page 7 and 8:

Chrysler Crossfire: Anti theft alarm

Note: there is wrong in the Chrysler schematics, they call the hood sensor for door sensor.

Next time in the garage I take apart the locking mechanism in the hatch. I have done that a couple of times earlier.

Thanks for all help !

Lars