Hi,
I checked the siren earlier. It's an aftermarket siren and it works as it should. Earlier I both had the original and the aftermarket siren. I disconnected the original because not functional and it took 20 milliamps from the battery. I too had a lot of dirt in the windsheild crowl. It's clean now and rust protected.

I must be a liittle bit cleare about my problem. It's only when I close the door and by remote lock the car the siren sometimes turns on, it doesn't lock the doors either in that case. It's like a door was open. It never turn on the siren if I suceeded to lock the car.

Next time I'm in the garage I will discoonect the cables to the hood switch and the tailgate switch and do a test if the siren goes on.

Thanks a lot for your answer !

Lars