Hi,
Now after one year I took the wiper cover panel off and looked what's inside. And yes my old broken alarm siren is still there and it's connected too. I disconnected and remowed it. I haven't mesaured the current yet. Normally my car's standby current is about 0.27 Amp.

This is how I removed the cover panel and the siren alarm:

Chrysler Crossfire: Battery Replacement

/Lars