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Have no idea about the voltages or how to test the syren outside the car. What kind of issue do you have? Anyway I think will be easier to just replace it. When I tried to fix mine by replacing the batteries I've spent money for nothing. Issue started with alarm going off randomly with siren noise....

amer6R wrote: ↑Sat Jan 23, 2021 4:13 pm Do you lock your car via cobra remote or via central locking? It seems that both options activate the alarm?

I lock it with the remote. I have tried the central locking and seems to me that it does the same alarm activation.

Hi all. Sorry for reviving an old thread. Does anyone know what voltage comes to the siren signal wire to activate the alarm? I am getting 0.5v on the signal wire when alarm is in idle state (not triggered) and 0.8v when I trigger the alarm. How can I test the siren when it is removed from the car.

Hi all. Sorry for reviving an old thread. Does anyone know what voltage comes to the siren signal wire to activate the alarm? I am getting 0.5v on the signal wire when alarm is in idle state (not triggered) and 0.8v when I trigger the alarm. How can I test the siren when it is removed from the car.