I have a problem with the alarm on my w203
when I close it from the alarm of the key (closed lock) the car starts to sound and lights are activated as if he were stealing ha ha!
malfunctioning alarm. when I open it from the alarm of the key (open lock) or if I start the alarm goes off. any of you happened this problem?

 

I have this problem, but also of the siren, I have also the problem of flasher lights.
http://www.benzworld.org/forums/w220...-off-when.html
http://www.benzworld.org/forums/w220...ease-help.html

watch this!
http://www.benzworld.org/forums/w220...ml#post3667044
I do not want to have that problem if I replace the siren.

 

I'm going to list the faults with the car alarm has:
1: I close with the fob, when I open it with the fob position lights and the headlights are lit auxiliary only go off if I open the driver's door.
2: I am in the car, I close with the fob, I move in the car, turn on the radio and the alarm does not sound, no lights flash.
3: open the window, I close from the fob, stick my head inside, no alarm, no lights
4: I close from the fob, open the driver's door with the key of relief (metal) and alarm lights begin to flash. but no siren.

 

I forgot. when I close the light is flashing red button trailer.

 

fine, remove the bell, I have in my hand.
even without the siren, continue on and off the flashing lights. Position continue latching on the lights. did not change anything. no way to measure the siren with the multimeter?

 

The siren is only a noise maker. Connect 12 v (mind the polarity) and it will scream or not.

The smarts for the alarm live in the front SAM. Output devices are doors locks and windows, parking lamps, fog lights, siren. Inputs are from immobilizer, tow switch, driver door Ir window. Some cars have an interior motion sensor.

The only common failure part is the siren itself. It is only the part that makes noise. Any of the other parts can contribute to unintended operation.