Irresistance
Senior Member
- Joined
- Apr 25, 2009
- Messages
- 786
- Reaction score
- 6
- Location
- Gdansk, Poland
- Your Mercedes
- 2004 W220 320CDI
Okay... well - I have had this issue since I owned the car but I am slowly starting to have enough of it...
The car will sometimes (more often than not) require me to lock it twice - after the first lock signal it will close, but the orange lights will blink like the alarm went off. No sound.
However. Just a month ago, by accident, while my mechanic had it on STAR, I noticed a "F" with the alarm system. Turns out the movement sensor on the roof was faulty. After a brief inspection, it became apparent the damn thing was not actually attached to the wiring... I re-attached it, and it seems to work. When I move around in the car when the alarm is engaged, the lights start to flash. But there is no alarm sound, like the horn is not attached or working.
Now - the previous owner had some other/second alarm system in the car, this has been removed over a year ago. The double-close/lights flashing problem was present before and after removal.
What is causing this? I suspect that if the alarm siren was working, the car would in fact be making noise in those instances where I need to close it twice...? Why is it doing this? What is it trying to tell me? I read somewhere here that the batteries on the alarm unit fade and thus cause problems...? But when I go look for anything alarm-related online I can only see three parts: Alarm control unit, the siren, and the roof sensor. No mention of any battery pack. Is this inside the control unit?
Many thanks
The car will sometimes (more often than not) require me to lock it twice - after the first lock signal it will close, but the orange lights will blink like the alarm went off. No sound.
However. Just a month ago, by accident, while my mechanic had it on STAR, I noticed a "F" with the alarm system. Turns out the movement sensor on the roof was faulty. After a brief inspection, it became apparent the damn thing was not actually attached to the wiring... I re-attached it, and it seems to work. When I move around in the car when the alarm is engaged, the lights start to flash. But there is no alarm sound, like the horn is not attached or working.
Now - the previous owner had some other/second alarm system in the car, this has been removed over a year ago. The double-close/lights flashing problem was present before and after removal.
What is causing this? I suspect that if the alarm siren was working, the car would in fact be making noise in those instances where I need to close it twice...? Why is it doing this? What is it trying to tell me? I read somewhere here that the batteries on the alarm unit fade and thus cause problems...? But when I go look for anything alarm-related online I can only see three parts: Alarm control unit, the siren, and the roof sensor. No mention of any battery pack. Is this inside the control unit?
Many thanks