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post #1 of 83 (permalink) Old 02-19-2016, 02:25 PM Thread Starter
 
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Alarm goes off for no reason - TSB issued by smart

My smart is parked and locked and nobody is doing anything yet in the middle of the night the alarm has gone off... 5 times now. It has happened three nights thus far.

There is no shock sensor on the alarm so as far as I know the alarm will only go off if there is an unauthorized opening.

Has anyone else had this happen? Car is three weeks old tomorrow.

Last edited by FiveSpeed; 02-29-2016 at 12:54 PM.
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post #2 of 83 (permalink) Old 02-19-2016, 02:29 PM
 
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This has been an issue with a few smarts with factory alarms. Seems to happen more on cabriolets. As far as I know a suitable solution has not been discovered. Most people push the tow button on the button bank for the alarm and then lock the car. This should prevent the alarm from going off in the middle of the night.
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post #3 of 83 (permalink) Old 02-19-2016, 02:32 PM
 
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Double check that the service hood is shut securely, and locked. Also double check that both the hatch and glass upper are shut tight. These 3 things can sometimes not close all the way, which may cause the sensors to activate the alarm.

I've had my alarm go off once unexpectedly when I was fiddling with the service hood. As well I've had my hatch not shut properly (appeared shut) but it was ajar enough to not allow me to lock and arm the system.
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post #4 of 83 (permalink) Old 02-19-2016, 04:05 PM Thread Starter
 
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Thank you I'll check that.
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post #5 of 83 (permalink) Old 02-20-2016, 12:34 AM
 
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The alarm was quite often going off at random in my 451. Have yet to even hear it, let alone voluntarily find out what the alarm sounds like, on my 453.
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post #6 of 83 (permalink) Old 02-20-2016, 05:59 AM
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I don't know if this applies at all to a 453, but, FWIW, a number of the 2008 451's, mine included, had a similar problem. In nearly all of the cases it was caused by a faulty interior motion sensor. (That's why pushing the button temporarily "cured" it. The button turns off that sensor.) In my, and most cases, replacing the sensor fixed the problem.
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post #7 of 83 (permalink) Old 02-24-2016, 09:06 AM Thread Starter
 
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So the alarm likes to go off at 12:15AM, 12:30AM, or 1AM. Last night it went off at each of those times. I checked the "hood," doors, and rear hatch before I left the car yesterday and it was all secure.

Each time the alarm went off (and woke me up) nobody was anywhere near the car.

I don't think this car has a shock sensor because I tried rocking it back and forth and nothing happened.

I also parked the car 3 hours earlier than usual so it can't be because it has sat inactive for X amount of time.

Perhaps there is something that "wakes up" at those times?
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post #8 of 83 (permalink) Old 02-24-2016, 10:09 AM
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I had this happen on my 09 Cabrio. It turned out to be a slightly mal-adjusted microswitch on the right side of the tailgate. A tech at the smart center BENT the actuator arm to fix it. When I arrived home 3.5 hours later, the car doors would not lock and stay locked. Just like if you try to lock the doors with the tail gate open. NOT good. The next day I took off the rear tail gate shell to access the BENT actuator and re-formed it to a more natural condition within specs. and have not had a false alarm since. It used to be sensitive to wind gusts when parked and alarm armed, but that was just the microswitch being adjusted on the ragged edge of specs. So check the switch first. It doesn't cost a thing to check out that adjustment yourself.
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post #9 of 83 (permalink) Old 02-24-2016, 11:57 AM Thread Starter
 
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I read your post about that... must be what it is I will concentrate on making sure the tailgate is fully locked. It is just off that every time it has gone off it has been around or after midnight.
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post #10 of 83 (permalink) Old 02-26-2016, 03:19 PM Thread Starter
 
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I'm bringing it in for service on Tuesday.

Looks like 4 hours after I turn off the motor the alarm goes off.

I parked it at 8 the alarm goes off at 12. Parked it at 12 alarm goes off at 4. Tonight I'm going to park it at 10 and see if it goes off at 2.

Needless to say, my neighbors are unhappy and I'm not getting a good night's sleep.

Based on this it couldn't be a micro switch. There has to be something in the smart's brain that switches on 4 hours after it's parked to check something and this is tripping the alarm.
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