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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Jan-09-2010, 07:22:18 PM   #1
Daydrea///M
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Default Adjusting Factory Alarm Sensitivity

As much knowledge as I've been able to collect thought these forums, I haven't been able to find any info on how to adjust the sensitivity of the factory alarm system. It is waaay to sensitive and everytime I park it on the street all it takes i a bus or truck to roll by to set it off. I've had neighbors complain and my main worry now is someone messing with my car when it goes off...

Is this something that can be done DIY or am I gonna have to go to the stealer to fix this?

Thanks!
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Old Sat, Jan-09-2010, 08:33:06 PM   #2
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I don't know about adjusting the sensitivity, but if you press the alarm button twice when you arm it instead of once you take out one sensor, but I forgot which one. You can try that first.
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Old Sat, Jan-09-2010, 08:39:12 PM   #3
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I don't know about adjusting the sensitivity, but if you press the alarm button twice when you arm it instead of once you take out one sensor, but I forgot which one. You can try that first.
That would be the interior motion sensor that is disabled with pressing the key fob lock twice. I'm guessing it's the tilt sensor that is causing your false alarms with vibrations. OP you might want to make sure the tilt sensor in the trunk is firmly secured.
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Old Sat, Jan-09-2010, 10:36:09 PM   #4
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I thought when you push the lock button a second time it disables the "tilt" sensor so you can have the vehicle towed while being locked. I didn't think you could disable the interior motion sensor.
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Old Sun, Jan-10-2010, 05:32:18 AM   #5
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subscribed-would like to know this as well.
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Old Sun, Jan-10-2010, 06:43:12 AM   #6
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It has gotten so bad for me that now I lock the car with the key so the alarm doesnt arm... It so sensitive now that its cold out that it goes off all the time.... I would really wanna know how to do this, its just embarrazing, and locking the car by hand just sucks....
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Old Sun, Jan-10-2010, 05:29:06 PM   #7
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Quote:
Originally Posted by Cutlass476 View Post
I thought when you push the lock button a second time it disables the "tilt" sensor so you can have the vehicle towed while being locked. I didn't think you could disable the interior motion sensor.
Sorry you were right too, when pressing the lock button a second time it disables the interior motion sensor (useful if you lock the car with the windows open or a pet/child inside) and the trunk tilt sensor (useful if having the vehicle towed, like you said).
Reference Page 29 of the owner's manual.

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It has gotten so bad for me that now I lock the car with the key so the alarm doesnt arm... It so sensitive now that its cold out that it goes off all the time.... I would really wanna know how to do this, its just embarrazing, and locking the car by hand just sucks....
A common problem with the OEM alarm system is the hood sensor switch malfunctioning or getting stuck. Near the positive battery terminal under the hood there is a pin that is pushed down when the hood is down. If the pin is stuck or broken, while the car is locked the alarm system thinks someone is opening the hood and the alarm goes off. Try disconnecting or fiddling with the hood sensor switch - if that fixes your false alarm problem, the switch is a cheap thing to replace.
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Old Sun, Jan-10-2010, 07:34:24 PM   #8
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Quote:
Originally Posted by roobe16 View Post
Sorry you were right too, when pressing the lock button a second time it disables the interior motion sensor (useful if you lock the car with the windows open or a pet/child inside) and the trunk tilt sensor (useful if having the vehicle towed, like you said).
Reference Page 29 of the owner's manual.



A common problem with the OEM alarm system is the hood sensor switch malfunctioning or getting stuck. Near the positive battery terminal under the hood there is a pin that is pushed down when the hood is down. If the pin is stuck or broken, while the car is locked the alarm system thinks someone is opening the hood and the alarm goes off. Try disconnecting or fiddling with the hood sensor switch - if that fixes your false alarm problem, the switch is a cheap thing to replace.


Thanks man, I'll def check that out... Also, now that I've been reading about the trunk sensor and stuff made me think that maybe putting trunk bike rack on my car might have something to do with it ... It's one one of the best trunk racks and the bike is only 15 lbs... Do u think that that might have something to do with it??? Thanks once again
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Old Sun, Jan-10-2010, 08:14:43 PM   #9
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+1 on "A common problem with the OEM alarm system is the hood sensor switch malfunctioning or getting stuck" I almost had my M lit on fire as the folks living around me had torches and pitchforks as my alarm was going off for no reason... it WAS the hood sensor...
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Old Sun, Jan-10-2010, 11:26:44 PM   #10
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Took a look at my hood sensor switch as well..... Looks to be ok (i unplugged and re-plugged it a few times)

Gently nugged my bumper, no alarm... so far so good.

Problem is I can't bring myself to hit it any harder than a light tap to really test it out...
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Discussing Adjusting Factory Alarm Sensitivity in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)