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Old 05-31-2016, 01:08 PM   #1
e46_royalty
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Alarm malfunction

My alarm keeps going off randomly with no one around my car. Sometimes it goes off till i unlock the vehicle or sometimes it just shuts off by itself. I have checked all the fuses and they are fine. Anyone else experiencing this problem or could point me to the right direction
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Old 05-31-2016, 01:10 PM   #2
Silverdogz
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Check the battery voltage, it could be fluctuating enough to trigger the alarm.
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Old 05-31-2016, 01:12 PM   #3
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Could be hood sensor
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Old 05-31-2016, 01:14 PM   #4
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Pull the codes using PA soft or something similar, I believe it tells you what triggered the alarm.
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Old 05-31-2016, 08:01 PM   #5
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Originally Posted by orb View Post
Pull the codes using PA soft or something similar, I believe it tells you what triggered the alarm.
Yes it does!

OP, as other member said, most common failure in the alarm system is the hood sensor.
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Old 05-31-2016, 09:01 PM   #6
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Off topic, but related: why do we say "alarm going off", when it's actually on?
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Old 06-06-2016, 07:34 AM   #7
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Off topic, but related: why do we say "alarm going off", when it's actually on?
Idk. People say "I got it off the internet" and a few other things I just can't remember at the moment
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Old 11-27-2016, 04:38 PM   #8
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I have the same issue, anyone discover the culprit, although each situation may be different but......?
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Old 11-28-2016, 01:25 AM   #9
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Hey guys - So I'm in the same boat as y'all. Start with unplugging your hood sensor and wait to see if it sets the car alarm off again. If the car alarm goes off again, plug it back in and go in to the car and access the on board computer (OBC). To do this read up here for info on how to use the OBC, it's a handy piece of kit! Select option 9. The car should read something like *0000128* 128 means theres 12.8v with out the car running. My car was reading 12.1, Even though I had JUST replaced the battery. Upon starting the car it Reads 131, but you, you super sleuth, know that means 13.1v. What your car should be reading is 14.1v -/+, Thus concluding your alternator might be on its way out. Before freaking out thinking you need to buy a new alternator, CHECK THE BELT. When they wear out they tend to slip and stretch giving less than optimal tension on the alternator pulley. If a new belt doesn't solve your problem, check your ground connections and if all else fails, it's time for a new alternator! Which in my case is what I have to unfortunately replace...^&(%^...

IN THE MEAN TIME,

hit the lock button on your car twice to disable the car alarm until you can find a solution.

Hope this helps!
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Old 11-28-2016, 09:07 AM   #10
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Start simple: check battery health.

If the battery is OK, replace the hood sensor. It is a common failure item. A new one costs $10 and takes about 1 minute to replace.
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Old 12-02-2016, 01:26 PM   #11
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UPDATE: apparently theres a thing called a Voltage regulator known to fail.. It sits on the the back of the alternator and occasionally fails, its a $53 part so if belts don't correct your issue then try replacing the voltage regulator.. If that doesn't help perhaps its best to go the route of a new alternator

O.P. - Have you discovered anything yet?
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Old 12-02-2016, 01:38 PM   #12
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Originally Posted by KnockKnockVanos View Post
UPDATE: apparently theres a thing called a Voltage regulator known to fail.. It sits on the the back of the alternator and occasionally fails, its a $53 part so if belts don't correct your issue then try replacing the voltage regulator.. If that doesn't help perhaps its best to go the route of a new alternator

O.P. - Have you discovered anything yet?
+1 on the Voltage Regulator, if that doesn't work pick up a reman. unit from your local NAPA/Autozone.
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Old 04-28-2017, 07:17 AM   #13
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Originally Posted by LeMansteve View Post
Start simple: check battery health.

If the battery is OK, replace the hood sensor. It is a common failure item. A new one costs $10 and takes about 1 minute to replace.
Would LOVE to know where to buy one of these babies for TEN BUCKS~

???
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Old 04-28-2017, 09:27 AM   #14
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Would LOVE to know where to buy one of these babies for TEN BUCKS~



???


Amazon/EBay?


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Old 04-28-2017, 09:47 AM   #15
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^ Or free at the scrapyard.

I probably have a handful of these, just like I do for the gas door spring.
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Old 04-28-2017, 09:47 AM   #16
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Originally Posted by KnockKnockVanos View Post
Amazon/EBay?
BMW part number is 61319119052. Used ones on ebay are around $20 and new ones are around $45.
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Old 04-28-2017, 10:27 AM   #17
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Alarm malfunction

Quote:
Originally Posted by orb View Post
Pull the codes using PA soft or something similar, I believe it tells you what triggered the alarm.

It's better to read the codes with INPA or other BMW tool. PA Soft does not give the number of occurrences of the alarm trip and you can't tell the difference between the interior sensor tripping the alarm once and the driver door tripping the alarm 31+ times. Max number of occurrences that the general module records is 31.
In INPA select E46 -> Body -> Central body electronics ZKE5
F4 (Error) -> F3 (Shadow)
This page shows the shadow codes where the alarm trip codes are stored with the number of occurrences.


It's not going to be a fluctuation in the battery voltage. It is not going to be the voltage regulator, which only regulates the voltage coming out of the alternator when the engine is running. It does nothing when the engine is off and the alarm is armed.

You can go ahead and throw parts at the problem and hope it's right, but, I suggest finding the root cause of the problem and fixing the actual problem and not what you think the problem is.
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Old 04-28-2017, 10:35 AM   #18
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Originally Posted by Uncle Scotty View Post
Would LOVE to know where to buy one of these babies for TEN BUCKS~

???
Blame my outdated memory. When I replaced mine 5 years ago it was about $10 for a Genuine BMW part. The price seems to have jumped quite a bit since then.
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Old 04-28-2017, 10:47 AM   #19
KnockKnockVanos
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Originally Posted by scottjoh View Post
.
--
It's not going to be a fluctuation in the battery voltage. It is not going to be the voltage regulator, which only regulates the voltage coming out of the alternator when the engine is running. It does nothing when the engine is off and the alarm is armed.

Mine went off due to my battery. (poor contact to the terminals)



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Old 04-28-2017, 01:35 PM   #20
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Mine went off due to my battery. (poor contact to the terminals)

Poor contact like that should have given you starting and other electrical problems! The alarm trip would have been the least of your problems.
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