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Discussion Starter #1
Firstly, I have searched, and am still searching, many different websites.

I know that I have an alarm, it used to work. My car would also beep when it was activated using the remote, along with the flashing of the cornering lights.

But recently, I was out shopping the alarm was set off, when I returned the cornering lights were flashing but there was no sound. Now, it no longer beeps when activating the alarm, nor is there any sound of the siren when I test the alarm.

1. Is the audible sound "beep" and "siren" on a separate fuse then the lights and locks for the alarm? Which fuse and where?

How can I troubleshoot the system?

**One side note. The other day, the alarm beeped using the remote when I returned to my car. It was very cold and I had been driving on poor mountain roads before the rare occurrence.

There are so many different threads regarding this topic, although every time the topic is revisited, the subject is changed during the course of the thread. I would like to hear from others that have the same set of circumstances. I know there are others.

Yes I like the alarm. No I wouldn't like to disable it. Thanks though.
 

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Discussion Starter #2
bump
 

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check the hood sensor. Open the hood. It is toward the back left near that empty compartment. Looks like a push switch. Hold it down with ur finger and lock the car, if it beeps, then that was the problem (it was not closing all the way, the car thought the hood was still open, and didnt arm the alarm). I fixed mine by putting a bunch of layers of tape on top of it so when the hood closes on it it goes down all the way. Hope that helps...
 

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Discussion Starter #4
Thanks I will try that tonight... that leads me to want to check the rest of the sensors, can anyone tell me some of the less obvious ones? Thanks again for the input daniel.
 

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this has happened to me many times. the trunk was unlatched, the passenger door wasnt shut all the way... etc.
 

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Discussion Starter #6 (Edited)
ok I checked it out, surprisingly the sensor wasn't working. I tried the alarm (as I walked to the car) with the hood closed, doors shut, etc.... No lights flashed, like they used to. I opened the hood and played with the sensor and I got the lights back, but still no sound.

Tell me something, where does the "beep" come from? Does the beep sound when locking/unlocking the car come from the "alarm's siren" or somewhere else? Additionally, I held down the trunk button on the key and activated the alarm, all lights flashed but no sound? :banghead:

I don't know where the siren is located in my car?

Is the siren on a separate fuse then the rest of the alarm system?

Any help would be greatly appreciated!! :loco:

Thanks
 

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Discussion Starter #7
Sig Check.
 

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Discussion Starter #8
OK, so tonight I discovered something rather intriguing. I noticed that my siren is actually making some sound, albeit extremely weak (hardly noticeable).

I sat in the car and armed the alarm with the key. I got the clown nose and the doors locked, along with the flashing of the cornering and tail lights. That all seemed normal. Except for one thing, the motion sensor.

I tested the motion sensor. No response, it wouldn't trigger the alarm. So I popped of the the motion sensor housing and verified the existence of a sensor. Yes the sensor was there, but it was not triggering the alarm (even dismounted in my hands, hanging from the ceiling).

So I used the unlocking button on the center console and opened the door. Now the alarm was activated. I had blinking flashers, headlights and taillights along with a faint, little squealing noise coming from under the wipers. So I pulled off the panels in the engine bay and located the siren.

This time I used the truck button on the key to active the distress feature. Once again the alarm activated but I only got the faint sound from the siren. This seems totally odd to me.

So I gave the siren unit a hard jolt and still nothing. I tapped it with a hammer and still nothing.

It seems apparent to me that I have a bad siren. But could the low signal from the siren somehow be related to the non-functioning motion sensor in the headliner? UMMMM?

Or could all the problems be related somehow to a central source, such as the alarm brain in the trunk??

This is a very specific question that can most likely only be answered by someone who has had this problem or a BMW mechanic/GURU. So if you are one of these people and you are reading this please help, because this is really starting to twist my head up.

Thanks in advance!
 

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Discussion Starter #9 (Edited)
OK, so tonight I discovered something rather intriguing. I noticed that my siren is actually making some sound, albeit extremely weak (hardly noticeable).

I sat in the car and armed the alarm with the key. I got the clown nose and the doors locked, along with the flashing of the cornering and tail lights. That all seemed normal. Except for one thing, the motion sensor.

I tested the motion sensor. No response, it wouldn't trigger the alarm. So I popped of the the motion sensor housing and verified the existence of a sensor. Yes the sensor was there, but it was not triggering the alarm (even dismounted in my hands, hanging from the ceiling).

So I used the unlocking button on the center console and opened the door. Now the alarm was activated. I had blinking flashers, headlights and taillights along with a faint, little squealing noise coming from under the wipers. So I pulled off the panels in the engine bay and located the siren.

This time I used the truck button on the key to active the distress feature. Once again the alarm activated but I only got the faint sound from the siren. This seems totally odd to me.

So I gave the siren unit a hard jolt and still nothing. I tapped it with a hammer and still nothing.

It seems apparent to me that I have a bad siren. But could the low signal from the siren somehow be related to the non-functioning motion sensor in the headliner? UMMMM?

Or could all the problems be related somehow to a central source, such as the alarm brain in the ECU/DME??

This is a very specific question that can most likely only be answered by someone who has had this problem or a BMW mechanic/GURU. So if you are one of these people and you are reading this please help, because this is really starting to twist my head up.

Thanks in advance!
 

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OK, so tonight I discovered something rather intriguing. I noticed that my siren is actually making some sound, albeit extremely weak (hardly noticeable).

I sat in the car and armed the alarm with the key. I got the clown nose and the doors locked, along with the flashing of the cornering and tail lights. That all seemed normal. Except for one thing, the motion sensor.

I tested the motion sensor. No response, it wouldn't trigger the alarm. So I popped of the the motion sensor housing and verified the existence of a sensor. Yes the sensor was there, but it was not triggering the alarm (even dismounted in my hands, hanging from the ceiling).

So I used the unlocking button on the center console and opened the door. Now the alarm was activated. I had blinking flashers, headlights and taillights along with a faint, little squealing noise coming from under the wipers. So I pulled off the panels in the engine bay and located the siren.

This time I used the truck button on the key to active the distress feature. Once again the alarm activated but I only got the faint sound from the siren. This seems totally odd to me.

So I gave the siren unit a hard jolt and still nothing. I tapped it with a hammer and still nothing.

It seems apparent to me that I have a bad siren. But could the low signal from the siren somehow be related to the non-functioning motion sensor in the headliner? UMMMM?

Or could all the problems be related somehow to a central source, such as the alarm brain in the ECU/DME??

This is a very specific question that can most likely only be answered by someone who has had this problem or a BMW mechanic/GURU. So if you are one of these people and you are reading this please help, because this is really starting to twist my head up.

Thanks in advance!
As far as your motion sensor goes. I dont think it's working,cause you shouldn't be able to arm your alarm from in the car. If i'm in my car and try to arm my alarm,i can't cause of the motion sensor. As far as your siren not working,the same thing happen to me last year. It was cold out and it lasted for about a week. I could get the doors to lock,but that was all. All i know is that it started working again.
 

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Discussion Starter #11
I think both the sensor and the siren have taken a crap on me. The really strange thing about it from a troubleshooting standpoint is that they would both take a crap at nearly the same time, it seem unlikely but I don't have any other explanation since the alarm works when the car is improperly opened as I stated and the siren is just extremely quite.

I called a local parts recycler and found one for 30 bucks, I just need to find a sensor for cheap.

If anyone has any more ideas, please do tell.
 

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I might be wrong, but I think the sensor and the alarm are both connected to the central locking mechanism. Since that's really in charge, I might suspect an issue with that. Are you sure it's the alarm you're hearing and not just a squeaky relay or something?
 

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Sig Check.
Too big!!! :yikes:

OK, so tonight I discovered something rather intriguing. I noticed that my siren is actually making some sound, albeit extremely weak (hardly noticeable).

I sat in the car and armed the alarm with the key. I got the clown nose and the doors locked, along with the flashing of the cornering and tail lights. That all seemed normal. Except for one thing, the motion sensor.

I tested the motion sensor. No response, it wouldn't trigger the alarm. So I popped of the the motion sensor housing and verified the existence of a sensor. Yes the sensor was there, but it was not triggering the alarm (even dismounted in my hands, hanging from the ceiling).

So I used the unlocking button on the center console and opened the door. Now the alarm was activated. I had blinking flashers, headlights and taillights along with a faint, little squealing noise coming from under the wipers. So I pulled off the panels in the engine bay and located the siren.

This time I used the truck button on the key to active the distress feature. Once again the alarm activated but I only got the faint sound from the siren. This seems totally odd to me.

So I gave the siren unit a hard jolt and still nothing. I tapped it with a hammer and still nothing.

It seems apparent to me that I have a bad siren. But could the low signal from the siren somehow be related to the non-functioning motion sensor in the headliner? UMMMM?

Or could all the problems be related somehow to a central source, such as the alarm brain in the trunk??

This is a very specific question that can most likely only be answered by someone who has had this problem or a BMW mechanic/GURU. So if you are one of these people and you are reading this please help, because this is really starting to twist my head up.

Thanks in advance!
You had me intruiged enough thinking you had it figured out... Turns out you're even more confused (which i guess could qualify as "intrigued")...

As far as your motion sensor goes. I dont think it's working,cause you shouldn't be able to arm your alarm from in the car. If i'm in my car and try to arm my alarm,i can't cause of the motion sensor. As far as your siren not working,the same thing happen to me last year. It was cold out and it lasted for about a week. I could get the doors to lock,but that was all. All i know is that it started working again.
Uhm... I don't see a reason why you shouldn't be able to arm the alarm from inside the car. In fact, it shouldn't make a difference whether the signal is coming from inside the car or from the outside. If you sit in the car and arm the system, it will take a few seconds but if your motion detector is working properly, it will set off the alarm if you move...

I'm sorry I can't offer you any help but I will say this: with the OEM alarm, a lot of the features can only be activated/de-activated by the dealer. If you come across a feature that does not work at all, (and before you go nuts changing part after part) it could mean that it was never activated...

I hope that helps any....
 

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Did u ever figure it out? After searching I found the speaker by passenger firewall under hood. Also was a battery. Is it possible that this battery is shot causing the alarm not to function?
 

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The alarm must be coded with all features so it can work as it should. It can be easily done with the pa soft hardware..
 

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Pa soft is a bmw based reader/coder. Search for it
 

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I had the same problem as the OP. Weak siren leading to no siren eventually. I replaced the siren and all is well.


Sent from BimmerApp mobile app
 
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