[TPBenz]

Neither my 500 or 600 alarm's work. No audible chirps or anything, which is fine with me. They never worked since I bought them.
However, my 600 has just started acting up. It will arbitrarily set the fog lights flashing on and off after I lock the door.
Car has keyless go and it will set the fog lights flashing whether I lock it with the fob or push the button on the handle. it doesn't do it right away. I may lock the door and a half hour later out of the blue the lights will start flashing.

Everything is fine as long as I don't lock the car. The manual is kind of all over the place with locking instructions, but I don't recall reading anywhere that you can lock the car without actually setting the alarm. Is this possible?

Is the audible alarm on a separate circuit than the what the flashing lights are, or are they both controlled with the one "Alarm" fuse?

 

[cdk4219]

The alarm siren module battery has exploded in the sealed alarm and messed up the circuit board. Either unplug it or buy a new one and install it. Leaving it will cause battery drain. There are some that catch the problem soon enough and replace the battery in the sealed unit, but keep in mind it’s not really meant to come apart or have the battery changed, as it’s soldered in.
I believe the sirens are $160 or so, and the battery is $5

 

[TPBenz]

The alarm siren module battery has exploded in the sealed alarm and messed up the circuit board. Either unplug it or buy a new one and install it. Leaving it will cause battery drain. There are some that catch the problem soon enough and replace the battery in the sealed unit, but keep in mind it’s not really meant to come apart or have the battery changed, as it’s soldered in.
I believe the sirens are $160 or so, and the battery is $5

So replacing that siren will cure the arbitrary flashing lights?

 

[MikeJ65]

No, your alarm is being triggered by something. If you have DAS, go to the Driver side SAM and look in actual values to see what has been triggering the alarm. Probably a switch going bad, something like that. If you just want to disable the alarm function, you can do that in adaptations.

 

[cdk4219]

When my e55 was going haywire it was caused by that siren. It would go off randomly and keep going off. If I recall it was the same for the 230 as well. Unplugging it took care of both problems I believe in both cases. If I recall the e55 was doing it after it rained. I believe they are the same sirens.

 

[TPBenz]

No, your alarm is being triggered by something. If you have DAS, go to the Driver side SAM and look in actual values to see what has been triggering the alarm. Probably a switch going bad, something like that. If you just want to disable the alarm function, you can do that in adaptations.

No DAS.
All I have is a Foxwell 510 Elite. It does some surprising things for it's cost. I will see just how far it will go.
Also, time to do a thorough exam of that SAM and make sure all the electrical contacts etc are good and clean and dry. and check the module which I believe is in the trunk on the left side.

 

[TPBenz]

When my e55 was going haywire it was caused by that siren. It would go off randomly and keep going off. If I recall it was the same for the 230 as well. Unplugging it took care of both problems I believe in both cases. If I recall the e55 was doing it after it rained. I believe they are the same sirens.

Weather has not been good here for crawling under the car, but it is supposed to get warmer later in the week.
I will pull the plug on that siren and see if anything happens.
I read a lot of info on that siren when trying to find info on the alarm, but then nothing to tie it to flashing lights.
I wonder how they are wired. I would guess the module gets the signal to activate the alarm and then sends power along one route to activate the siren and another route to start flashing the lights.
Purely a wild guess.

 

[LarryD68]

I had alarm module fail from battery leakage in my 2004 Sl55. I pulled the alarm module from my 2002 S500 and found it is the same PN but doesn't have the built in battery. I installed it in my Sl55 and alarm works fine. I left the S500 with no alarm module which also works fine (obviously no alarm). I don't know what year MB started putting batteries in the alarm module but you might go to salvage yard and get one from a 2002 or older MB and avoid the battery issue and save some money.

 

[Witek_M]

I had alarm module fail from battery leakage in my 2004 Sl55. I pulled the alarm module from my 2002 S500 and found it is the same PN but doesn't have the built in battery. I installed it in my Sl55 and alarm works fine. I left the S500 with no alarm module which also works fine (obviously no alarm). I don't know what year MB started putting batteries in the alarm module but you might go to salvage yard and get one from a 2002 or older MB and avoid the battery issue and save some money.

All alarm sirens have battery inside.
Same part number fits about anything out there.
219 820 32 26 replaced by 219 820 32 26 64.

 

[TPBenz]

I am prepared to buy one if needed to stop the lights from flashing. Otherwise, I would just as soon not have an audible alarm. They are nothing but a pain and nobody pays attention to them anyway.

 

[TPBenz]

I had alarm module fail from battery leakage in my 2004 Sl55. I pulled the alarm module from my 2002 S500 and found it is the same PN but doesn't have the built in battery. I installed it in my Sl55 and alarm works fine. I left the S500 with no alarm module which also works fine (obviously no alarm). I don't know what year MB started putting batteries in the alarm module but you might go to salvage yard and get one from a 2002 or older MB and avoid the battery issue and save some money.

When you say "module" you are referring to the actual siren in the front fender, correct?
Parts diagrams show an actual module that is mounted in the left side of the trunk.

 

[LarryD68]

Yes, alarm inside the front fender.

As for the battery, the reason I say there is no battery is that the alarm module doesn't have the battery recycling/warning on the case like the newer modules with the battery. Maybe the warnings weren't required in 2002? As I recall it was also physically heavier than the 2005 version.

 

[cdk4219]

I have disconnected mine from all the Mercedes I have from this era( 5 of them) and the lights still flash, but no chirp or siren. I agree nobody pays attention to them, and I rarely park them in areas that I would be concerned, and realistically they aren’t worth that much, because they are old Mercedes cars, that most smart people wont buy because of constant repair.

 

[cdk4219]

When you say "module" you are referring to the actual siren in the front fender, correct?
Parts diagrams show an actual module that is mounted in the left side of the trunk.

Yes that’s what I am referring to

 

[cdk4219]

Yes, alarm inside the front fender.

As for the battery, the reason I say there is no battery is that the alarm module doesn't have the battery recycling/warning on the case like the newer modules with the battery. Maybe the warnings weren't required in 2002? As I recall it was also physically heavier than the 2005 version.

 

[cdk4219]

I believe they may be the same from 96 to 2012, but these are the ones I have issues with, and they do have batteries that go bad

 

[TPBenz]

View attachment 2803162
View attachment 2803161

#7 in that diagram is what I was referring to as "Module".

 

[MikeJ65]

I think #7 is the tow sensor, it is on the left side of the trunk, close to the keyless go module position. There is not really an alarm module, just the siren. Alarm is determined by Driver's SAM based on sensors read by it and other modules. It triggers the siren, lights, etc. The siren is not technically a module, but does have its own power and once triggered it needs to be silenced by the SAM. Disconnecting the batteries or vandalizing the SAM will not turn it off.

 

[TPBenz]

I just scanned for alarm codes and came up with 2.
1) B1-341 fault in communication with component H3 Alarm Horn. This was "Stored" and "Current" and won't clear.
2) B1 009-000 ATA Alarm ended because undervoltage<7volts "Stored".

So I am guessing to unplug the alarm and see if I can clear Code 1. If so, Maybe i will be lucky and it will solve my problem with no siren hooked up. Or, I may have to buy a new siren and hook it back up to have a "complete" alarm system? (guessing).

 

[cdk4219]

#1 is the siren. Unplug it and see if that fixes it.