Alarm siren problem on 981

[clrboxster]

Hi, my 4-way flashers start flashing when the car is locked and without any one near the car. They flash for 2 or 3 minutes then stop. I locked the car whilst inside and opened the glovebox, the flashers flash but no siren. My concern is the flashing will run down my main battery although it seems not to last very long. I am assuming the siren battery is no longer any use. my question is, can I simply disconnect the siren? Will this create any other issue? Am I going to have to replace the siren at an amazing £195

 

[Motorhead]

I seem to recall someone on this or the Cayman forum mentioning the same problem a long time ago, but good luck trying to find the thread using the near useless forum SEARCH facility.**

I’m sure that the siren’s a sealed unit, but perhaps it’s possible to break into it to replace the battery? I also seem to recall mention that a siren from somewhere in the VAG [Skoda maybe?] will work. Most likely it’s the same as the Porsche unit but will have a different part number … and will be a lot cheaper!

Jeff

**Edit: Have a look at this post: https://www.porscheclubgb.com/forum/threads/alarm-sounder-replacement.158019/

 

[clrboxster]

Another question, when you lock the 981 does the horn (or siren) make any sound or is it just the locking and th flashing lights twice?

 

[clrboxster]

I seem to recall someone on this or the Cayman forum mentioning the same problem a long time ago, but good luck trying to find the thread using the near useless forum SEARCH facility.**

I’m sure that the siren’s a sealed unit, but perhaps it’s possible to break into it to replace the battery? I also seem to recall mention that a siren from somewhere in the VAG [Skoda maybe?] will work. Most likely it’s the same as the Porsche unit but will have a different part number … and will be a lot cheaper!

Jeff

**Edit: Have a look at this post: https://www.porscheclubgb.com/forum/threads/alarm-sounder-replacement.158019/

Thanks Jeff, it demonstrates exactly the problem I have. Cannot believe it costs £250 (I forgot the VAT)

 

[Stirls]

Our 981 B & C just flash. No noise. Pressing button on fob twice disables interior/motion alarm for ferry crossing I recall. If you are considering buying replacement unit, it would be worthwhile trying to open the so called sealed unit I would have thought first as BMW rechargeable keys were sealed but now relatively easy to replace batteries within if you can solder. Defo someone else raised this a few months back so maybe further update to follow. As I’ve bemoaned previously, we should have technical issues within buyers guides to prevent having the same discussions again and again. Just seen the old thread link re circuit board corrosion rather than battery backup.

 

[clrboxster]

Our 981 B & C just flash. No noise. Pressing button on fob twice disables interior/motion alarm for ferry crossing I recall. If you are considering buying replacement unit, it would be worthwhile trying to open the so called sealed unit I would have thought first as BMW rechargeable keys were sealed but now relatively easy to replace batteries within if you can solder. Defo someone else raised this a few months back so maybe further update to follow. As I’ve bemoaned previously, we should have technical issues within buyers guides to prevent having the same discussions again and again. Just seen the old thread link re circuit board corrosion rather than battery backup.

Thanks for the comment, I have seen a few when dismantled and it seem the boards corrode. I will have to buy a new one methinks ! when you open your boot or front but don’t open it just leave after pressing the fob, if you then lock the car do you get a ‘chirp’ to remind you something is not closed correctly? I’m sure mine used to do that but not now

 

[Stirls]

Thanks for the comment, I have seen a few when dismantled and it seem the boards corrode. I will have to buy a new one methinks ! when you open your boot or front but don’t open it just leave after pressing the fob, if you then lock the car do you get a ‘chirp’ to remind you something is not closed correctly? I’m sure mine used to do that but not now

Frunk ajar, Yes, one chirp, no flash. Closed, two indicator flashes.

 

[clrboxster]

Frunk ajar, Yes, one chirp, no flash. Closed, two indicator flashes.

Thanks, interesting set of words, who would know what we are talking about
Frunk, ajar, chirp, flash
haha
i have no chirp

 

[clrboxster]

Ah, don’t you just love Porsche problems and prices

NOT

 

[Motorhead]

I think you’ll find that you get the chirp if the glove compartment lid is open as well, and I seem to recall that I had it when the alarm module failed on my 987.2 CS many years ago, thankfully when it was under warranty.

As said, you’ve got nothing to lose by trying to open the siren unit. It could just turn out to be a battery issue and not a cooked circuit board.

Jeff

 

[clrboxster]

I think you’ll find that you get the chirp if the glove compartment lid is open as well, and I seem to recall that I had it when the alarm module failed on my 987.2 CS many years ago, thankfully when it was under warranty.

As said, you’ve got nothing to lose by trying to open the siren unit. It could just turn out to be a battery issue and not a cooked circuit board.

Jeff

Thanks Jeff, I will take a look at it.

 

[malarcy]

Chris

Take a look here 6:02 into this vid. It’s a VW part - the guy lists the part numbers I think.

 

[clrboxster]

Hi, thanks to all those who answered my question. I am pretty sure it is a faulty alarm module. Porsche direct with PCGB discount is £203 which is much better that Design 911.