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Alarm issues

devans

devans

New member
Hi, not been on here for a while as I laid my Porsche up for two years. However, looking to get it back on the road now as I’m missing it. However, whether the car is alarmed or not.... the alarm keeps sounding. When I use the alarm unit it clearly clicks and the lights blink twice when locking and once when unlocking which would indicate to me that the unit is talking to the car. I could understand the alarm going off if a window is left open or a catch isn’t quite making a connection, however, I cannot understand why it’s going off when not set. Central locking seems fine. Only things I have done are 1. Fully charged the battery and 2. Disconnected the rear and front bonnet operating levers by the drivers door which I needed to do to get the bonnets open when the battery was flat. Any help would be appreciated. Thanks
 
Charging the battery is one thing, it holding the charge is another..... have you had any issues with windows lowering or the rear spoiler coming up?

Strangely, this does happen when battery is faulty & obviously depletes it further + it triggers the alarm siren....

 
Hi, thanks for your response, however battery is fine and no issues with windows. Spoiler is a fixed GT3 dual blade.

 
The battery remains the most likely culprit. What happens when your battery charger is attached to the car? If that cures the problem it would confirm the battery is the issue. If not it will be an alarm unit fault.

 
I would suggest temporarily disconnecting the tilt sensor and siren. It might be that the siren backup battery is low/failing, or the tilt sensor has water ingress. Switch on the ignition before disconnecting. You will probably get a single beep on locking, but at least it might eliminate these devices from the possibilities.

 
I had this a year or so ago, alarm would go off for no reason , locked or unlocked , as Richard has said the tilt sensor gets moisture in it , so I took mine out and removed the alarm siren too. Everything still works fine , locking / unlocking etc. I did contact my local OPC , evidentiary there is a upgrade tilt sensor available that is repositioned under the passenger seat and I think the kit cost was around the £350 mark. The original one is next to the main car battery , which I’m sure you know already !

75PNO

 
Thanks Richard and 75 pno. As I stated earlier it's definitely not the battery as it holds 12.9 volts and was fairly new when I laid the car up. I know things can play up once the battery drops below 10volts but this issue is a new one. If I put the key in position, disconnect battery then reconnect and start the car, everything is fine. However, as soon as I switch the car off and remove the key I get a beep and the alarm sounds. At this point nothing can switch it off. If I try to put the key back in the ignition, if I set the alarm with the key fob and then set the alarm off.....nothing works with regards to cancelling the siren. Only goes off when disconnecting the negative terminal. The whole issue therefore starts when I remove the key from the vehicles ignition switch.

i will look at removing the tilt switch and siren and give a clean but with this latest information do you think it can be anything else. As I say, it is triggered when I take the key out of the ignition switch, thanks

 
Hi Richard, I've just posted an update on the alarm issue to see if you feel it can be anything else. However, you mentioned siren back up battery. Is this on the siren itself? If not, can you point me in the right direction please. I will have a look tomorrow, thanks

 
Forget that Richard, just took off the backup battery box. It does have 4 screws but is pretty much a sealed unit so I'm assuming the whole thing would need replacing. The tilt switch box also looks to be a sealed unit. Apart from cleaning contacts there's not a lot that can be done with either I suppose

 
The backup battery is inside the siren itself. I think that the backup battery voltage may be too low, and when you remove the key from the ignition it "thinks" it is being disconnected and sounding. Cleaning it probably won't do any good, but if you disconnect it (with the ignition on) it might at least eliminaate it as being the culprit.

 
Guys, had both the siren battery backup out and the tilt switch. As I said earlier, both units look pretty much sealed. Contacts to the tilt switch were shocking. Green and difficult to clean. However, contacts cleaned as best as I could and 'hey presto' success. Hope it lasts this time. ive always wondered if my unit was. Sat correctly in the car ever since I bought it years ago as the bracket that holds it all has always looked bent. The rubber shock absorber at the bottom was always in the middle of nowhere so while I was fitting it back I bent th bracket so the shock absorber was touching the bulkhead where I think it should be. Let's hope it all remains working before the neighbours start complaining. Many thanks for all your help again. Stay safe

 
Excellent news re your fix & at no cost apart from your time..... a good point of reference for all us 996 er's should we ever experience similar.......

Thanks for posting your +ve result

 
Cheers Kasspa, I attempt almost anything when trying to fix faults. However, would not be able to solve much if it wasn't for the advice I receive on this forum. It is always my first point of call and over the years have been very appreciative of everyone's comments, in particular Richard. Just got to refurbish wheels now and look at getting it on the road for the summer. All serviced and just about ready to go

 
Yes, what would we do without Richard's amazing knowledge..... [:)][s3]

I must admit my 4S has been idle despite never SORNED & am eager to give her a 'blast'.....

 
Back again with the annoying alarm issue as my fix clearly only lasted a short while. I've now removed both the siren and tilt sensor until I can decide the best way forward. Upon further investigation I have noticed that the tilt sensor box seems to have alot of water inside. How, i don't know as its a sealed unit. My suspicion is that this is possibly what is setting the alarm off. Has anyone tried to resolve this issue? Will drilling a hole in the bottom of the box drain off the water or has anyone opened up the tilt sensor box by cutting it open and then resealing it thus gaining access to the tilt sensor to enable a thorough clean? Many thanks

 
Yes, drains are clear. I'm assuming that the water/moisture in the tilt sensor box is so much that its interfering with the contacts etc.

 
Update...I believe my current tilt sensor part number 996.618.265.00 was upgraded to part number 996.618.265.01. However, during this upgrade porsche decided to make things difficult by ensuring the new unit required a different bracket and wire which connects the tilt sensor to the siren. So not only £230 for the tilt sensor but an additional £43 for the cable Nd £10 for the bracket....ridiculous.

Anyway

1. How can I test my sensor to ensure that this is the issue and

2. Has anyone ever cut the tilt sensor box apart to gain access to the parts for cleaning and then resealed

Any advice appreciated

 
Hard to see much water should get into the sensor box if the drains are ok as it's raised off the bottom panel, have you noticed much water there?

could it be coming for a faulty windscreen washer jet tube (just a thought)

I would dry the sensor out and put it in a sealed plastic bag and keep an eye out for water.

good luck

 
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