[bombfactory]

And by 'goes off' I mean 'goes on' - horn-a-wailin'. I think I might have fried something during the latest chapter in my ongoing stereo install adventure, but who knows? If I lock the car, 15 or 20 minutes later the alarm is somehow triggered. I've pulled the 'alarm - central locking' fuse, but nothing has changed, it still happens. Anyone run into this particular gremlin before?

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[flash]

sounds like one of the pin switches is stuck. check them all, including the glove box, the one at the hatch, and the one under the hood.

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[jg968]

This is an interesting topic. My son's '92 had the alarm go off in the middle of the night for no apparent reason, so he asked for some help in finding the problem. We took both door pin switches out and cleaned them. Guess what, when you look at the switch, you soon realize that the alarm circuit is normally open when the door is shut and the little plunger is in. When the door is opened, and the switch plunger extends, the switch makes the connection to ground. Interior lights come on and alarm too I suppose if enabled. I could see no apparent way for the switch to stick, i.e. close the circuit. The plunger and grounding pin are attached. Plunger moves in - grounding pin goes with it making the open circuit.



The hatch is also interesting. The switch is connected to the hatch shock on the passenger side (for the coupe). The circuit is open when the hatch is closed because a plastic tube slides between the copper contact and the shock shaft. Again, I can see no way for the circuit to close with the hatch down unless the plastic tube that interrupts the circuit would break and come off. But that would be very apparent.



We could find no switch for the hood.



Bottom line - clean the switches. Dirt, corrosion and moisture - who knows what amount of leakage current could cause the circuit to close and cause the alarm to go off.

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[tamathumper]

Is it the same amount of time, each time? Does the stereo have a courtesy timer for playing X minutes after the doors are locked? An incorrect wiring choice might have something like the subwoofer or power antenna going "off" (or to ground) after X minutes, and using the alarm wire would perhaps mean triggering the alarm.

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[unknown4u]

You can turn the original alarm of by using the passengerdoor. push the central lock button on the console. shut the door. Then you can sleep without disturb by the alarm.

I never use the alarm form the car because who wants to steal a 968 anyway?

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[lbpesq]

I had a problem like this. The alarm would go off by itself anywhere from 5 minutes to 1/2 hour after I locked the car. I started using the "do it from the passenger side" method described above. Then the car started unlocking itself when I drove. I'd lock the doors, drive along, and within 30 seconds, the doors would unlock themselves! My Porsche mechanic traced the problem to some pinched wires beneath the wooden floorboard on the passenger side - where the computer is. I had been in there almost a year before when I installed the RS Barn chip. I guess I must have crimped the wires when I put the whole thing back together and, after many months, it got to the point where I thought my car was haunted. It's been working fine ever since.



Bill

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[bombfactory]

Good tips guys, thanks. I'll definitely be taking a look at the door and hatch switches now. The only thing that has been changed recently, electrically, was when I had a local stereo place splice in a new antenna connector to the back of my head unit. The old one had fallen apart. While he was in there, he noticed that the power wire for the antenna booster was not connected, so he hooked that up to a power wire at the back of the head unit (unfortunately, I still have crappy radio reception, so a new antenna is next on the list). Perhaps the antenna booster should be connected to the 'remote-on' power wire and not a constant power supply?



I wouldn't mind getting rid of the alarm completey either, but just pulling the fuse doesn't do it!

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[tamathumper]

While he was in there,

There's your problem! <img src="/forum/images/smilies/968/wink.png" class="smilie" alt="" />

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[DaveN]

I don't think there is a cure for crappy reception on the 968 except a 2 metre long CB whip!

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[flash]

lol - which would be fine if i could get something other than twang and slang on the 11 meter band

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