[chuaed]

Everytime I close the boot lid the alarm goes off... any ideas?


Mine's a 92 cab.


Any advice appreciated.


Thanks guys.

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[94SilverCab]

With the alarm going off, try locking and unlocking your door with the key...

 

Jay

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[unknown4u]

Don't close the boot.? but you can lock the car without using the alarm . Push the button on the console for locking. After that close the passengerdoor.

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[chuaed]

There must be a sensor somewhere that is triggering the alarm on impact?


My central locking button is permanently lit up!


I've grown to accept that issues like these are part of the classic Porsche ownership experience

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[unknown4u]

I think you will have to inspect the other sensors. Hood, dashboard and doors.

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[MCL968]

Lube the lock actuators, the lights will stay on if they don't cycle completely.

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[type968]

Lube the lock actuators, the lights will stay on if they don't cycle completely.

I had a similar issue, my problem is I removed the actuator, and placed it back.  Even after marking were it was, it was out of range, close but not perfect.  This triggered an alarm system fault, which makes the red light on the lock button come on and stay on I believe.  

 

Also check if your door lock light has a rapid or slow flash.  Rapid flash means one of the trigger points was not armed when you arm/lock the car.

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[type968]

There must be a sensor somewhere that is triggering the alarm on impact?


My central locking button is permanently lit up!


I've grown to accept that issues like these are part of the classic Porsche ownership experience

There are no motion sensors that I am aware of on the 968 from factory.  What I suspect is your alarm is not arming properly.  You close the boot, it arms the car but the action of closing it is either arming it and then the motion triggers either the boot switch or some other switch to re-open and trigger the alarm.

 

Here is a hypothetical example of what I am talking about.

 

You open your hood.  

 

Then with the doors closed, boot, glove box, radio etc all in place and switches closed  you arm the alarm.  

 

Your door lock light flashes rapidly, pauses then flashes rapidly again, in cycle.  This indicates the alarm is on, armed, but a sensor point is not primed (This case it is the hood)

 

You then go over to close the hood, but un-beknowst to you, when the hood closes, it will open the alarm trigger circuit, which then fully arms and primes the alarm, but due to something worn, or a mis-aligned latch, the hood rubber bump stops push the hood back up ever so slightly, opening the alarm trigger and closing the circuit, now your alarm goes off.

 

This is how it is supposed to work.  I assume your boot problem is the same.  

 

So what you need to do is check two things:

 

1 With alarm off and doors unlock, is the center console button dark.  

 

2 With everything closed, does the door pull lock knob flash 1 time every few seconds. 

 

If both are true, you are in good shape, if the first shows weirdness, probably an actuator problem.  2nd means you have a trigger point that is not working right with all the places closed.

 

I had an alarm contact that was zip tied by the previous owner because a clip was lost ($4) This allowed enough movement for it to not always prime and caused strange alarm problems.

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[chuaed]

Thanks guys. The alarm issue seemed to have resolved on its own, have not been triggered so far. It must have been a particular sequence which I have not been able to recreate. All good for now.


Appreciate the info shared.

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