buddy911t

My car's alarm has been going off about twice a week at all hours of the night. Never anyone around, no damage ect. I live on a very quite dead end street. I park outside under a large, now bare, oak tree. At first I thought maybe an animal trying to nest in the motor, but with this kind of regularity, I don't know. Anyone else have this problem?

function12

Try double pressing the lock button. You should hear a horn beep. That will turn off the interior motion part of the system. See if that fixes the problem. You might have a issue with that part of the system.

jhbrennan

Double pressing the remote lock button will disable the interior motion sensor but you won't hear a horn beep unless there's a fault condition.

jfoxny

Happens occasionally on my 987. There is another thread about it here:

https://rennlist.com/forums/997-foru...ighlight=alarm

buddy911t

That's interesting, If I hear the horn after pushing alarm button twice there's a fault in the alarm system?

jhbrennan

If you hear two beeps with one push it indicates a fault. It's all in the manual:

Fault indication
A double horn signal during locking indicates a
defect in the central locking or alarm system.

Try locking the car with the hood open and you'll hear it.

function12

Single press of locking button if you hear a beep you have a fault (door open, trunk, boot, glove box). Press the button twice you will hear a beep to let you know you have turned off the interior alarm.

Macster

I avoid whenever possible parking my cars under trees. This of course has nothing to do with the symptom you report.

I just like to avoid the risk of bird mess, or leave/plant trash that collects on the car and which can plug up the water drains, or in the spring the rain of sap that some trees emit, and the risk of damage to the car if a limb (or worse) should come down.

Next, check carefully for any flying insects in the car. I used to leave my Boxster -- in the garage -- with the top down or with the windows cracked when parked in the sun, or leave the windows cracked in my Turbo when parked in the sun and sometimes the sun roof tilted open, but after having several episodes of small flying insects getting in the car and then often not becoming active until after I park and lock the car I never leave the top down and seldom leave the windows open when I park either car.

Lastly, check for signs of moisture/dampness in the car, the carpets on the floor, under the seats, and the carpets along the door bottoms.

Sincerely,

Macster.

jhbrennan

Just went to the garage and tried it - no beep on second press of button that disables interior motion sensor.

function12

Just read the newer manual and it will not beep with a double push on the locking button. It will still turn of the interior alarm and continuous illumation for approx 2 seconds.
Page 24 of the 06 manual.

MBX5

I had the very same issue. I agree with the other posters - the dealer replaced the interior motion sensor and the problem went away.

buddy911t

I made an appointment to have the alarm system checked out. I hope it's covered by CPO.