E39 alarm question.

Car parked on drive all day. Soon after noon alarm went off. Outside temperature over 25C. Reset it and within a minute it went off again. Reset it 3 times with the same result.
I then set it with the interior and movement sensor disabled, and the alarm didn't go off again. The interior of the car was extremely hot BTW. In the evening when it was much cooler, I reset the alarm to make it fully functional again, and it went through the night without any problem, and has been OK all day.
In the 8 months I've had the car, this is the first time the alarm has given any trouble. Seems it might be connected to the interior car temperature. I would have thaught that unlikely, but the fault, if there is one, seemed to dissappear when the temperature dropped. Coincidence, or could interior temperature be the cause? TIA. Mike.
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Mike,
I once had a problem with a large moth setting off my alarm, only in my case it happened at night when the pest flew up to try and mate with the nearest streetlight. Could there be a little wildlife in your E39 that likes the sun?
Martin
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You could be right, but I didn't notice any insects, airborne or otherwise that may have triggered the alarm.. Mike.

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Had a problem last year with my E38. Similar situation with heat and thought the same but it also happened late evening when cool. I cleaned all the switches and used the key to lock the car for a couple of days.
Investigated further and read that some unscrupulous persons were using radio door bell pushes to set off car alarms and also the JAM the radio key fob signals thus you think the car is locked and really it isn't.
The alarm can also be triggered by computer wireless networks if strong enough and I had it trigger 3 times at work when parked in my usual bay but NEVER 40 foot away in another place in the car park.
My neighbor told me that he had installed a WiFi network at home and soon after my alarm triggered. I asked him it if would be possible to move it to another room or away from the front windows - he did this and the alarm has not triggered since.
Several routes to try and investigate here. Good luck
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I've experienced the same problem, except, the alarm has once gone off in the middle of the night when it is cooler. My car sits in a garage. I've reduced the frequency of the problem by making sure that my windows and sunroof are completely closed.
I had not thought of the WiFi problem before. Probably easy enough to check. Some WiFi run in the 2.4GHz range. If this is the case, then perhaps cordless phones operating in this range could also potentially effect the car alarm.
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