alarm help

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   my 97 e39 alarm sits quiet through the night and goes off in the daytime unmoved and untouched !can the temp effect it ?confused i am,is it possible to adj it at all,switch it off,where the heck is it ?as far as I`m aware its a std factory full closure alarm.
Door/boot opening,closure,deadlocks, interior lights and flashing led on mirror all work correctly !Couldnt be car battery as starts fine and has had a good run -could it ?  Help please.  

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carmadpaul Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23-August-2004 Status: Offline Points: 1	Topic: alarm help Posted: 23-August-2004 at 21:07
	my 97 e39 alarm sits quiet through the night and goes off in the daytime unmoved and untouched !can the temp effect it ?confused i am,is it possible to adj it at all,switch it off,where the heck is it ?as far as I`m aware its a std factory full closure alarm. Door/boot opening,closure,deadlocks, interior lights and flashing led on mirror all work correctly !Couldnt be car battery as starts fine and has had a good run -could it ? Help please.

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thaskitz Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13-August-2004 Status: Offline Points: 9	Posted: 23-August-2004 at 21:22
	i do the valleting for a local honda dealer and when it is hot the cars in my unit lock themselves one after the other (even with the keys locked in the safer box!) the technitian at the dealer says its changes in atmospheric pressure might be a similar thing here????

Deathace Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Really Senior Member I Don�t stick keys in electrical sockets. Joined: 27-December-2003 Location: Norfolk Status: Offline Points: 333	Posted: 24-August-2004 at 07:24
	Alot of alarms that use ultrasonic sensors suffer this problem due as thaskitz says to change in air pressure/temperature. The reason is that it detects changes in the air flowing past the sensors and sees a change as an intrusion. Try parking the car in a shady area during the day to see if it still does it. I can't say for the newer alarms but the older ones had a switch to allow you to disable the ultrasonics in case of hot days or leaving the windows open. Russ
	1990 535i SE Auto Metallic Glacier Blue, Low Mileage, M-Tech Bodykit, Full Leather & Various Custom Mods.