QUESTION: Does E90 alarm go off if glass breaks?

JBizzle · 09-09-2007, 04:40 PM

Subject says it all. I have searched but cannot find the answer. I have a 2006 325i without an alarm. I see there is a DIY to retrofit the factory alarm with relatively little effort. I am considering buying the parts and retrofiting my car with the alarm.

I'd imagine the alarm protects (will sound) if the doors are opened or the hood is opened; however, does it sound if the windows are broken?

Thanks!

etik · 09-09-2007, 05:14 PM

Yes it does, well I've never tried but there are sensors in the car to detect any interior movement, can be disabled with the car key when you leave mamy in your car for example.

redline2 · 09-09-2007, 07:25 PM

Quote:

Originally Posted by JBizzle

Subject says it all. I have searched but cannot find the answer. I have a 2006 325i without an alarm. I see there is a DIY to retrofit the factory alarm with relatively little effort. I am considering buying the parts and retrofiting my car with the alarm.

I'd imagine the alarm protects (will sound) if the doors are opened or the hood is opened; however, does it sound if the windows are broken?

Thanks!

My understanding is that there is no "shock" or "vibration" alarm but it will trip the alarm if glass falls inside the cabin as there is an internal ultrasound sensor to detect cabin motion. Other sensors include tilt (someone lifting car into flatbed truck) and door/hood/trunk switch sensors.

Bimmer330i · 09-10-2007, 09:05 PM

If you install the alarm... BE SURE TO MAKE THE DEALER REPLACE the ceiling dome light cover to the SLOTTED version... otherwise the motion sensor won't work. I just had this done... and I cannot find the replacement part anywhere... and even having trouble getting one from local dealers.

ca1242 · 09-11-2007, 11:52 AM

Motion sensor will not detect a glass breakage.

A glass break sensor has a microphone and "listens" to the specific audio signature of breaking glass, which the OEm alarm doesn't have.

Even a shock sensor will not detect glass breakage if it is broken with a pointy object, which most thieves do. If someone throws a brick to a window, it might set off a shock sensor.

09-09-2007, 04:40 PM	#1
JBizzle Private First Class 14 Rep 109 Posts Drives: 2009 BMW 328i Join Date: Aug 2006 Location: Houston, Texas iTrader: (3) Garage List 2000 BMW Z3 2.3 [0.00] 2009 328i [0.00]	QUESTION: Does E90 alarm go off if glass breaks? Subject says it all. I have searched but cannot find the answer. I have a 2006 325i without an alarm. I see there is a DIY to retrofit the factory alarm with relatively little effort. I am considering buying the parts and retrofiting my car with the alarm. I'd imagine the alarm protects (will sound) if the doors are opened or the hood is opened; however, does it sound if the windows are broken? Thanks! __________________ 2015 Mercedes-Benz E250 BlueTec - Lunar Blue - Black MB-Tex - Bi-LEDs - Sport 2000 Z3 2.3 - Silver - Black Leather - 5MT - Premium - SOLD at 28k miles 2009 328i - Monaco Blue - Black Leather - 6MT - ZSP - Xenons - Logic7 - Premium - SOLD at 76k miles 2006 325i - TiAG - Black Leather - 6MT - Sport - Xenons - Euro-Tails - 26k miles - RIP
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09-09-2007, 05:14 PM	#2
etik Private First Class 20 Rep 136 Posts Drives: BMW 320D Join Date: Dec 2006 Location: Belgium iTrader: (0)	Yes it does, well I've never tried but there are sensors in the car to detect any interior movement, can be disabled with the car key when you leave mamy in your car for example. __________________ 07' Yamaha WRF450 07' BMW e90 320d 03' Yamaha R6 00' BMW e46 320d - RIP
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09-10-2007, 09:05 PM	#4
Bimmer330i Private First Class 1 Rep 126 Posts Drives: 2006 e90 330i N52 Join Date: Sep 2007 Location: Saratoga, NY iTrader: (0)	If you install the alarm... BE SURE TO MAKE THE DEALER REPLACE the ceiling dome light cover to the SLOTTED version... otherwise the motion sensor won't work. I just had this done... and I cannot find the replacement part anywhere... and even having trouble getting one from local dealers.
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09-11-2007, 11:52 AM	#5
ca1242 Registered 0 Rep 3 Posts Drives: E46 330 Join Date: Jul 2007 Location: Gaithersburg, MD iTrader: (0)	Motion sensor will not detect a glass breakage. A glass break sensor has a microphone and "listens" to the specific audio signature of breaking glass, which the OEm alarm doesn't have. Even a shock sensor will not detect glass breakage if it is broken with a pointy object, which most thieves do. If someone throws a brick to a window, it might set off a shock sensor.
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