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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-09-2016, 10:49 PM   #1
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Join Date: May 2016
Location: Pasadena CA
Posts: 4
My Ride: 2002 325i
alarm goes off on it's own

Car alarm has started going off on it's own, no idea ofwhat's triggering it (it's in plain sight, no signs of foul play or large rodent on hood)

anything obvious I can follow up on right away before considering replacement, could the problem be the keys vs alarm in the car?

( fyi - I haven't searched the forum for this yet, I just joined and we're invited to make a first-time post so this is it )
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Old 07-10-2016, 12:07 AM   #2
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Join Date: Jan 2013
Location: indiana
Posts: 179
My Ride: 2002 BMW 330i
check the hood bonnet alarm switch. usually in passenger side drug bin. I think u can just disconnect it and it should stop. happened to me at a grocery store and a german guy heard it keep going off as he walked by me and said its because a germans not driving it.
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Old 07-10-2016, 12:07 AM   #3
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Join Date: May 2016
Location: Pasadena CA
Posts: 4
My Ride: 2002 325i
thanks glacket!
I searched forum and it also mentioned hood sensor leftside engine compartment by intake, I'll check both, at least to disable the siren
( is the switch stuck because of all the crap I have stuffed in the bin? )

Last edited by e46danial; 07-10-2016 at 12:13 AM. Reason: missed glacket's response and wanted to thank/acknowledge
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Old 07-10-2016, 07:20 AM   #4
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Join Date: Feb 2008
Location: Orange County, CA
Posts: 824
My Ride: 2003 330i ZHP
Had the same thing happening. Just disconnect the hood sensor until you purchase a new one.

2003 330i ZHP 6MT
Performance: Koni Sport Struts/Shocks, Eibach Pro-Kit, 17x9 Apex ARC-8, TMS F&R Sway bars, M3 RTABs w/ Vorshlag Limiters, M3 Strut Brace

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Old 07-11-2016, 01:43 PM   #5
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Location: USA - GA
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My Ride: '04 330i 6mt ZSP ZPP
I also had a bad hood switch that caused the alarm to go off randomly. It's like a $7 part and takes 1 minute to replace.
BMW CCA member - Peachtree Chapter
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2002, 325, alarm, key barrel

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