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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 10-28-2014, 01:50 PM   #1
powpow85
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Alarm going off!!! Help!!!!

Hi guys my factory alarm keeps going off for no reason any ideas what it could be it's driving me nuts, thanks

Last edited by powpow85; 10-28-2014 at 02:12 PM.
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Old 10-28-2014, 02:55 PM   #2
austin.medler
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Youve gotta close your door

but in all seriousness.. my old 3 series did that for the longest time, found out my switch on the trunk wasnt actually being compressed showing the trunk was closed so it would set my alarm off. readjusted the mount and walla was all better.

hope that helps
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Old 10-28-2014, 03:08 PM   #3
powpow85
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Will have a look thanks
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Old 10-28-2014, 05:36 PM   #4
austin.medler
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hopefully thats all it is otherwise you will prob want to do a scan
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Old 10-29-2014, 05:33 AM   #5
powpow85
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Nope didn't work still going off so it's back to the drawing board
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Old 10-29-2014, 06:06 AM   #6
jfoj
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Hood switches are known problems, might just unplug it and see what happens.
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Old 10-29-2014, 09:50 AM   #7
powpow85
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Any ideas where that plug is?
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Old 10-29-2014, 10:20 AM   #8
BMW_Bob
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My Viper uses the stock hood switch and on my E46 it's located on the passenger side towards the firewall. I had a similar problem with my Viper going off because it wasn't pushing the switch down far enough. As a temporary solution I put a few small pieces of duct tape on the hood layered up to push the plunger down farther and the problem went away.
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Old 10-29-2014, 10:22 AM   #9
powpow85
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Ok cheers will have a look
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Old 10-31-2014, 04:09 PM   #10
austin.medler
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Mines in the same spot. Passenger side near fire wall. Right in the empty space.
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Old 11-01-2014, 01:16 AM   #11
beeemerdude
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wouldn't removing the battery cables from battery posts, & waiting,...then re-attatching them (or just the ground, if lazy), stop & automatically re-set the alarm to factory specs?......gotta axe this Q.
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Old 11-09-2014, 09:39 AM   #12
Mattlav
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Hi there,

I had this.. and i found the cure.. basically have you put anything metal (keys, change) in the centre cup holder/slot?

Alarm is microwave and can trigger it

I blogged about it: http://ncs-expert.com/random-e46-convertible-alarm
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Old 11-09-2014, 03:20 PM   #13
powpow85
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Tried all that but still going off!!!!
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Old 11-17-2014, 12:40 AM   #14
Greg330CI
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With the OEM factory alarm on the convertible there are 3 trigger sensors / switches: The hood (bonnet) switch, the tilt sensor (anti-tow away) which is located in the trunk (boot) on the right side behind the trim panel and the movement detector which is located behind the centre arm rest in a small plastic cover on the transmission tunnel. It could be any of these that is causing the problem, or even a loose connection somewhere. The wiring loom for the alarm is complicated unless you are familiar with car electrics / electronics. This wiring loom feeds back to a module behind the glove box and has a number of connection points. A couple of pointers: Does the alarm set correctly initially? Does the "clown nose" then start flashing intermittently when it is set? How long before it triggers after if has been set? Are you closing all doors / windows and roof fully? It may be best to get an error code scan to start with. That would tell you which switch / sensor is causing it to trip. Good luck.
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