E39 m5 alarm issue

garyeagle · 07-09-2025, 06:12 PM

Hi, I have 2001 bmw e39 m5 with the alarm issue. It goes on seconds as soon as i lock the car. It started suddenly one night out from nothing. How to diagnost the issue or turn it off? I saw references to hood sensor but the one that i uave is work properly. May that be the issue with the mirror sensor? Also, the car stays that the trunk lead is open sometimes while I’m driving. May that be an issue and how to fix that? In general, if i disconnect the syren will that drain the battery if the alarm technically will be still on?

CardadX3 · 10-07-2025, 05:33 PM

I have a similar issue with my 2003 540i. Did you ever resolve the issue on your car? I suspect the rechargeable alarm batteries need to be replaced, but I would like to verify the cause before I start replacing parts.

07-09-2025, 06:12 PM	#1
garyeagle Registered 0 Rep 1 Posts Drives: e39 m5, e61 n54b35 Join Date: Jul 2025 Location: Los Angeles iTrader: (0)	E39 m5 alarm issue Hi, I have 2001 bmw e39 m5 with the alarm issue. It goes on seconds as soon as i lock the car. It started suddenly one night out from nothing. How to diagnost the issue or turn it off? I saw references to hood sensor but the one that i uave is work properly. May that be the issue with the mirror sensor? Also, the car stays that the trunk lead is open sometimes while I’m driving. May that be an issue and how to fix that? In general, if i disconnect the syren will that drain the battery if the alarm technically will be still on?
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10-07-2025, 05:33 PM	#2
CardadX3 New Member 26 Rep 6 Posts Drives: 2020 BMW X3 M40i Join Date: Sep 2025 Location: USA iTrader: (0)	I have a similar issue with my 2003 540i. Did you ever resolve the issue on your car? I suspect the rechargeable alarm batteries need to be replaced, but I would like to verify the cause before I start replacing parts.
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