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Resolving Alarm Issue That Sounds Without Reason

Model: BMW Serie 5 E39 - Years: 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
Part: Checks and maintenance

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Video tutorial

If you own a BMW (both Series 3 and Series 5, any version) and suddenly, after locking it with the remote, thus activating the factory alarm, it starts sounding without any apparent reason, one possible cause is a malfunction of the hood closure switch, located near the cabin air filter housing on the driver's side.

Its malfunction is interpreted by the alarm control unit as an attempted break-in; even if the hood is perfectly closed, the switch signals that it is open, causing the alarm to sound.

There are two possible solutions: one is very quick and inexpensive by disconnecting the switch connector, and the other involves replacing the switch itself.


Updated on 10 February 2026 by ScegliAuto


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