Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  1. #11
    Join Date
    Jun 2012
    Location
    Socal
    Posts
    1,739
    maybe it's one of the other sensors, like the tilt or interior sensor going bad?

  2. #12
    Join Date
    May 2020
    Location
    SF Bay, CA
    Posts
    1,266
    Another thing that could affect the alarm are the windows. I've noticed with mine that if I open the door, disconnect the battery, and close it, the window goes lower and lower as it thinks it needs to clear the seal even if it's already cleared. Far fetched but maybe try opening and closing your windows and sunroof?

    Sent from my SM-G781W using Tapatalk
    2004 BMW 330CI ZHP (well, technically ZAM)


  3. #13
    Join Date
    Nov 2017
    Location
    Irvine, CA
    Posts
    818
    Small update:

    I contacted that GM5 guy with the symptoms and he replied that it's not the GM5 module.
    I changed the tilt sensor in the trunk with another one I had, no change. Siren still goes off after 5 seconds of locking the car with the key.
    I unplugged the interior sensor and the siren doesn't goes off anymore. Behavior seems to be as it should, albeit without the interior sensor.

    Seems like a new interior sensor might be needed.

    Thanks to everyone for the ideas, I'll report back after I have some time to mess with it again.

  4. #14
    Join Date
    Jun 2012
    Location
    Socal
    Posts
    1,739
    Hopefully that's it. You could borrow my interior sensor to test, if you want, before you buy another one. It's not like my car moves lol

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