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Thread: Alarm Issues

  1. #1
    Join Date
    Dec 2010
    Location
    Newbury Park, CA
    Posts
    167
    My Cars
    1995 BMW 850CI

    Alarm Issues

    FYI. Don't drive the 850 too much but my other car is in the shop so I took it out. Drove it a couple of days and got it smogged (CA) and it passed on first try. I noticed the key fob wasn't working. I locked it with the key, but once or twice within 30 seconds after locking it the alarm went off. A day later I left it at the airport and the alarm did not go off, at least not in the first couple of minutes, so I left it locked for 2 days and had no issues initially when I got back. Then the fob started working. But today I locked it and maybe 10 minutes later the alarm went off for a bit then stopped. This continued every few minutes until I unlocked it. I remembered a couple of years ago I had an issue where the alarm would chirp every so often if it was locked. I had washed the car so after searching the forum I disconnect the left hood latch sensor and the chirping stopped. So a few hours ago I reconnected the sensor hoping that it had dried out and wouldn't be a problem. Well, it's been in the garage locked since then and no more false alarms. Strange I didn't notice the issue when I first disconnect the sensor. All is good for now. And it's nice to be getting comments at the gas station and the looks at traffic lights.
    EricinConejo

    1995 850CI, 1959 Chev Impala, 1965 Cessna 172, 1986 Mustang GT, 2002 Mustang GT, 2005 Dodge Durango Hemi, 2016 Land Rover Discovery Sport

  2. #2
    Join Date
    Sep 2008
    Location
    Santa Barbara
    Posts
    3,462
    My Cars
    91 Dinan860 & 91 850 6sp
    might be time for new batteries (in the car, not the remote)
    '91 Dinan 860 Stage III (new 6L engine)
    '91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
    '91 850i 6sp (mint) (sold)
    '90 Dinan 750iL TT stage III (Guido - The Beast)
    '94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
    '96 850Ci, The George Carlin car
    ''73 3.0 csi, '08 535i, '03 X5 4.6is
    ...and a few other non BMW cars

  3. #3
    Join Date
    Jul 2007
    Location
    Cave Creek, AZ
    Posts
    1,117
    My Cars
    1993 850ci 2001 M5 / Z3M
    E31’s built after 1993 have a siren that contains a battery, these batteries go bad with age and tend to cause issues like false alarms as well as cause main battery drain. The siren can be taken apart and the batteries can be replaced. Others may have more information on this topic.

    Early cars, with non integrated key fob remote have simple horns for the alarm and do not contain batteries.
    Last edited by bdiefAZ; 04-18-2019 at 11:08 PM.
    Regards,

    Brian
    Cave Creek, AZ

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