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Thread: Factory Alarm Not Working After New Stereo Install

  1. #1
    Join Date
    Oct 2006
    Location
    Sacramento, CA
    Posts
    14
    My Cars
    1999 M Coupe (Estoril Blue)

    Factory Alarm Not Working After New Stereo Install

    Okay, got a 99 M Coupe with the factory alarm and keyless entry system. I upgraded the stereo to something way nicer than stock. After I did so the keyless entry stopped working (I have not checked that the alarm still goes).

    Used to be, you'd hit the [Lock] button on the key fob, there'd be one beep from the car and the doors would lock. Hit the [Unlock[, get two beeps, everything unlocks.

    Now, if I hit either button, I get three beeps and nothing happens.

    I suspect, since the factory head unit is wired into the alarm system, it's freaking out because the deck is gone now so it's disabled the keyless entry to let me know that someone stole my deck (in its thinking).

    Any suggestions on how to fix this without having to go buy a whole new alarm? Or if I do have to buy a whole new alarm, I've heard it's pretty easy to just replace the original unit, any suggestions on that?

  2. #2
    Join Date
    Sep 2003
    Location
    St. Louis, Missouri
    Posts
    5,027
    My Cars
    looking.
    its not. you're very far off.

    YOU HAVE:
    Not used the search button
    No Idea what the 3 chirps means



    Your car has -
    A bad hood sensor
    A bad door sensor (or both)
    A bad trunk sensor

    The 3chirp means "I'm not ready, something's open"

    I will gladly sell you a whole new alarm, even though you do not need it.
    I will also sell you whatever sensor actually went bad.

    For the locations of them, use the search button; we have gone over this topic adnaseum.

    The door ones often are the problem. Take your waterpump pliers, grab the cylinder on the latch on the b pillar, rotate it 90 degrees; problem probably solved.



    Best of luck

    "Welcome to the board"
    for sale: used Dynaudio System 360 from my M3. PM for details

  3. #3
    Join Date
    Jun 2006
    Location
    Australia
    Posts
    24
    My Cars
    328i Convertible

    head unit sensor

    My alarm was not working when I got the car.

    Never figured it out until I removed my head unit, the rear 'finger' that kept the head unit located was missing. It pokes into a hole with a micro-switch in it... no radio - alarm goes off I guess.

    You need to either get something poking into that hole again, or like me, disable the switch so the alarm thinks the radio is still there.

    Alarm now works - cool!

  4. #4
    Join Date
    Apr 2005
    Location
    Los Angeles, CA
    Posts
    3,916
    My Cars
    1995 M3
    I KNOW THIS ID OLD, But BRAVO! Thanks for that post, forums STILL rock!

    Quote Originally Posted by BNG328i View Post
    My alarm was not working when I got the car.

    Never figured it out until I removed my head unit, the rear 'finger' that kept the head unit located was missing. It pokes into a hole with a micro-switch in it... no radio - alarm goes off I guess.

    You need to either get something poking into that hole again, or like me, disable the switch so the alarm thinks the radio is still there.

    Alarm now works - cool!

    Current: 1995 M3 Street, 1997 M3 Track, 1999 Ford F-350 Powerstroke Tow Vehicle
    Past: Audi B7 S4 Avant, Lotus Elise, E46 330ci, E30 325i, E36/7 M Coupe, 1993 MX-6 V6, 1967 Ford Fairlane GTA, 1972 Dodge Dart Swinger

  5. #5
    Join Date
    Jan 2018
    Location
    Houston
    Posts
    1
    My Cars
    2011 328i
    So, I too have an issue with my 2011 328i after the installation of a Pioneer NEX 5201 navigation system. There are a couple of issues that I'm having:

    -My keyless entry is only working immediately after I turn the car off after it sits for a long duration of time it doesn't work for a while and then it finds power somewhere and starts to work.-My SOS light is now on...
    -they wired up the power source directly to the jumper terminal


    I think the power lead is has everything to do with it but they are telling me that is a standard function for BMWs instead of running it to the battery in the back...

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