1998 e36 328i siren Installation

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  1. 1998 e36 328i siren Installation 
    #1
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    E36_turbo's Car Details
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    328i
    Year of Manufacture:
    1998
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    Hi all,
    My BMW manufacture siren did stop working and as a result I bought an aftermarket siren which comes with a backup battery. The new siren has 4 wires, black(negative), red(Positive), Blue and White trigger negative and positive accordingly.

    However my siren wiring is 5 which are brown and red for negative and positive and then other three which i am not sure how to exactly find which one of those is a trigger negative or positive.

    What i did was I locked the doors using the fob and manually opened the door which triggers the alarm and then I looked for voltage on the 3 remaining wires :
    here are the results:
    red/brown wire: constant 0.54 v
    black/white:around 0.2 to 1 V when alarm is triggered
    purple: same as above

    so I then used the black and white and connected the positive trigger and no alarm sound, i did that for the other 2 and nothing happened. I then used the negative trigger from the siren and connected it with the black/white which worked.

    however here is what the problem is :
    when i open the ignition key I can hear a small "ghzzzzzz" from the siren for less than a sec and then finish. so I went back and connected it to the negative trigger to the purple one and that fixed the ignition sound however here is what happens now:

    when I looked or unlock the door I can hear a "ghzzzzz" sound and once inside the car the internal lighting make a funny "ghzzzz" noise when they turn on and off


    any ideas?
     
     

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    #2
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    i guess i can simplify my question by asking , does any one know what each color mean on the connector which connects to the siren or does any one know a link to 3g mk2 alarm wiring diagram ?

    or do you know how i can find a negative or positive trigger for the alarm ?

    thanks
     
     

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    my last attempt in hope of getting a reply

    to rephrase my question I want to know how can i find the right positive, negative from a wire? I guess this will help me to work out which wire is for where.

    and then try to find the positive/negative trigger which only has a volt in it when the alarm is activated.

    I found the positive by using a multimeter and connect the black lead to the body earth and then do a volt test. there are 5 wires in total one of which has 12 V so I thought it is a constant positive.

    the other 4, 1 of them has a volatge of 0.54.

    i then used a continuity check to find the ground from those three" does continuity check damage a ecu or something? my understanding is that it send a signale so what happen if i by mistake connect a positive and negative lead and then do a continuity check ?

    finally I was left with 3 wires which are the two wire that had no volt and the one which had 0.54v. i then activated the alarm and opened the door thus setting of the alarm and the result was that I had a voltage of 0.3 to 1 in the other 2 wire so here I am really confused on which on those three are the trigger positive or negative wire.

    I hope this makes more sense and some one can help me
     
     

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    #4
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    Quote Originally Posted by E36_turbo View Post
    to rephrase my question I want to know how can i find the right positive, negative from a wire? I guess this will help me to work out which wire is for where.
    Post photo's of the wires from the wiring loom (5 wires ?), then a photo of the siren wires (4 wires ?), along with the make and manufacturer of the siren.

    i then used a continuity check to find the ground from those three" does continuity check damage a ecu or something?
    Continuity is if the circuit is complete - It applies no voltage to it, so should cause NO damage if done correctly !
     
     

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    Quote Originally Posted by Ferret View Post
    Post photo's of the wires from the wiring loom (5 wires ?), then a photo of the siren wires (4 wires ?), along with the make and manufacturer of the siren.



    Continuity is if the circuit is complete - It applies no voltage to it, so should cause NO damage if done correctly !
    Well I can post photos, but as I explained above that is all in there, 5 wires with the colors mentioned in my earlier post and 4 wires from the alarm which is general made one and has a positve and negative plus positive/negative trigger wire.

    What I am struglling to find is the trigger wire on the 5 wiring loom , I have found positive and negative but then have 3 left and don't know which one is negative or positive trigger
     
     

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    #6
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    nas80's Car Details
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    if you want an original siren i have a spare one knocking around.
     
     

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    Quote Originally Posted by nas80 View Post
    if you want an original siren i have a spare one knocking around.
    how much ?
     
     

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    #8
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    Quote Originally Posted by nas80 View Post
    if you want an original siren i have a spare one knocking around.
    did u change ur mind
     
     

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    #9
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    Quote Originally Posted by E36_turbo View Post
    did u change ur mind
    Give him a PM
     
     

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    #10
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    i didnt change my mind lol as its not really useful to me, i just thought it would be a good idea to keep it when i scrapped the donor car.

    i would need to test it somehow as I actually never tried to make it go off?! I dont want to send it you and then it be knackered,

    but you can have it free if you pay the postage?
     
     

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    E36_turbo (08-10-2011)

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