1994 E36 325i - 3G (Mk1) alarm fobs - Page 2

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Thread: 1994 E36 325i - 3G (Mk1) alarm fobs

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  1.  
    #11
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    Sphinx's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1994
    Transmission Type:
    Manual
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    I spoke too soon; it was working yesterday however it went off last night at 5:30am
    I tried stopping it by pressing the button on the fob but nothing happened and I had to wait for it to stop by itself; the noise eventually stopped but the hazards were still flashing for a fairly long time.
    So this morning I went out to see what's what and again the fob did nothing (although the light was working) so I had to manually unlock it, which set the alarm off, and then switch it off at the siren.
    I noticed the bonnet switch connections were pretty cruddy (maybe the cause of the alarm going off that night?) so cleaned them up, switched the siren back 'on' again and still nothing. The fob just doesn't seem to be doing anything whereas is was yesterday.
    Am I right in thinking there is a battery in the siren? but I'm guessing that's fine as it has no trouble deafening me and annoying the neighbours but can a weak battery in the fob cause this? As I say the little red LED still works but could the signal just not be strong enough?

    Any help muchos appreciated
     
     

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  3.  
    #12
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    billywhizz1984's Car Details
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    Always worth getting a new fob battery just to eliminate the issue. Try unplugging the motion sensors from the module as I had issues with these giving false alarms on one of my Tourings.
    Last edited by billywhizz1984; 12-04-2010 at 09:50.
     
     

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    Sphinx (12-04-2010)

  5.  
    #13
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    Yeah I'm going to get a battery tomorrow (why is everywhere closed on weekends! that's when 99% of people have time to buy things...)
    I'm hoping that although the little light comes on, it doesn't have enough power to send a signal. What makes it annoying is that it worked when i tested it yesterday, seems just my luck that the battery would give up now, great timing.
    Which plugs are the motion sensors?
    Also, the button/red light on the centre console is stuck and it doesn't seem to work, can the end with the button/bulb in be replaced or do I need a whole length from the alarm module?
     
     

  6.  
    #14
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    billywhizz1984's Car Details
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    The small red & white plugs are for the motion sensors. You press the LED to disable the motion sensors but if it is stuck it could be confusing the system. They can't be repaired I'm afraid but the wire runs down the side of the transmission tunnel and plug into the alarm loom (4 pin white plug). If fact you could try unplugging the LED to see if that helps, it shouldn't affect the setting of the alarm.
    Last edited by billywhizz1984; 12-04-2010 at 23:50.
     
     

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    Sphinx (12-04-2010)

  8.  
    #15
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    Thanks for all the help Billy, I honestly would have either been completely lost or seriously out of pocket (or both) if it wasn't for your posts here and your guide.

    I've just replaced the battery and it's working again; lesson here is even if the light on the fob does work, it doesn't mean it's actually working.
    Bit of a side note here but I put my multi-meter on the old batt and it was reading around 9v, tested the new batt and it was reading around 16v. I thought the max would be 12v on these as that's what written on them, but I am an electronics noob.

    Now time to see about that button on the centre console.
     
     

  9.  
    #16
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    I can also now confirm that the re-soldering method works.
    I had my local TV repair place do it for me as there was no way I was risking mullering the spare fob that took me forever to find. I asked them to solder 3 new joints and remove 2 old ones and it now works
    Last edited by Sphinx; 12-04-2010 at 16:46.
     
     

  10. Copying a setup??? 
    #17
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    andyw2000's Car Details
    Model of Car:
    525 TDS SE
    Year of Manufacture:
    1995
    Transmission Type:
    Auto
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    Hi, I have a 525 TDS with this system on but when I brought the car I didn't get any fobs.
    Would anybody know if it is possible to copy the solder layout from a know to work system?
    I have brought a key fob but am struggling with finding drawings or photo's of paired matching units.
    If anyone has any drawing or photo's of inside of their fob and inside of the control module that they could let me have it would be much appreciated.
    I though I found the right info last night from the chip drawing that I found but it didn't work.
    I don't really want the alarm to work just the remote central locking.
    If anybody has any ideas it would be much appreciated.

    Andy
     
     

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