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Thread: how these control buttons work - AC unit from my car - how to press them to work?

  1. #1
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    how these control buttons work - AC unit from my car - how to press them to work?

    well guys didnt know if i should post it in here but heer it goes: I have a ac control unit like the one in here! I had to fix it....cause my buttons are all a mess.....too old....too messy....this is from my BMW E39.

    So i need some help to try these control unit before i get crazy...

    I wanna know how the buttons work...i mean...electronically speaking, how do they function...cause i look at here and dont know really well how they do when we press the button....
    So looking at the pics:

    First:

    the buttons are the white ones...each plastic button needs a row of 2 buttons to be pressed (?!)

    Second:
    The messy plastics that go between the electronic board and the plastic button...thats where i am getting really crazy...cause they are always falling and dont leave me chance to use the button correclty....

    Third

    The control unit plastic front!!!
    Look and give me some help please.

    Thanks.,


    Just need to know cause if i cant use the plastic buttons then i will use a screwdriver and hit the button directly....thats why i wanna know how they work!

    THANKS!




  2. #2
    MySQL Error soundman98's Avatar
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    you took the pics with the circuit board upside-down :P


    it appears that the board is just expecting a the little jumper to short the 2 pads together..

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    Maximum Bitrate Crinos's Avatar
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    These buttons are directly "connected" to the k-bus of your BMW.
    When you press one of the buttons, a hex-decimal signal is sent on the k-bus, and another hex-decimal signal is sent when you release the button.

    Unless you have extensive knowledge about electronics, AND the hardware/software of your BMW. I would leave it alone!

    There are some projects on the HACKTHEIBUS group (Yahoo) that might be interesting for you.

    The fan (down-left for the display) is needed by the AC unit, so you would need to keep this. (it checks the temperature, and air quality inside the car).

    BTW: I thought the whites where LEDS, and not buttons.... The square copper plates are actually the buttons that need to be shorted like Soundman said.

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    The 'white buttons' are LEDS.

    The actual buttons on the circuit board are the gold square pads.


    It looks like the metal strips that make the circuit have come out of the buttons on the faceplate. If the plastic bits that hold them are broken I recommend getting a new faceplate from ebay, scrap yard or a BMW dealer.

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    Quote Originally Posted by Crinos View Post
    These buttons are directly "connected" to the k-bus of your BMW.
    When you press one of the buttons, a hex-decimal signal is sent on the k-bus, and another hex-decimal signal is sent when you release the button.

    Unless you have extensive knowledge about electronics, AND the hardware/software of your BMW. I would leave it alone!

    There are some projects on the HACKTHEIBUS group (Yahoo) that might be interesting for you.

    The fan (down-left for the display) is needed by the AC unit, so you would need to keep this. (it checks the temperature, and air quality inside the car).

    BTW: I thought the whites where LEDS, and not buttons.... The square copper plates are actually the buttons that need to be shorted like Soundman said.
    Thanks for your knowledge for now i dont plan to hack the bus (but one day i will) _I just wanna try the buttons toi see if the control unit is working. In fact i need to try it before i put the buttons back, cause everytime i try to put it they fall and fall again and so i need to fix these, but for that i need to make sure the control unit its ok!

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    Quote Originally Posted by Enforcer View Post
    The 'white buttons' are LEDS.

    The actual buttons on the circuit board are the gold square pads.


    It looks like the metal strips that make the circuit have come out of the buttons on the faceplate. If the plastic bits that hold them are broken I recommend getting a new faceplate from ebay, scrap yard or a BMW dealer.


    When i hear you i am thinking that you are really right!!! The buttons arent the white ones.......sorry.....in fact the faceplate is better go to trash...but for now i dont have another so i guess i will have to try with these one!!! These plastic buttons are really really bad...i have some 2 or 3 broken with time......they are old....and time passes...and the buttoons are really dying slowly!!!

    I just wanna make sure the control unit its ok so i need to try the buttons before i definitely put these on my car again before i get mad!!!

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    Maximum Bitrate Crinos's Avatar
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    Then I understand what the problem is... You do not want to make a new "fanzy" looking, but just want something that works

    From this page: http://bmwfans.info/parts/catalog/E3...oning_control/ You see all the parts and numbers.

    Sounds like you only need new set of buttons. (64 11 8 375 645)
    I'm no expert on E-bay, but I guess you could find new ones there.
    Did a quick search for you, and found this one, buttons and panel.
    http://cgi.ebay.com/ebaymotors/BMW-E...item56396cad47


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    MySQL Error soundman98's Avatar
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    i imagine that if you wanted to control it with a carpc, you could just use a relay trigger each pair of contacts--this way, you don't have to hack the hexadecimal codes or anything...

    for the clips falling out fo the factory buttons, you could attempt to suspend the pins in something like silicone in the button..

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    Quote Originally Posted by soundman98 View Post
    i imagine that if you wanted to control it with a carpc, you could just use a relay trigger each pair of contacts--this way, you don't have to hack the hexadecimal codes or anything...

    for the clips falling out fo the factory buttons, you could attempt to suspend the pins in something like silicone in the button..
    nice idea....how ???? You mean by putting some silicone between the buttons and the metallic pins ??

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    MySQL Error soundman98's Avatar
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    exactly.

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