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Thread: Lexus climate control screen help

  1. #1
    Variable Bitrate skippy911's Avatar
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    Lexus climate control screen help

    I have a climate control screen in my rx300. It is basically a lcd, not a nice pc type though more of a digital alarm clock type. Well, what I am trying to do is to display that info in a pc program but I have no idea how to get it. Is there something I could hook up to the harness and get the data from it? I am fairly good at programming in C++, and VB, but not too familiar with car stuff so any help would be greatly appreciated.

  2. #2
    Variable Bitrate
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    There will be no easy way. You'll have to build a breakout harness for whatever wiring goes to it, then try to capture what will most likely be a serial datastream, and decode it. Would help to just take it apart first, get an idea of how many wires you're dealing with, and try to identify any controller chips running the LCD. You might just get lucky and it will be a standard LCD controller thats well-documented...
    MII-12000 / Ampie / Lilliput 7" / BU-355 / PicoPSU / uSDC
    Currently: Enjoying the setup, but always contemplating my next move...

  3. #3
    My Village Called 0l33l's Avatar
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    When I took apart the screen in my SC, there were so many pins running to it that I gave up, and decided to work on a workaround.
    So I'll just remember the last settings, and if somethign gets messed up, i'll have the ability to reset it.

  4. #4
    Variable Bitrate skippy911's Avatar
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    Well my current solution is to put it in a box behind the dash and shine a webcam on it so I can at least see the info, but yah ill rip it out later this week when I get my dash done and see what kinda chips im working with and whatnot. Thanks for the tips guys keep em coming

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    Were there enough pins to make one for each display segment (or enough for binary-coded digits?). Could be parallel, in which case it will be easy to read with a PIC.
    MII-12000 / Ampie / Lilliput 7" / BU-355 / PicoPSU / uSDC
    Currently: Enjoying the setup, but always contemplating my next move...

  6. #6
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by rsd212
    Were there enough pins to make one for each display segment (or enough for binary-coded digits?). Could be parallel, in which case it will be easy to read with a PIC.
    There are a lot of pins. The LCD... atleast in my car... is raised solely on those pins... there's at least 24 of them.

  7. #7
    Variable Bitrate
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    I think whats needed is a pic of the screen and a pic of the wiring. Of course from there it will be a lot of probing to reverse engineer it, then making an interface controller, then programming the PC side...not a trivial project, but shouldnt be that difficult either
    MII-12000 / Ampie / Lilliput 7" / BU-355 / PicoPSU / uSDC
    Currently: Enjoying the setup, but always contemplating my next move...

  8. #8
    Variable Bitrate skippy911's Avatar
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    I will try to remove the screen from my lexus tonight and post pictures. Any portion in particular which would be benifitial(sp)?

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    Variable Bitrate
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    Just a view of the front screen (if its a character LCD, try to get it so you can see both the on and off segments), then any connectors going to it.
    MII-12000 / Ampie / Lilliput 7" / BU-355 / PicoPSU / uSDC
    Currently: Enjoying the setup, but always contemplating my next move...

  10. #10
    Variable Bitrate skippy911's Avatar
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    Ok sounds good ill post them tonight when I get off work.

    EDIT: Been working on my screen fab and didnt want to take the car apart just yet. I will hopefully have some pics this weekend when I rip the entire lexus into peices fitting my mac mini in it

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