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Thread: question about ac/heating controls

  1. #1
    Maximum Bitrate customaudioman's Avatar
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    question about ac/heating controls

    I have dual climate control in my 2003 honda accord. Sine I have a carputer I no longer use the factory radio/cd player. I want to remove it from the center dash, problem is that the climate control are built into the head unit. Can I just remove the whole thing and use the fusion brain and display the temp on the vga screen? I want to be able to control it with out the ubit in the car. I know I have 8 buttons and two rotary knobs that control the climate control. Has anyone done this yet? if yes do you have pictures or links?

  2. #2
    Constant Bitrate
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    There are 2 directions you can take (in my opinion):

    Ideal for newer more complicated HVAC systems
    1. Retain your original climate controller and just tap the signals off the rotary dials and buttons and connect them to the Fusion Brain. This way you will retain all your factory climate features, and with a bit of logic you should be able to work out the temp from the position of the rotary dials so you can display it. Though you will just have to relocate you original climate unit and add a bit of interface hardware.

    Good for older simpler HVAC systems
    2. Remove the climate controller completely and add some temp sensors to the Fusion Brain. This way you can make up you own algorithm to control your temp, then you have complete control over the blower and temp. This method requires much more hardware interfacing.

    Have a look at h3rk posts, he has done a huge amount of work on this subject and you should get some ideas from this guy.

  3. #3
    Maximum Bitrate customaudioman's Avatar
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    Quote Originally Posted by Civic Modz View Post
    There are 2 directions you can take (in my opinion):

    Ideal for newer more complicated HVAC systems
    1. Retain your original climate controller and just tap the signals off the rotary dials and buttons and connect them to the Fusion Brain. This way you will retain all your factory climate features, and with a bit of logic you should be able to work out the temp from the position of the rotary dials so you can display it. Though you will just have to relocate you original climate unit and add a bit of interface hardware.

    Good for older simpler HVAC systems
    2. Remove the climate controller completely and add some temp sensors to the Fusion Brain. This way you can make up you own algorithm to control your temp, then you have complete control over the blower and temp. This method requires much more hardware interfacing.

    Have a look at h3rk posts, he has done a huge amount of work on this subject and you should get some ideas from this guy.
    well the problems is the ac/headunit is all one large part. I dont know where I can relocate it to. If look at my avatar you see the picture of the built in ac/headunit, it the whole center part

  4. #4
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    Maybe you could open the whole thing up and you might find that the climate unit is a small module inside the head unit. I doubt that the circuitry for the head unit will be intergrated with climate system. Pull it apart and you should be able to tell.

  5. #5
    Maximum Bitrate customaudioman's Avatar
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    Quote Originally Posted by Civic Modz View Post
    Maybe you could open the whole thing up and you might find that the climate unit is a small module inside the head unit. I doubt that the circuitry for the head unit will be intergrated with climate system. Pull it apart and you should be able to tell.
    actually I had the whole thing apart when I painted. The size of the whole radio system/ac climate control which is a cpu board, is the same size of the whole thing. That the reason I have never seen anyone do it for honda accord 03-07

  6. #6
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    Hmm, maybe I was wrong then. I was looking at this:
    03-05 Accord 7" Mold

    and I think that green plug in the pic goes to your climate controls cos in my civic its looks like the same plug. If you have a schematic of the electronics of the climate and/or radio post or PM it, and i will look at it. If there similar you might be in luck.

    **ADDED, goto second last post of the above thread and there is a link with pics on what some guy did and relocated his climate.. This should solve your problem.

  7. #7
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by customaudioman View Post
    actually I had the whole thing apart when I painted. The size of the whole radio system/ac climate control which is a cpu board, is the same size of the whole thing. That the reason I have never seen anyone do it for honda accord 03-07
    You can't find anywhere to stash the thing and extend the wires? I know in my civic, there are huge cavities in the dash and centre console so the curvy plastic looks nice.
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

  8. #8
    Maximum Bitrate customaudioman's Avatar
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    I dont thinks so. If I want to keep the plastic on the front trim. you have take it completely apart, a pain

  9. #9
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    So I take it you want to completely remove the climate control unit including the dials right, and have the FB control everything?? If this is the case then yes the FB can do it, though you will have to know where all your vent controls are in order to control them, then just have an external temp sensor or use the factory one. Then you have to control the blower motor. So yes there is a bit a work ahead of you if this is what you want to do. If you really need help post a diagram of your climate system if you can find one.

  10. #10
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    Buy the Metra aftermarket radio dash kit and it has an "aftermarket" heater control to go along with new radio. cut out the radio housing and wire up the heater control. now smaller to stash somewhere nice

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