How to Add Automatic Temperature Control (ATC) to a Manual Temperature Control Truck

Discussion in '4th Gen DIY' started by DeereGuy, May 16, 2017.

  1. DeereGuy

    DeereGuy Preferred Vendor

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    MPGrimm and I have been working on figuring out how to convert our trucks from manual temperature control to automatic temperature control. We have made enough progress to prove that it can be done and want to share what we have learned with everyone.

    This is a pretty easy and inexpensive mod in terms of parts. You basically need to buy a cabin temperature sensor, a connector, and some terminals and put it all together using an existing 8.4 conversion harness. The trouble with this mod, is that the feature has to be activated in the BCM. I used my AutoEngenuity tool to activate the feature, but unlike activating some other features where it was a smooth process, this caused corruption of my trucks “vehicle brand” which caused the 8.4 Radio to loose it logo and themes. I have not found a way to correctly reset the brand. If you have the AE tool, and want to try this mod, please be aware of this issue. I have not encountered any other problems with the truck due to this issue, but proceed at your own risk.


    Anyways onto the mod:


    Parts Needed:

    (1) 55111178AC – CABIN AIR TEMPERATURE SENSOR
    (1) 1-929170-4 – 4 WAY Connector Shell for Temperature Sensor
    (4) 963715-1 – Female Terminals for 1-929170-4 (Temperature Sensor Connector)
    (2) 1123343-1 – Female Terminals for 1318917 (HVAC Module Connector


    Conversion Harness Modification

    You will need to pin two new wires into pins 11 and 12 of the HVAC module side conector of the conversion harness. These wires will run from the HVAC module to behind the drivers side kick panel where the Cabing Air Temperature Sensor will be located (more on that below). I made my wires 80" in length. You will also need to splice wire # 2 for fused ignition power and wire #14 for ground. These will run to a new connector for the temperature sensor (1-929170-4). The following schematic shows how to wire it up.

    [​IMG]IMG_0083 by Deere Guy, on Flickr

    Here's what my conversion harness looked ike after adding the temperature sensor wiring. Notice the new leg off of the harness. It is shown with the sensor attached.

    [​IMG]IMG_0812 by Deere Guy, on Flickr


    Installing the Temperature Sensor

    The temperature sensor is located behind the driver side knee kick panel. You will need to remove the panel and install the sensor.

    1. Remove the two screws at the bottom of the panel and then pull the panel off.
    [​IMG]IMG_0809 by Deere Guy, on Flickr

    2. Install the sensor.
    [​IMG]IMG_0811 by Deere Guy, on Flickr

    3. Route the new leg of the conversion harness over to the sensor and plug it in.

    [​IMG]IMG_0084 by Deere Guy, on Flickr

    4. Reinstall the knee kick panel.


    Activating with AutoEngenuity

    Note: Do this at your own risk. I am not responsible for anything that may happen to your truck as a result from performing this modification.

    1. Connect the AE tool to the truck.
    2. After selecting the truck, connect to the Body Control Module.
    3. Select the "Test Onboard Systems" tab
    4. Select Module Configuration from the drop down.
    5 . Select "Initiate"
    6. Accept the warning message.
    7. Using the arrows on each side of the done button, scroll down to "vehicle config 3".
    8. Press Done.
    9. Using the arrow buttons select" HVAC Config" press Done.
    10. Using the arrow buttons select "Dual Zone ATC" and select Done.
    11. Wait for the write to complete.
    12. Reboot the radio by pressing both knobs simultaneously for a few seconds.
    13. Repeat the above process but this time select "Single Zone ATC"
    14. Reboot the radio again.


    As you can see in the picture below, I have mine set for a single zone automatic temperature control. I am using a standard MTC bezel, and just using the "Auto" button on the radio to switch it into Automatic mode.

    [​IMG]IMG_0813 by Deere Guy, on Flickr
     
    Last edited: Sep 18, 2017
    Stefan N, Hemi395, 69mach1 and 8 others like this.
  2. Tim7139

    Tim7139 Senior Member

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    OMG I'm so excited I peed a little.
     
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  3. Mpgrimm2

    Mpgrimm2 Preferred Vendor

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    Glad we could finally put this out there. More to come!

    -------------------- Edit -------------------
    -------------------- Edit 2 -------------------

    Well, I have successfully pulled off a single Zone ATC bezel mod after about 8 hrs of work and repairing a partially damaged board. Very difficult to do without a $1000+ SMD repair station, but it can be done.

    I would give this a 9 or 10 on the difficulty scale because of the small size of the components/traces.
    (I ruined the LED's on a single zone MTC board 'practicing' for this, which is very easy to do)

    Big thanks to 00R/T for the idea and some great notes/pointers to pull it off!

    [​IMG]

    ----------- Items needed --------------

    - Dual Zone ATC bezel
    [​IMG]

    - Single Zone MTC button assy
    (discard the rest of the MTC bezel)
    [​IMG]

    - 28awg annealed magnet wire
    - (1) 20k ohm 0603 SMD resistor
    - small soldering stuff: 3x-4x jeweler's magnifying headset, ESD mat/strap, hot tweezers, Variable temp soldering iron with smallest tip (ie Weller wes51 & ET0 1/32" tip), regular tweezers, etc.

    - Patience! Lots of patience!

    ** Additional details in Post 8 **
    http://www.ramforum.com/showthread.php?p=1515524


    M² Mods - From my non Flammable S7!
     
    Last edited: Aug 3, 2017
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  4. Dodgetk81

    Dodgetk81 Senior Member

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    Nice job!
     
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  5. jcarden10

    jcarden10 Senior Member

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    Would you mind adding the exact steps/place to modify the BCM with the AE tool?

    Also, have you guys looked into a fully functional dual zone ATC or is that part of the "more to come"?

    Great work by the way!


    Sent from my iPhone using Tapatalk
     
  6. R.L.K.

    R.L.K. Supporting Member

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    This is really cool guys !

    Congrats to M2Mods!

    Sent from my SM-G900V using Tapatalk
     
  7. CuylerTech

    CuylerTech Senior Member

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    Good job guys. We had this running a couple months ago ;). OOR/T got creative and combined the two bezels so he has the auto button with one set of temp controls.


    Sent from my iPhone using Tapatalk
     
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  8. Mpgrimm2

    Mpgrimm2 Preferred Vendor

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    ----- Post edited for bezel mod ----

    As a basic overview, your have to cut some traces on the ATC board, remap the buttons with 28awg magnet wire, and switch the left side LEDs (red vs blue) and their current limiting resistors. Plus use the button assy from a single zone...
    [​IMG]

    Here's some pictures:

    Before:
    [​IMG]
    [​IMG]

    After:
    [​IMG]
    [​IMG]

    Final:
    [​IMG]

    M² Mods - From my non Flammable S7!
     
    Last edited: Nov 1, 2017
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  9. stimpy433

    stimpy433 Senior Member

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    Great work guys!!!!
     
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  10. DeereGuy

    DeereGuy Preferred Vendor

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    I updated the original post with the AE steps.
     
    Last edited: May 17, 2017
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