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

DeereGuy

Senior Member
Preferred Vendor
Supporting Member
Joined
Nov 9, 2016
Posts
623
Reaction score
565
Location
Pittsburgh, PA
Ram Year
2016
Engine
6.7 Cummins
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.

36917098150_6718fab230_b.jpgIMG_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.

35706977336_29880ce55d_k.jpgIMG_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.
35706977236_108e5ae796_k.jpgIMG_0809 by Deere Guy, on Flickr

2. Install the sensor.
35706977276_4b5d432641_k.jpgIMG_0811 by Deere Guy, on Flickr

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

36917229710_616ff2793d_b.jpgIMG_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.

35706977346_fb21946f05_k.jpgIMG_0813 by Deere Guy, on Flickr
 
Last edited:

Mpgrimm2

Senior Member
Preferred Vendor
Military
Joined
Mar 30, 2014
Posts
5,753
Reaction score
3,801
Location
Anderson, SC
Ram Year
2019 Laramie QC (5th Gen)
Engine
5.7L eTorque
Glad we could finally put this out there. More to come!

***** Update *****

14-18 Ram 1500's Require the additional Humidity Sensor & wiring up to the mirror area to get Single Zone ATC to function correctly (discussed by Deereguy here).

We now offer a 2 part version 2 harness set to add the extra humidity sensor with ATC for the 1500's. See our M² Mods thread . or contact us via pm.

- 13-18 RAM ATC Conversion Instructions v2 10-28-18.pdf

f5111c70e4f2e18499e0a4a94bbc6e95.jpg

- Humidity Sensor (2014-2018): 55111389AF
- Sensor Cover (2014-2018): 1SU12DX9AA (not really needed. See install).

You can see @sawz install at post 555.


-------- Update on AlfaOBD Programming --------

From the AlfaOBD Thread OP for " Known working codes" Link...


NOTE : Battery disconnect or pulling the 20A inline radio fuse near the brake booster for 1-2 mins (Pass Side firewall on Dual Batt. Trucks) ... between these changes can speed up the radio/BCM reset for changes, especially with a UAQ/UAS radio (think 15-30mins).

* Radio is not reset until SXM button displays again and/or Backup Cam works if installed)

* your original config would be "Single Zone MTC"


To Begin...

With key in 'RUN' (engine off)
....Connect to BCM -> go to "raised hood" icon -> Car Configuration Change )


Vehicle Configuration 3 ->> HVAC Configuration:
Select:
Dual Zone ATC

Disconnect AlfaOBD app & shut off the truck for a few minutes and pull the 20A inline Radio fuse for 1-2 mins to force radio reset. You must wait for the Dual Temp sliders to display on the 8.4 radio before proceeding with single zone ATC change. (wait for SXM Button/BuCam to show up again)


....Connect to BCM -> go to "raised hood" icon -> Car Configuration Change )

Vehicle Configuration 3 ->> HVAC Configuration:
Select:
Single Zone ATC

Disconnect AlfaOBD app & shut off the truck for a few minutes and pull the 20A inline Radio fuse for 1-2 mins to force radio reset. You must wait for the Single Temp slider with Temp Setting to display on the 8.4 radio before proceeding any other changes. (wait for SXM Button/BuCam to show up again)

DONE

-----------------------------------------


------ (ONLY AS NEEDED TO START OVER) ---------
TO RESET YOUR HVAC Configuration Back to Original

With key in 'RUN' (engine off)
....Connect to BCM -> go to "raised hood" icon -> Car Configuration Change )

Vehicle Configuration 3 ->> HVAC Configuration:
Select:
Single Zone MTC

Then disconnect AlfaOBD, Shudown the truck, let it go to sleep… and pull the 20A inline Radio fuse near the brake booster at the firewall (2 minutes) to force a radio reset.


Next… Get back in and switch the truck to “run” without starting. Wait for RADIO to reset… it’s done when the SXM button appears and the Backup Camera works again.

Check the HVAC on screen menu… it should show the old Single Zone temp slider without the temp readout . (now your back to original config).

------------------------------------------------------------

Additional how to videos by @big daddys house AlfaOBD: Full Video Tutorals (Step By Step).

M² Mods Intro & Project List.
 
Last edited:

jcarden10

Senior Member
Joined
Feb 17, 2016
Posts
201
Reaction score
86
Location
Raleigh, NC
Ram Year
2014 Big Horn
Engine
Hemi 5.7
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
 

R.L.K.

Senior Member
Supporting Member
Joined
Dec 1, 2013
Posts
12,803
Reaction score
12,487
Location
Bristol , Tn.
Ram Year
2014 4X4 QC Express 6 speed auto 355 differentials
Engine
5.7 Hemi
This is really cool guys !

Congrats to M2Mods!

Sent from my SM-G900V using Tapatalk
 

CuylerTech

Senior Member
Joined
Nov 30, 2013
Posts
3,633
Reaction score
960
Location
NH
Ram Year
2015 Big Horn Mega Cab 4x4
Engine
6.7L
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
 

Mpgrimm2

Senior Member
Preferred Vendor
Military
Joined
Mar 30, 2014
Posts
5,753
Reaction score
3,801
Location
Anderson, SC
Ram Year
2019 Laramie QC (5th Gen)
Engine
5.7L eTorque
-------------------- Edit -------------------

I was thinking about grabbing an extra dual zone bezel if i can nab one for cheap to try and combine parts between them.

I will pm Steve to see what he did vs starting blind since we were apparently thinking the same thing. I would love to see the look on the dealer tech's face during my next oil change if they saw a single zone ATC bezel. "sha wing!"

-------------------- 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 Steve for the idea and some pointers to pull it off!

3010f68f9bc31189269806ed87c0b066.jpg

*Contact me by PM or see our M² Mods thread for pricing to get one if interested *


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

- Dual Zone ATC bezel
6a61f89c975e35a9edaa0a7f8f5dddf1.jpg

- Single Zone MTC button assy
(discard the rest of the MTC bezel)
0367da44e690a75ee6e19ee4ee9e0cde.jpg

- 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!



----- Overview ----

As a basic overview, your have to cut some traces on the ATC board, remap the buttons with 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...
6662f59625f8d6a7358f86ca9d7d6fcf.jpg

Here's some pictures:

Before:
9b79af9b95f579b57f4f028693b32960.jpg
9a10e4b8ea583e95ca130cc8594d7c34.jpg

After:
338bee49e5e7a049cfadc89157e287b2.jpg
7732972743e30f7c08d1c4f53f00f8fd.jpg

Final:
9f4b308038ffac55312f5d5d0ab81bde.jpg

M² Mods - From my non Flammable S7!
 
Last edited:
OP
OP
DeereGuy

DeereGuy

Senior Member
Preferred Vendor
Supporting Member
Joined
Nov 9, 2016
Posts
623
Reaction score
565
Location
Pittsburgh, PA
Ram Year
2016
Engine
6.7 Cummins
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



I updated the original post with the AE steps.
 
Last edited:
Top