8.4" to 12.1" screen replacement

[kolian2012]

Hey guys i yave a 2024 ram 2500 tradesman with one zone climate and manual knob. did this swap and everything went great everything works other then hvac and Android auto says (pre production hardware not for resale)
I programed the body control module cabin net ics -no and cabin net dcsd yes and hvac controls are fully grayed out and nothing works other than rear defroster. If I program cabin ics to yes hvac is stuck at fan speed 4 and I can't adjust.
I tried factory reset of the head unit and nothing changes. Wondering what I am missing.

 

[alliss00]

I’m new to the forum and was looking for help with 8.4-12.1 swap. My situation is I have a 2024 Big Horn with a 12.1 screen. My son has a 2019 Big Horn with the non navigation 8.4. We’d like to swap them. The pickups are near identical so the trim would be fine. How much extra is needed to be purchased to make this possible since I could take whatever needed from each pickup. Thanks.

 

[kolian2012]

I’m new to the forum and was looking for help with 8.4-12.1 swap. My situation is I have a 2024 Big Horn with a 12.1 screen. My son has a 2019 Big Horn with the non navigation 8.4. We’d like to swap them. The pickups are near identical so the trim would be fine. How much extra is needed to be purchased to make this possible since I could take whatever needed from each pickup. Thanks.

You will need an hvac harness or re-pin the oem one and cut the tab on the original or pull all the pins from your bighorn and the male adaptor to fit the 12in screen and you will take the display wire and radio module from your bighorn With the 12 inch screen. Then you will need to program using alpha obd or similar.

 

[gustov_romanov]

Lol, sorry guys. I thought I was replying in the 5” to 8.4” thread. Like Brookelf said, you’ll have to install the cabin temp sensor and correct sun sensor to get close. Let me know if you need a plug n play temp sensor harness, I have a few made up. Your current sun sensor connector already has the correct wires for the ATC sun sensor.

Do you still sell this wiring harness? If not, where can I buy the connectors?

 

[kolian2012]

Hey wanting to install a sub to the 12 inch screen. Not sure where to post this but does anyone have the wiring digram from the back of the head unit to show which wires are positive and negative to what speakers? If wrong section to post this in i can delete.

 

[msnyder1112]

I did the 8.4 non nav to the 12 Uc5 and everything works great except for one minor thing.

I saw someone asked about it but no one ever acknowledged him.

My 8.4 non nav had the ability to zoom into the hitch on the backup cam. I don’t have that option now.
Anyone have any ideas?

 

[TheWaterman83]

I've read this a few times, but it seems to continuously evolve:

2019 Ram Rebel with 8.4" Uconnect 4, WITH NAV. I am being told if I find a 12" Uconnect 4, it's plug and play? No radio module needed?

 

[MannyN]

I've read this a few times, but it seems to continuously evolve:

2019 Ram Rebel with 8.4" Uconnect 4, WITH NAV. I am being told if I find a 12" Uconnect 4, it's plug and play? No radio module needed?

You need a new radio module to accommodate the big screen. You need to re pin the power connector and replace the LVDS cable. Then reprogram with AlfaOBD or J-Scan.