HVAC and heated seat controls not working

Unfortunately they are not wrong that these systems called the "Cue" system has given a lot of trouble. A lot of issues of screens freezing and loss of control. So we need to clarify what was replaced when you say the stake unit was replaced. The HVAC control module and display screen are different so do you have a part number of the part replaced?

Have you tried a reset on the system? You do this by turning the vehicle on. Sliding your finger on the bottom of the screen/storage area to open the lower panel. Leave it open and turn off the vehicle and then open the driver door for at least 30 seconds to 60 seconds. Time it using your phone and make sure you get past the 30 second mark. Once you are close the driver door and turn the vehicle back on, then close the storage unit and the head unit should show Cue in the screen and basically rebooted. If this does not work then I suspect the HVAC control module or possibly the BCM is the issue depending on what the part number is of what they replaced.

Let me know and we can go from there. Thanks

That HVAC control module is behind the radio in the dash. However, I may have missed the heated seat issue as well. That has a separate module that controls these. It is the heated seat control module. Take a look at the last attachment where it talks about this operation. The only thing in common with all this is the radio/hvac controls. This is why we need to get the part number of what was replaced so we can see what the actual part is.

Can you get a quick video of the issue? Clearly it is highly unlikely that the second radio has the same issue as the first but based on what you are telling me, it is the touchscreen/radio as the issue. So maybe I am not understanding the issue as I think I am.

Unfortunately these radio's had all sorts of issues so where did you get the unit? Was it used or new from a dealer?

Okay. I was going to send the video to one of my GM dealers for their input because a video is much more clear then us describing it but that is pretty clear.

One clarification point, the way I understand you saying control panel is the bottom portion (circled in red in the attached) and not the touch screen, correct? Does the touch screen operate properly?

I am waiting to hear back from a dealer but while we wait, let's just check the HVAC control module fuse in the center console fuse panel. I attached the info on where this is.

I will report back as soon as I hear from them. Thanks

So I got word back from a dealer and they stated that they see this issue enough to know what I was talking about and replacing the unit that you replaced has solved it. Which makes this even more odd. So I asked what else could cause this and he said that the only thing these items have in common is the touch screen however, if that is operating then the touch buttons (circled buttons in that picture I sent) are just inputs to all the various modules that they interact with.

Then he said something that was interesting and that I have first hand experience with a different OEM. These units that are sold are "re-manufactured" units and the "new" units that have never been installed in vehicles are held for new production units. That means when someone replaces this unit at a dealer, they send back the old one, the supplier tests it and if it tests okay, they resell it. He told me that they have replaced these units for an issue and when they install the replacement they have different issues. In fact, the last time they had the issue you are having was with a replacement unit.

Clearly this is unlikely for you to get two units that are doing the exact same thing, but with this info it is possible.

Let's check the fuse for the power to the HVAC module as I posted before and then we will may need to consult a dealer and have them monitor the HVAC module to see if they can see the button being pressed on the display. If they are not able to see the button being pressed in the module then I would think it is this same unit again. However, if the HVAC shows the button being pressed but it is not doing anything then that module would be the issue.

Sorry I don't have a better answer for you but I am hoping that fuse is blown. Let me know. Thanks

Unfortunately they did not respond but that doesn't mean we can't figure out what is going on with your system.

Have you replaced it as they have and still have the same non response? Also, I just want to make sure it is the same buttons not working as listed above?

Can you get a video of what you are dealing with? There are all sorts of complaints with this system. So if you have not been to the dealer for any and all software updates, that may be needed as I am sure they have made some improvements. In fact, I think there is a class action lawsuit on these units.

There is a logic module inside the instrument cluster, also a HVAC module, front seat control module and the PCM is involved, I would do a CAN scan which is easy and goes over the entire car to see what's wrong. You can get a CAN scanner from Amazon for about $30.00.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here is a scanner link:

https://amzn.to/3o41KcZ

Also recheck all fuses with the key on and let us know what the scan comes back with.