[CanadianBacon]

The 7 pin harness is availble, atleast in Canada. I just installed it. The pre-wired harness isn't where you think it would be. You have to remove the trunk tray, then loosen a side luggage panel, and it's tucked under there. Looks the same as other years, just in a way different spot. The kit also comes with a brake controller harness for the dash.

The pre wired harness is the little white thing in the top right of the pic. Located tucked under that panel. No wonder no one can find it. The control module the kit comes with is on the left.

 

[CanadianBacon]

And did you just take out the screws under the covers to remove it, or is there some kind of trick?

Once you take the screws out you have to use a touch of force to get it up as there are still retention clips holding it. Just use the cover and pull up on it and it will pop out.
Here’s the part number

 

[CanadianBacon]

It looks the wires plug into the module. Is that how you were able to fish them through the grommet? Even though the older ones may work because of how they are made you would have to leave the module out in the old place and just fish the plug up into the compartment. That is assuming they did not do something different in the module for the 23.

The older wiring harnesses won't work because the plug is different. The one on the 2023 looks like the pic below.

And here's the one for previous models. They aren't compatible.

 

[CanadianBacon]

What dealer did you get the part from. Not sure I can get it in the USA and may have to order from them and have shipped. Bummer

O'Regan's Hyundai in Dartmouth, Nova Scotia. I just called the parts department and asked for a 7 pin harness for the 2023 Palisade. I didn't even know what the part number was until I picked up the part. I'm very surprised Hyundai Canada would have it and Hyundai USA wouldn't. Doesn't make much sense.