Steering coupler? Can you please expand on that? So, there is a smart junction box that powers these items I would start by checking for power at the fuses.
Here is a guide that will help:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
The fuses you should check are in the images below. If no power is present when the key is on, then the SJB needs to be replaced which I have left instruction for. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
Images (Click to make bigger)
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Thursday, March 23rd, 2023 AT 9:06 AM