Hello,
It sounds like the multiplex control is out. I would start by checking the 6 fuses that run the multiplex controller. Here is a guide to help and the fuse location with the wiring diagrams so you can see which fuses to check:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Apr 7, 2021 at 1:19 PM