If I had that fault the first place I would look is at the back/top LH corner under the console to see if the wires to the XYZ switch were chafed and shorting.
There is a retainer for the wiring loom there which is right next to a protruding bolt and it would be easy for the loom to wear through and short.
You have to remove the console top to get to it easily and that requires drilling out 12 or so rivets.
It's a reasonably common reason for those types of errors , although it doesn't seem to occur all that often.
Regards Philip A


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