Yes . It is for Xc90.
I've tried the continuity by wiggling wires.
Look like that switch control knob circuit problem.
Just found out turning on and off the knob also affects the intermittent fail. But then CAN bus diagnosis, Iam not expert.
I might need some expert advise like you, SwissXC90 and experienced members, if tomorrow's knob replacement didn't work.
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Thank you again....