Code 542 sets when you cycle brakes or seat presence switch. Followed steps in manual, checking key wiring, fuses, all checked good. Swapped contactor, didn't fix issue, swapped access 5 with known good and it fixed the issue on the trouble truck; so in turn I took the bad access 5 and put it on the good truck and it worked fine, so something else is going on.
Any ideas?
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