Do you by chance have another corner post to display harness ? I worked on a 9320 for three days , replaced the steering controller , checked all wiring, nothing, after exhausting everything I asked the owner if he had switched the monitors between tractors, he said he does, he brought me the monitor and corner post harness and that worked, the steering wheel appeared and the AT worked, I switched the monitors around and it still worked , it was the corner post harness that was the issue.