Mike,
You need to make 1 more check to verify the card has positive and negative supplied to it.
The pcz plug is the far right plug on the card with multiple colored wires. The white wire is positive input and the brown wire is negative.
If those are present, then you can assume the card is inoperative due to no output for the potentiometer con TB11-1.
There can still be a switch input issue on TB11- 2, 5 &6.
That is why I asked for the checks on TB11 1 thru 6 while requesting fwd travel to verify the potentiometer circuit, the seat, brake, accelerator switch, and f/r inputs are correct.
Keyed on voltages do not verify their potential to go to bv when requested