I'm trying once again to get card readers working for my IDv3 in Crazy Taxi upright cabs. The game itself is working fine. From there, here's what I did:
Added in sub-harness (pink and blue) to allow power to go to the card reader power supply (purchased from Europe - could voltages differences be my problem?)

Made connections to the card reader itself

And to CN8 on the motherboard.

Here's the error message I get

Is there anything else I'm missing? I've been trying for the better part of a year to make this work; now that I've got basically all parts from a friend's machine (aside from the card reader power supplies), I can't imagine what's wrong.