HI there

We have a Jungheinrich EFG with the 3 MP1514 controllers in the back. We have a truck where the one motor drives in forward whilst the other drives in reverse. The hydraulics work, but we have not steer. We have tried a different steer sensor but still the same problem, also changed the MP1514 unit. I think i might have a break in the wiring from the steer sensor to the interface card, but in my wiring diagram that i have, it does not match the interface card wiring on the truck.
Can anyone shed some light where the wires should go back to? as my diagram states it should go back to connector X5 on the interface card. I have tried the truck length options as this can sometimes prevent steer from operating. I originally had error 27 but now my errors have gone but just not working.

Any help would be greatly appreciated.

Regards