Thanks for the looking at the SR.
Unfortunately there is no possibility to do a loop-back test. The inputs are routed to a special 0.2 mm pitch flex connector and I only have custom flex ridged sensor PCB's that connect to it.
Can you tell me witch pins you thing are the issue?
As the generic steps for debugging is provided in the SR, let me know you required any additional steps for debugging or you can provide the latest update about the case.