How to detect to which pin connected the sensor?

Question

I have PIR sensor and MBOX306GS control board with Android. This board has I/O Control Interface with 4 GPIO. I found 91 available pins using command cat /sys/kernel/debug/gpio. Then I activated them and tried to read values but with no luck. I've tested this sensor on Orange PI and it worked good. But for this board I can't find the right pin to connect. Does anyone know how to detect to which pin my sensor connected in Linux, so I could read value changes using command cat /sys/class/gpio/gpio(here is gpio number)/value Here is image of this board (back) and GPIO section

Answer 1

Finally find pins that I can detect. There are LVDS pins (70-89) that I can use.