Touch Pad not working - How is it connected

Hello,

After disassembly and assembly forPC cleaning (I do not remove any components, I only disconnect the three ribbons connecting the keyboard) the touch pad of my ASUS R510 JK is not working and I am trying to fix it. I saw in the tutoriol "Asus X551CA Touch Pad Replacement" (Asus X551CA Touch Pad Replacement) that the three ribbons (and their positions) connecting the keyboard plate cover to the bottom cover are quite the same as the R510JK ones. Can someone tells me which one (or ones) is (are) related to the Touch Pad ?

When I do the inventory of the hardware components, the Touch Pad is not detected. Do you have an idea of what could be the problem ?

Thanks for your support.

regards.