My 3rd row seat will not go down, we checked all the fuse's they are all ok, there is no BEEP either when we press the button, I saw that I might have to replace the motor, how do you remove the panels in the rear to get to it?

 

Hyundai issued an official Technical Service Bulletin (TSB 22-BE-001H) specifically for 3rd-row power seats that stop working with no beep. https://static.nhtsa.gov/odi/tsbs/20...10202-0001.pdf