When this happened to me it was after I was cleaning under the seat. Some googling around pointed to me knocking a wire loose under the seat. I made sure the connections were all tight then followed this procedure to realign the extents on the sensors. Basically, the sensor lost track of where the seat was. Moving the seat all the way forward and back several times did the trick. Good luck
255/75-17 BF Goodrich Mud Terrain TA KMs, 2" lift, JK Wrangler Moab wheels, Spidertrax Spacers, Rola Roof Rack.