In USA forums they say that the locker solonoids are the two little black boxes hanging beside the battery on the passenger side. They say that each solonoid has a purple wire and 3 yellow wires. The front locker should have a purple with blue line and the rear locker should have a purple with a green line. Im my european JK 2,8CRD 130kW/177PS the colors don't match.
https://photos.app.goo.gl/vcenQsSoGwTXGHzR8
Since you guy have the 2,8CRD do you know if the right locker solenoids are still near the battery but with different wires colors ?
https://photos.app.goo.gl/L6T79d5gi5tUPzng8