had this on my 2004 xt. looking in from under the release handle for boot/tailgate sprayed aload of wd40 got the handle loose by moving back and forth aload and when this had dripped for awhile sprayed aload of lithium grease onto the mechanism that you just about see from undeneath (above number plate), also paid attention to hinge/pivot for the handle. The issue with it not unlocking is due to this not being fully release the same happens if your pulling the door handle and unlock the car.