I just bought my '12 JKUR late last week and tried out the lockers this weekend to make sure they worked. I went into 4 low, then hit the locker button once for the rear to engage which it did with no problem, then I hit the button again for the front to engage which it did with no problem, then I hit the top of the button once to disengage the front locker. The front disengaged, but then I decided to try to put it into 2 wheel high without disengaging to see if the computer would automatically disengage it for me. In 2 high it stayed locked, so I accelerated to about 20 mph to see if it would unlock but it didn't. I think made some gentle turns to see if it truly was locked or if it was just the light sticking on. Sure enough, it stayed locked! I hit the top of the button one last time and it unlocked, so I either stumbled upon a glitch or it was modified by the prior owner to behave that way.