I just recently noticed on my 2000 Cherokee classic if you hit the lock or unlock button it locks or unlocks all doors but driver door and passenger rear door. I'm stuck any help is appreciated Butch

 

I just got a 99 Cherokee Sport and I have the exact same problem. When you use the power lock buttons, you can hear the driver door and rear passenger door locks 'spinning' is sort of what it sounds like. I fear the fix to the problem is buying a new lock mechanism or maybe a new lock actuator, although I'm not really sure. For my jeep it sometimes will work, but most of the time it just makes the whirrrring noise and does nothing.

 

Mine will sound like it locks but its like something is preventing it from locking fully. The jeep didn't come with s key fob so Idk.