If the power door locks are buzzing or are intermittently noisy, a new door latch assembly may solve this. The door lock actuators are integrated into the latch assemblies.Google+
Car Problem Reports
Jeep Liberty New Latch Assembly Will Solve Noisy Power Door Locks
Jeep Liberty Problem
Average Mileage: 85,817 mi (10,010 mi - 195,000 mi)
Visitor, 2010 Jeep Liberty, 35,000 mi
Door Locks stopped working on both Driver and passenger side of Vehicle.
Visitor, 2010 Jeep Liberty, 52,000 mi
passenger rear door lock failed.
Visitor, 2007 Jeep Liberty, 63,000 mi
For the past couple of weeks I've noticed a "clicking" sound when opening my door after the lock was engaged. Today, the lock on the driver's side door is making a "buzzing" sound. How do I fix this?
Visitor, 2009 Jeep Liberty, 67,128 mi
Power door locks in the front of the vehicle (passenger and driver sides) started making a humming type of noise and short thereafter, stopped powering up and down both front door locks.
Visitor, 2003 Jeep Liberty, 103,000 mi
buzzing sound when locking door
Visitor, 2009 Jeep Liberty, 80,000 mi
Rear right passenger door will not lock or unlock via power control.
Visitor, 2002 Jeep Liberty, 134,000 mi
When locking and unlocking the doors there is a buzzing sound and the passenger rear door will not look or unlock.
Visitor, 2004 Jeep Liberty, 90,900 mi
driver side door latch and key entry problem
Visitor, 2003 Jeep Liberty
Loud buzzing when doors auto-locked. Replaced latch assembly myself, but was not easy.
Visitor, 2010 Jeep Liberty, 51,000 mi
Front passenger door lock will not lock or unlock.