Trunk does not open even after hearing the click:
A trunk lock actuator makes a distinct "clicking" sound when it is activated. One of the major issues that can occur with this device is that the motor will work, but the locking mechanism does not. A locking mechanism has multiple components inside the actuator; one of which is a linkage system that manually moves the lock to the open position when the actuator is activated. Occasionally the linkage may become damaged, or the electronic wire that is attached to linkage might come loose. If you notice that the trunk lock does not spring open when you press the fob remote or the button inside your vehicle's cab.
Manual locking mechanism works fine:
If you try to unlock the trunk with the fob or switch in your car and it doesn't work, but the manual lock works fine, this is a clear cut signal that your trunk lock actuator is broken.
Disconnecting the old trunk lock actuator:
Step 1: Access the trunk and locate the trunk lock actuator. Chances are if you need to replace this part, then one or more of the normal methods of popping the trunk are not functioning. If your vehicle was produced in 2002 or later, you can always manually open the trunk with the emergency release lever.
Step 2: Remove the plastic cover and the trunk liner. The plastic cover on the trunk lock actuator will pop off with a slight amount of prying along the edge. This can usually be done by hand, but if you are having trouble, use a flathead screwdriver or a trim panel removal tool.
Step 3: Remove the actuator cables and any electrical connectors. The cables will slide out of a locating bracket or guide, and the ball end of the cable will push aside and out of its seat to free the cable from the actuator assembly.
connecting the new trunk lock actuator:
Step 1: Mount the new trunk lock actuator. Starting with the electrical connector if your actuator is equipped with one, begin reconnecting the trunk lock actuator. Slide the connector over the tab on the actuator and gently push until it clicks into place.
Step 2: Reconnect the trunk lock actuator cables. To reconnect the actuator cables, you will place the ball end of the cable into its seat before placing the cable retainer into the guide bracket of the actuator itself. You may need to manually press back on the spring-loaded latch to get both the ball end and the retainer into the proper position.
Step 3: Reinstall the trunk liner and trunk lock actuator cover. Reinstall the trunk liner by lining up the connectors to the appropriate holes on the trunk door and press firmly on each connector until it snaps into place.