That is the actuator for the trunk onlythere is another part that is the module /pump for the locksand trunk. I've sent a picture of all the components. There are two of the control unit which is in the center of the car. However there are micro switches and other things that have to be adjusted properly and I would not reccomend you doing this as I dont' know your skill level. This is something better left to the pros to do.
Images (Click to enlarge)
Saturday, October 8th, 2011 AT 10:44 PM