Liftgate and window lock?

My keyless remote will lock and unlock all the doors except the liftgate. I'm sure it is some type of relay or solenoid but is there something else that any of you have experienced. All other locks, unlock/lock just fine. Also, if you may know the part # please let me know. I've got a crash book but can't find a number of what I think it may be. Thanks for the help.

Look here for the lock unit for the liftgate:


http://www.mazdawholesaleparts.com/

http://www.partswebsite.com/mazdawholesaleparts/?i=1&model=1562&make=136&year=2001&section=141&catid=30195&subcatid=34566&partid=0&type=parts&image=5325550&imagecallout=0


$158 for the power locks handle/lock unit.
You might want to check the connection first. Also check for power and ground there.