Key fob signal receiver
 

I am trying to locate the antennae or receiver that controls the unlatch solenoid for the tailgate/hatch on an 02 c320 wagon. When activating the fob to unlock the vehicle all the door locks work. However, the hatch does not unlatch. I am getting no voltage to the unlock/unlatch solenoid on the wagon door. All fuses and relays check out excepting that i cannot locate the relay for the hatch itself. Unsure as to whether it uses the same relays that the other 4 doors use. 2 local Mercedes wizards cant figure it out as well. Can anyone here offer some advice? Thanks