Were is the remote door lock relay control located in this Cutless Wagon

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Recently the rear wagon door latch started cycling when the car was in Park or Neutral and the remote door control quit working. My mechanic disconnected the rear latch control. Was told that the unit that controls both was located behind the inside storage compartment at the rear left side panel and we would have to have the number from that unit in order to get the correct match. Upon removing the compartment we found it was not there nor can we find it any were else in the rear panels of the wagon. Does anyone know where it could be located and where we can find a replacement? My Carquest supplier says they do not list that part for that early date of wagon.