central locking pump (only one function of more) IS called PSE pump. it is under the rear seats. The another pump (close assist pump) is in the trunk. I can be 100% sure because my car has not any close assist pump at all ... and the trunk handle is working.On 92 models I believe the central locking pump is responsible for the trunk handle not the pse pump in the trunk. It is also responsible for a\c flap in the middle and reverse guides.