Abstract: A diaphragm seal and sealing assembly for isolating terminal cavities of an electrical connector system in a vehicle. The sealing assembly includes a male connector housing, a diaphragm seal, and a female connector housing. The diaphragm seal includes a floor and a plurality of terminal compression sealing members that extend from the floor of the seal. The terminal compression sealing members have faces with apertures therein, where male blade terminals of the system project through the apertures. The female connector housing compresses the sealing members, and the members isolate the blade terminals from each other. The diaphragm seal also includes at least one retainer button to connect the floor of the seal with the male connector housing of the electrical connector system.