One of the wire colors is off or is washed out in the pic, but it matches the size shape, pin count, and location for the Defrost Control Relay connector.
Where you have BK/LB I'm showing BR/LB and your P/PK is P/O here. The wiring order is the same so it's likely the same connector. If you don't have rear defrost the connector was probably just taped up somewhere.