Abstract: An electrical connector assembly includes a first connector having a body mounting a plurality of terminals, with a locking shoulder on the body. A second connector includes a body mounting a plurality of terminals engageable with the terminals of the first connector. The second connector is mateable with the first connector in a given mating direction. A flexible latch arm is mounted on the body of the second connector and includes a latch hook engageable with the locking shoulder of the first connector when the two connectors are mated in the given mating direction. The locking shoulder is located in an open-sided cavity in the body of the first connector to allow the latch hook to be lifted away from the locking shoulder in response to tilting the first connector relative to the second connector transversely of the given mating direction.