Electrical connector mateable with a complementary mating connector, comprising: - a cover, comprising a blocking shoulder; - a mating assist lever pivotally mounted to the cover for being pivotable between an open position and a closed position, comprising a locking shoulder; - a connector positioning assurance member slideably mounted to the cover for being slideable between an inoperative position and a locked position, comprising a flexible locking arm, the sliding movement defining a slide direction wherein the flexible locking arm is arranged parallel to a longitudinal axis; the flexible locking arm being 2. bendable between a bended position and a rest position, wherein a rotating axis of the mating assist lever is perpendicular to the slide direction, characterizing in that: - the flexible locking arm comprises:∘ a locking ramp arranged on a distal end of the flexiblelocking arm in the slide direction and a blocking ramp arranged between the locking ramp and a proximal end of the flexible locking arm in the slide direction; the blocking ramp comprising a frontal blocking side for cooperating with the blocking shoulder, wherein when the mating assist lever is in the open position and the CPA member is moved from the inoperative position to the locked position, the flexible locking arm is in the rest position and the frontal blocking side of the blocking ramp and the blocking shoulder cooperate so as to generate a first threshold force resisting the CPA member from sliding from the inoperative position to the locked position; and the locking ramp comprising a slanted frontal locking ramp for cooperating with the locking shoulder, wherein when the mating assist lever is in the closed position and the CPA member is moved from the inoperative position to the locked position, the slanted frontal locking ramp of the locking ramp and locking shoulder cooperate so as to bend the flexible locking arm from the rest position to the bended position such that it prevents the blocking ramp and the blocking shoulder to cooperate, wherein the frontal blocking side is slanted and is more slanted that the slanted frontal locking ramp. - a cover, comprising a blocking shoulder; - a mating assist lever pivotally mounted to the cover for being pivotable between an open position and a closed position, comprising a locking shoulder; - a connector positioning assurance member slideably mounted to the cover for being slideable between an inoperative position and a locked position, comprising a flexible locking arm, the sliding movement defining a slide direction wherein the flexible locking arm is arranged parallel to a longitudinal axis; the flexible locking arm being 2. bendable between a bended position and a rest position, wherein a rotating axis of the mating assist lever is perpendicular to the slide direction, - the flexible locking arm comprises:∘ a locking ramp arranged on a distal end of the flexiblelocking arm in the slide direction and a blocking ramp arranged between the locking ramp and a proximal end of the flexible locking arm in the slide direction; the blocking ramp comprising a frontal blocking side for cooperating with the blocking shoulder, wherein when the mating assist lever is in the open position and the CPA member is moved from the inoperative position to the locked position, the flexible locking arm is in the rest position and the frontal blocking side of the blocking ramp and the blocking shoulder cooperate so as to generate a first threshold force resisting the CPA member from sliding from the inoperative position to the locked position; and the locking ramp comprising a slanted frontal locking ramp for cooperating with the locking shoulder, wherein when the mating assist lever is in the closed position and the CPA member is moved from the inoperative position to the locked position, the slanted frontal locking ramp of the locking ramp and locking shoulder cooperate so as to bend the flexible locking arm from the rest position to the bended position such that it prevents the blocking ramp and the blocking shoulder to cooperate, wherein the frontal blocking side is slanted and is more slanted that the slanted frontal locking ramp.