Lock for a motor vehicle opening leaf with a disengageable wrist pin

A lock for a motor vehicle opening leaf, comprising a wheel (RD) intended to be driven in rotation about an axis (A1) under the action of an electric motor so as to move, via a wrist pin (MT), an opening member (OV) from a closed position to an open position, said wrist pin (MT) being secured to a plate (PT) mounted so that it can rotate about said axis (A1), said lock further comprising a first and a second associated member for coupling the plate (PT) and the wheel (RD) in terms of rotation, these associated members being borne respectively by the wheel and by the plate, said first and second associated members comprising a drive peg (PE) and an associated groove (RO) in the form of an arc of a circle, so that said wrist pin (MT) is free to turn about said axis (A1) through a certain angle to avoid jamming of said opening member in the event of failure of said motor, characterized in that said plate (PT) is also connected in terms of rotation to said wheel (RD), wherein said wheel (RD) is toothed, by a torque limiter so that said plate positions itself in a stable way in a neutral position for which the wrist pin (MT) is uncoupled from the opening member (OV) in the event of failure of said motor.