A method of operating a connector with a terminal position assurance member, comprising: inserting a bottom of a body of the terminal position assurance member into a first aperture formed by the connector; causing a first guide, formed on the body of the terminal position assurance member and extending outward from the body in a first direction, to be at least partly received by a second aperture formed by the connector; causing a second guide, formed on the body of the terminal position assurance member and extending outward from the body in a second direction opposite to the first direction, to be at least partly received by the third aperture formed by the connector; wherein the first guide has a first shape and the second guide has a second shape different than the first shape; wherein a first protrusion is on a first side of the body, a second protrusion is on a second side of the body, a third protrusion is on the first side of the body, and a fourth protrusion is on the second side of the body; engaging the first protrusion on the first side of the body of the terminal position assurance member with a first tab formed in the first aperture of the connector; and then receiving the first protrusion in a first receiving area formed adjacent to the first tab, engaging a second protrusion on a second side of the body of the terminal position assurance member with a second tab formed in the first aperture of the connector; and then receiving the second protrusion in a second receiving area formed adjacent to the second tab, wherein the first side is opposite to the second side to place the terminal position assurance member in a preset position, wherein at least the first protrusion is more flexible than the first guide; and engaging the third protrusion on the first side of the body with the first tab formed in the first aperture of the connector; and then receiving the third protrusion in the first receiving area formed adjacent to the first tab, engaging the fourth protrusion on the second side of the body with the second tab formed in the first aperture of the connector and then receiving the fourth protrusion in the second receiving area formed adjacent to the second tab to place the terminal position assurance member in a final lock position, wherein the first and second tabs (332, 342) are visible when the terminal position assurance member is in the final lock position. inserting a bottom of a body of the terminal position assurance member into a first aperture formed by the connector; causing a first guide, formed on the body of the terminal position assurance member and extending outward from the body in a first direction, to be at least partly received by a second aperture formed by the connector; causing a second guide, formed on the body of the terminal position assurance member and extending outward from the body in a second direction opposite to the first direction, to be at least partly received by the third aperture formed by the connector; wherein the first guide has a first shape and the second guide has a second shape different than the first shape; wherein a first protrusion is on a first side of the body, a second protrusion is on a second side of the body, a third protrusion is on the first side of the body, and a fourth protrusion is on the second side of the body; engaging the first protrusion on the first side of the body of the terminal position assurance member with a first tab formed in the first aperture of the connector; and then receiving the first protrusion in a first receiving area formed adjacent to the first tab, engaging a second protrusion on a second side of the body of the terminal position assurance member with a second tab formed in the first aperture of the connector; and then receiving the second protrusion in a second receiving area formed adjacent to the second tab, wherein the first side is opposite to the second side to place the terminal position assurance member in a preset position, wherein at least the first protrusion is more flexible than the first guide; and engaging the third protrusion on the first side of the body with the first tab formed in the first aperture of the connector; and then receiving the third protrusion in the first receiving area formed adjacent to the first tab, engaging the fourth protrusion on the second side of the body with the second tab formed in the first aperture of the connector and then receiving the fourth protrusion in the second receiving area formed adjacent to the second tab to place the terminal position assurance member in a final lock position, wherein the first and second tabs (332, 342) are visible when the terminal position assurance member is in the final lock position.