Rectangular Waterproof Connector

Disengage the front holder with a screwdriver and remove it.

Fig 1: Disengaging Front Holder Using Screwdriver
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Insert the tip of a screwdriver (0.8 mm (0.03 inch) width) into the connector as shown in the illustration, push it lightly to raise the housing lance, and pull out the terminal.

Fig 2: Inserting Tip Of Screwdriver Into Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Press the contact point to the male terminal down by holding a screwdriver (1.4 mm (0.06 inch) width) as shown in the illustration. Lightly squeeze the outer edge so the flats are parallel with the bottom.

Fig 3: Pressing Contact Point To Male Terminal Down Using Screwdriver
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.