Rectangular Waterproof Connector

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Disengage the front holder with a screwdriver and remove it.

Fig 1: Disengaging Front Holder With 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 Waterproof 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 By Holding Screwdriver
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.