Round 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.

Remove the waterproof cap by using a screwdriver.
Insert the tip of the screwdriver [1.4 mm (0.06 inch) or 2.0 mm (0.08 inch) width] into the connector as shown in the illustration, raise the housing lance slightly with the tip, and pull out the terminal.

Fig 1: Inserting Tip Of Screwdriver Into Waterproof Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Insert a screwdriver through the hole provided on the terminal and raise the contact point. Lightly squeeze the outer edge so the flats are parallel with the bottom.

Fig 2: Inserting Screwdriver Through Hole Provided On Terminal
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.