If Inspecting With The Connector Connected < Waterproof Connectors >
WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
Be sure to use special tool. Never insert a test probe from the harness side, as this will reduce the waterproof performance and result in corrosion.
Fig 1: Checking Open And Short Circuit In Harness Between Terminals