Passenger's Seat Belt Warning Light Check
WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
When an adult on the front passenger's seat wears the seat belt with the ignition switch "ON," confirm that the passenger's seat belt warning light goes out.
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.