Stoplight Switch

WARNING: This page is about a different car, the 2003 Mitsubishi Eclipse. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the connector.
Check for continuity between the terminals of the switch.

Fig 1: Stoplight Switch Terminals Continuity Reference Table
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Identifying Stoplight Switch Terminals
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.