Scan Tool Method

Turn ignition off. Connect scan tool to Data Link Connector (DLC) located under left side of dash, near center console. See Fig 1 .
Turn ignition on. Turn CRUISE switch on. Read DTC(s) on scan tool. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table. Diagnose affected circuit(s).

Fig 1: Connecting Scan Tool To Data Link Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Connecting Voltmeter & Identifying Data Link Connector (DLC) Terminals

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA