WARNING: This page is about a different car, the 2006 Mitsubishi Montero. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Auto-Cruise Control Switch System Circuit Diagram (1 Of 2)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Fig 2: Auto-Cruise Control Switch System Circuit Diagram (2 Of 2)