Continuity Of Contacts
WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
With the plunger faced downward, push down the magnetic switch. In this state, check for continuity between terminals (B) and (M). Replace if there is no continuity. See
Courtesy of ISUZU MOTOR CO.