Door Lock Control Switch: Aerostar

Using a self-powered test lamp, there should be no continuity between any terminals with the switch in its normal position.
Continuity should exist between terminals No. 1 and 2 with the switch held in the LOCK position and between terminals 2 and 3 with the switch held in the UNLOCK position

Fig 1: Identifying Power Door Lock Switch Terminals

Courtesy of FORD MOTOR CO.