D 350 Pickup V8-360 5.9L VIN I (1985)
Door Lock Switch: Testing and Inspection
NOTE: The door switches are available only on the front doors.
Remove the door trim to gain access to the door switch.
Power Door Lock Equipment
Unplug the door switch connector and connect an ohmmeter between the center terminal and one of the outer terminals of the door switch. Move the lock
knob between the lock and unlock positions several times. The ohmmeter should show continuity (zero resistance) in only one of the positions. Connect
the ohmmeter between the center terminal and the other outer terminal and repeat the lock knob movement. The ohmmeter should now show continuity