B250 3/4 Ton Van V8-360 5.9L (1984)
Power Door Lock Motor: Testing and Inspection
To determine which door solenoid is defective, check for proper lock/unlock operation at each door. If none of the solenoids operate, the problem may
be due to a shorted door solenoid. Disconnecting the defective solenoid will allow the others to operate. The side and rear doors maybe disabled from the
system by opening these doors one at a time and re-testing each time. If the system operates properly with a door disabled from the system, then that door
solenoid may be defective.
To test an individual door solenoid, remove the door trim panel(s) to gain access to the door solenoid. Unplug the door solenoid connector and connect a
voltmeter between the "lock" wire (OR) and a known good ground. Move the lock knob to the lock position and check for available voltage. Connect the
voltmeter to the "unlock" wire (LB) and move the lock knob to the unlock position again checking the available voltage. If voltage is present in both lock
knob positions, the door solenoid is defective. If voltage is not present in one position or neither positions, the relay, door switch, or connecting wires
may be defective.
