Power Door Lock Actuator: 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.