Test A: One Door Lock Does Not Operate

If latch or linkage binding, spray Multi-Purpose Grease Spray (D7AZ-19584-AA) or equivalent, into latch opening and manually cycle 10 times. Check for interference around latch and all linkage.
While operating switch in both positions, check for voltage at actuator connector. See WIRING DIAGRAMS . Service circuit if necessary.
If the door lock actuator is malfunctioning, test door lock motor. See DOOR LOCK MOTOR under COMPONENT TESTS. Replace if necessary.