Grand Cherokee 2WD V8-4.7L VIN N (2000)
Power Door Lock Control Module: Testing and Inspection
NOTE: The following tests may not prove conclusive in the diagnosis of this component. The most reliable, efficient, and accurate means to diagnose
this system involves the use of a ORB scan tool and the proper Diagnostic Procedures.
Remember, the Driver Door Module (DDM) circuitry controls the output to the driver side front door power lock motor. The Passenger Door Module
(PDM) circuitry controls the output to the power lock motors for the remaining doors and the liftgate.
1. Disconnect and isolate the battery negative cable. Remove the front door trim panel. Go to Step 2.
2. Check the 15-way door wire harness connector for the door module to see that it is fully seated in the door module connector receptacle. If OK, go
to Step 3. If not OK, install the door wire harness connector in the door module connector receptacle properly.
3. Disconnect the 15-way door wire harness connector for the door module from the door module connector receptacle. Check for continuity between
the ground circuit cavity of the 15-way door wire harness connector for the door module and a good ground. There should be continuity. If OK, go
to Step 4. If not OK, repair the open ground circuit to ground as required.
4. Connect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the 15-way door wire harness connector for the
door module. If OK, go to Step 5. If not OK, repair the open fused B(+) circuit to the Power Distribution Center (PDC) fuse as required.
5. Disconnect and isolate the battery negative cable. Check for continuity between the door lock driver circuit cavity of the 15-way door wire harness
connector for the door module and a good ground. Repeat the check for the door unlock driver circuit. In each case there should be no continuity.
If OK, go to Step 6. If not OK, repair the shorted door lock or unlock driver circuit as required.
6. Disconnect the door or liftgate wire harness connector from the inoperative power lock motor wire harness connector. Check for continuity
between the door lock driver circuit cavities in the door or liftgate wire harness connector for the inoperative power lock motor and the 15-way
door wire harness connector for the door module. Repeat the check for the door unlock driver circuit. In each case, there should be continuity. If
OK, go to Step 7. If not OK, repair the open door lock or unlock driver circuit as required.
7. Reconnect the 15-way door wire harness connector to the door module connector receptacle. Connect the battery negative cable. Go to Step 8.
8. Connect the probes of a reversible DC digital voltmeter to the door lock and unlock driver circuit cavities of the door or liftgate wire harness
connector for the inoperative power lock motor. Observe the voltmeter while actuating the power lock switch in the lock and unlock directions.
There should be a short 12-volt voltage spike as the switch is moved to both the lock and unlock positions, and no voltage in the neutral position.
If OK, refer to Power Lock Motor in the Diagnosis and Testing. If not OK, replace the faulty door module.
