Grand Cherokee 2WD V8-4.7L VIN J (2004)
Power Door Lock Actuator: Testing and Inspection
DIAGNOSIS AND TESTING - POWER LOCK MOTOR
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. Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector
pin-out information and location views for the various wire harness connectors, splices and grounds.
1. Check each power lock motor for correct operation while moving the power lock switch to both the Lock and Unlock positions. If all of the power
lock motors are inoperative, go to Step 2. If one power lock motor is inoperative, go to Step 3.
2. If all of the power lock motors except the driver side front door are inoperative, the problem may be caused by one shorted motor. Disconnecting a
shorted power lock motor from the power lock circuit will allow the good power lock motors to operate. Disconnect the wire harness connector
from each PDM-controlled power lock motor, one at a time, and recheck both the lock and unlock functions by operating the power lock switch. If
all of the PDM-controlled power lock motors are still inoperative after the above test, check for a short or open circuit between the power lock
motors and the PDM. If disconnecting one power lock motor causes the other motors to become functional, go to Step 3 to test the power lock
motor that was last disconnected.
3. Once it is determined which power lock motor is inoperative, that motor can be tested as follows. Disconnect the door or liftgate wire harness
connector from the inoperative power lock motor. Apply 12 volts to the lock and unlock driver circuit cavities of the power lock motor connector
to check its operation in one direction. Reverse the polarity to check the motor operation in the opposite direction. If OK, repair the shorted or
open circuits between the lock motor and the DDM or PDM as required. If not OK, replace the faulty power lock motor.
