Cherokee 4WD LHD L6-4.0L VIN S (2001)
Power Door Lock Actuator: Testing and Inspection
Before you proceed with this diagnosis, confirm proper power lock switch operation.(Refer to POWER LOCKS/DOOR MODULE - DIAGNOSIS AND
TESTING - POWER LOCK CONTROL). Remember, the Passenger Door Module (PDM) circuitry controls the output to each of the power lock
motors. 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 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 motor to operate. Disconnect each power
lock motor pigtail wire connector, one at a time, and recheck both the lock and unlock functions by operating the power lock switch. If all of the
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 disconnected motor.
3. Once it is determined which power lock motor is inoperative, that motor can be tested as follows. Disconnect the pigtail wire connector at the
inoperative power lock motor. Apply 12 volts to the power lock motor connector terminals to check its operation in one direction. Reverse the
polarity to check the operation in the other direction. If OK, repair the short or open circuits between the power lock motor and the PDM as
required. If not OK, replace the faulty power lock motor.
