RAM 2500 Van V8-318 5.2L VIN T Magnum CNG SFI (1997)
Power Door Lock Actuator: Testing and Inspection
Before you proceed with this diagnosis, confirm proper power lock switch and switch circuit operation. See Power Lock Switch for the diagnostic
procedures.
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 lock
motors are inoperative, go to Step 2. If one lock motor is inoperative, go to Step 3.
2. If all of the lock motors are inoperative, the problem may be caused by one shorted motor. Unplugging a shorted motor from the power lock circuit
will allow the good motors to operate. Unplug each motor wire harness connector, one at a time, and recheck both the lock and unlock functions
while operating the power lock switch. If all of the lock motors are still inoperative after the above test, confirm proper power lock and remote
keyless entry module operation. See Power Lock and Remote Keyless Entry Module for the diagnostic procedures. If unplugging one motor causes
the other motors to become functional, go to Step 3 to test the unplugged motor.
3. Once it is determined which lock motor is inoperative, that motor can be tested as follows. Unplug the wire harness connector at the inoperative
motor. Apply 12 volts to the motor 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 to the power lock and remote keyless entry module as required. If not OK, replace the faulty lock
motor.
