RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN C (2002)
Power Door Lock Actuator: Testing and Inspection
On models with a base version of the Central Timer Module (CTM), confirm proper power lock switch operation before you proceed with this
diagnosis. On models with a high-line or premium version of the CTM, confirm proper power lock switch, power lock switch output circuit, and CTM
operation before you proceed with this diagnosis.
See: Body Control Systems/Body Control Module
Remember, the power lock switch controls the output to the power lock motors on models with a base CTM, while the CTM controls the output to the
power lock motors on models with a high-line or premium CTM. 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 both of the
power lock motors are inoperative, go to Step 2. If one power lock motor is inoperative, go to Step 3.
2. If both 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 motors to operate. Disconnect the wire harness connector from each power lock motor,
one at a time, and recheck both the lock and unlock functions by operating the power lock switch. If both power lock motors are still inoperative
after the above test, check for a short or open circuit between the power lock motors and either the power lock switch (base CTM) or the CTM
(high-line or premium CTM). If disconnecting one power lock motor causes the other motor 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 door 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 pigtail wire 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 power lock motor and the power lock switch (base CTM) or the CTM (high-line or premium CTM) as required. If not OK,
replace the faulty power lock motor.
