RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
Power Door Lock Actuator: Testing and Inspection
For additional testing and inspection information please refer to Powertrain Management/Computers and Control Systems/ See: Body Control
Systems/Central Timer Module
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 version of the CTM, confirm proper power lock switch, power lock switch output circuit, and CTM operation before you
proceed with this diagnosis. See Power Lock Switch and Central Timer Module in the Diagnosis and Testing. On models with a high-line version of the
CTM, remember that the CTM circuitry controls the output to each of the power lock motors.
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. Unplugging a shorted power lock motor from
the power lock circuit will allow the good power lock motor to operate. Unplug each power lock motor wire harness connector, one at a time, and
recheck both the lock and unlock functions by operating the power lock switch. If both 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 power lock switch or high-line CTM. If unplugging one power
lock motor causes the other motor to become functional, go to Step 3 to test the unplugged motor.
3. Once it is determined which power lock motor is inoperative, that motor can be tested as follows. Unplug the wire harness connector at the
inoperative power lock 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 between the power lock motor and the power lock switch or high-line CTM
as required. If not OK, replace the faulty power lock motor.
