Toyota
Dodge Durango
 Service Manual
Power Lock Systems » Diagnosis and testing
Power lock motor

Before you proceed with this diagnosis, confirm proper power lock switch, Central Timer Module (CTM) and power lock switch output circuit operation.

See Power Lock Switch and Central Timer Module in the Diagnosis and Testing section of this group. Remember, the CTM circuitry controls the output to each of the power lock motors. For circuit descriptions and diagrams, refer to 8W-61 - Power Door Locks in Group 8W - Wiring Diagrams.

(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.

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 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 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 CTM as required. If not OK, replace the faulty power lock motor.

    More about «Diagnosis and testing»:

    Power lock system and remote keyless entry system

    Power lock switch

    Central timer module

    Power lock motor

    Remote keyless entry transmitter

    Relays

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