Chevrolet 15135858 Rear Side Door Latch Assembly

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The power door lock system operates the door lock actuators in each door, consisting of switches, actuators, Body Control Module (BCM), and associated wiring. Diagnosis typically involves checking the wiring connections and actuators for minor faults that can be easily repaired. The system is operated by bi-directional solenoids located in the doors, with lock switches having two positions: Lock and Unlock. These switches send a signal to the BCM, which then sends a signal to the door lock solenoids. It is important to check the circuit protection first, as some vehicles use a combination of circuit breakers and fuses. If no voltage is present at the switches, the wiring between the fuse panel and the switches should be checked for shorts and opens. If voltage is present, the switch should be tested for continuity and replaced if there is none. If the switch has continuity, the wiring between the switch and the door lock solenoid should be checked. If all but one lock solenoids operate, the trim panel should be removed from the affected door to check for voltage at the solenoid while the lock switch is operated. If the inoperative solenoid is receiving voltage, it should be replaced. If the inoperative solenoid is not receiving voltage, an open or short in the wire between the lock solenoid and the relay should be checked. In some models, the power door lock system communication goes through the Body Control Module, and if the above tests do not identify the problem, the vehicle should be taken to a dealer or qualified shop with the proper scan tool to retrieve trouble codes from the BCM. The keyless entry system, on the other hand, consists of a remote control transmitter that sends a coded infrared signal to a receiver, which then operates the door lock system. The battery should be replaced when the transmitter does not operate the locks at a distance of ten feet, with the normal range being about 30 feet. To replace the battery, the case halves should be carefully separated using a small screwdriver, and then the three-volt battery should be replaced before snapping the case halves together.

If the switch does not have continuity, it should be tested and replaced if necessary.