Buick 19257149 Rear Side Door Latch Assembly

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The power door lock system operates using door lock actuators mounted in each door and includes switches, actuators, lock and unlock relays, the Body Control Module (BCM), and associated wiring. Diagnosis usually involves simple checks of wiring connections and actuators for minor faults. The system utilizes bi-directional solenoids in the doors, mounted as part of the door latch. Lock switches have Lock and Unlock positions, sending signals to the BCM, which activates the door lock relays, providing voltage to each door lock solenoid. To troubleshoot, check circuit protection first, including fuses and circuit breakers. Verify voltage at the switches and check for continuity; if necessary, replace faulty switches. Check the wiring between the switches, BCM, door lock relay, and solenoid if needed. In case of an inoperative solenoid, test for voltage and ground, check for breaks in the wiring, and replace the solenoid if necessary. Communication for the power door lock system passes through the Body Control Module, and if the issue remains unresolved, retrieve trouble codes from the BCM using a scan tool. The keyless entry system uses a remote control transmitter sending an infrared signal to the receiver to operate the door lock system. Replace the battery when the transmitter's range decreases. To replace the key remote control battery, carefully separate the case halves, replace the battery, and snap the case back together. Programming replacement transmitters requires a specialized scan tool, so take the vehicle and transmitters to a dealer or qualified repair shop with the necessary tool to have the transmitter(s) programmed into the vehicle. Up to eight key fobs can be programmed to one car, and all fobs must be present during reprogramming.

To remove the door latch, start by removing the door trim panel and water shield. Then, remove the retainers for the cable and disconnect the electrical connector from the latch. Detach the rods from the latch and remove the latch mounting fasteners. For installation, simply reverse the removal process. To remove the outside handle, open the door and remove the small access cover. Loosen the retainer but do not remove it. Pull the door handle out halfway and remove the small cover, then remove the handle. Installation is the reverse of removal. To remove the door lock cylinder, remove the door trim panel and plastic water shield. Remove the door handle and disconnect the latch rod from the lock cylinder and handle rod. Remove the fastener securing the door handle housing and release the retainer from the rear of the door lock cylinder. Push the lockout of the housing. Installation is the reverse of removal.

Programming replacement transmitters requires a specialized scan tool, so it's advisable to take the vehicle and transmitters to a dealer or qualified repair shop with the necessary tool to have the transmitter(s) programmed into the vehicle.

To remove the door lock cylinder, remove the door trim panel and plastic water shield. Remove the door handle and disconnect the latch rod from the lock cylinder and handle rod. Remove the fastener securing the door handle housing and release the retainer from the rear of the door lock cylinder. Push the lockout of the housing.