Some Mazda CX-9 owners report experiencing issues with door locks, particularly when the left-hand directional signal causes the locks to actuate with each flash and re-lock when using the remote. These problems may stem from a malfunctioning actuator, which is responsible for moving the lock mechanism. If the issue is isolated to one door, it could indicate a wiring or actuator problem. Additionally, electronic door lock actuators, which control the locking and unlocking of the doors, may exhibit unpredictable behavior, leading to erratic locking or unlocking actions. Owners have noted inconsistent locking behavior, such as partial locking or unlocking, and some have experienced unusual noises during operation. It is crucial to address these potential causes promptly to diagnose and resolve the door lock issues effectively.
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