bad door lock actuator

my locks continuously 'relock' for about 5 minutes after i lock it. i have read that this is due to a bad actuator, but how do i know which actuator is bad? it happens when i lock the doors from any door and
the 'relocking' occurs on all four doors.
thanks.
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The driver door lock actuator is the controller for all door locks. If all of your locks are cycling then it's the drivers door actuator at fault. This is a common failure after many years. Howard

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