Make sure the door gets locked then verify if the motor hums when the relay on the motor controller clicks. Check the resistance/continuity of the motor windings through the carbon brushes and the continuity of the motor wire harness if the motor doesn't hum. Make sure the wier harness is intact and the connectors are clean and snug fit. Replace the wire harness if necessary or the motor controller if the wire harness, the motor windings are all good and the motor doesn't hum at all. Replace the motor if it just hums or if the windings are open.
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