Check for continuity between the door multiplex control unit 37P connector No. 30 and No. 31 terminals.
Is there continuity?
YES
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Repair a short between the LOCK and UNLOCK wires.■
NO
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Check for an open in the driver's door lock switch (LOCK) wire or the driver's door lock knob switch (UNLOCK) wire between the door multiplex control unit and the driver's door lock knob switch. If OK, replace the driver's door lock actuator.■