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I think you are asking how to access the power lock actuator in the door. To access it, you need to first remove the door panel. Here are the directions for that:
2012 Ford Focus L4-2.0L
Vehicle Â Body and Frame Â Doors, Hood and Trunk Â Front Door Panel Â Service and Repair
SERVICE AND REPAIR
Front Door Trim Panel
NOTE: Removal steps in this procedure may contain installation details.
WARNING: Before beginning any service procedure, refer to Safety Warnings in General Information. Failure to follow this instruction may result in serious personal injury. See: Testing and InspectionInitial Inspection and Diagnostic Overview
Refer to: Health and Safety Precautions See: Service PrecautionsHealth and Safety Precautions (100-00 General Information, Description and Operation). See: Testing and InspectionInitial Inspection and Diagnostic Overview
Remove the front door trim panel upper screw cover and remove the door trim panel screw.
Remove the interior door handle screw cover and remove the interior door handle screw.
Remove the 3 front door trim panel screws.
Release the 2 sail panel clips and remove the sail panel.
If equipped, disconnect the speaker electrical connector.
Release the 6 front door trim panel clips.
Disconnect the interior door handle cable and the door trim panel electrical connectors and remove the front door trim panel.
To install, reverse the removal procedure.
Transfer parts as necessary.
Once removed, the actuator will be in the rear of the door.
Let me know if you have other questions.
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Sunday, June 10th, 2018 AT 7:32 PM