Pull off the outside rear view mirror. Guide the power wire through the hole in the door.
Install new mirror
Replace the old mirror. Put the new power mirror in place. Push the new wiring through the hole in the door. Install and tighten the three retaining nuts you took off when removing the old mirror.
Connect the power mirror wiring to the connection located on the door panel, and replace the mirror cover.
Put the front door trim panel back in place by securing all clips and tightening all screws. Connect the Subaru Outback’s battery cable to restore the power.