Remove the headliner.
Disconnect the front drain tubes (A) and the rear drain tubes (B). Detach the tube clip (C).
With an assistant holding the frame (A), remove the bolts, then remove the frame.
Honda Odyssey Service Manual > Accessory Outlets: AC Power Outlet Replacement Remove the rear side trim panel. Remove the power outlet (A), and disconnect the 3P connector (B). AB Install the power outlet in the reverse order of removal. ...