It is only necessary to lower the headliner. Only do those step in headliner replacement that will lower the headliner enough to
gain access to the part. Refer to
Headlining Trim Panel Replacement.
Disconnect the front sunroof drain hose from the sunroof drain spigot.
Disengage the sunroof drain hose from the attachment points on the windshield pillar.
Pull the grommet and a short length of the front drain hose out of the front hinge pillar.