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
.
Remove the front drain hose from the sunroof module.
Remove tape from the drain hose.
Remove the front drain hose from the retaining clips.
Pull the front drain hose out of the front hinge pillar.