The ornamental design of a vehiclepillarunit, as shown and described.
FIG. 1 is a front perspective view of a right vehicle pillar unit showing my new design, the left being a minor image thereof;
FIG. 2 is a top perspective view thereof;
FIG. 3 is a front perspective view of a left pillar unit thereof; and,
FIG. 4 is a top perspective view thereof.
It will be understood that the broken lines presented in the drawings are for illustration purposes only, and do not form a part of the claimed design.