A vehicle body structure includes first and second body structures defining first and second interior cavities. A mounting portion of the base member is fixed to the first body structure. A guide member is fixed to the second body structure. A channel member is movably received by the guide member. A first end of the channel member is rotatably fixed to a receiving portion of the base member and defines a first end opening such that the receiving portion extends into the first end opening. A second end is positioned within the second interior cavity and defines a second end opening with a channel extending from the first end opening to the second end opening. The channel member extends across an exterior space between the first and second body structures. A wiring harness passes through the channel from the first interior cavity to the second interior cavity.