Wagon Model

WARNING: This page is about a different car, the 2008 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the ground cable from the battery.
Remove the roof spoiler. <Ref. to REMOVAL , Roof Spoiler . >
Remove the nuts, then detach the high-mounted stop light.

Fig 1: Locating High-Mounted Stop Light Nuts

Courtesy of SUBARU OF AMERICA, INC.