WARNING: This page is about a different car, the 2008 Subaru Tribeca, 2008 Subaru Outback, and 2008 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
Illuminations of the various indicators on the combination meter are controlled in accordance with the shift pattern selection as shown below.
Fig 1: Illumination Control Of Various Indicators Chart