Smashed Rear Partition Glass from Break-ins
Most calls I take for the rear side glass on this sedan stem from smash-and-grab break-ins. Prowlers target the small triangular rear window assuming it provides quiet, low-effort access to the interior door locks, but it creates a complicated repair because the broken pane is not fixed to the exterior C-pillar sheet metal. On this Legacy sedan, the quarter glass is actually a door partition pane enclosed entirely within the rear door sash frame, right beside the main roll-down window.
When this piece shatters, tempered safety glass falls straight down past the vapor barrier into the bottom of the door cavity. The fragments wedge inside the lower track of the vertical division bar, around the door latch linkages, and under the power window regulator tracks. Unlike station wagons like the sibling Outback that carry a dark factory privacy tint on their rear glass, the Legacy uses standard green-tinted solar glass across trims like the 2.5i, Premium, Sport, and 3.6R Limited. It blocks 95% of UVA and 99% of UVB light without dark shading, meaning aftermarket tint film added by previous owners often holds the fractured shards together in a messy sheet instead of letting them crumble cleanly.
Framed Door Sashes and Gasket Mounting
Subaru transitioned away from its traditional frameless window designs years before this car rolled off the line, using rigid, fully welded window frame sashes. Because of this architecture, the rear partition glass is not glued with urethane adhesive to the vehicle body. It presses into a molded rubber weatherstrip channel, isolated from the movable door glass by a vertical partition sash secured by hidden bolts inside the door shell.
Whenever I handle this replacement, I fit aftermarket glass sourced from established manufacturers like Pilkington, PGW, FYG, or XYG, which delivers the exact factory green solar tone and matches the tight tolerances of the Subaru sash. Because there are no radio antenna grids, heating elements, or electronic sensors embedded in this glass, the fit depends entirely on how accurately the glass edge seats inside the surrounding rubber channel and division bar.
| Component | Driver Side (LH) | Passenger Side (RH) |
|---|---|---|
| Factory Partition Glass | 62012AL33A | 62012AL20A |
| Door Partition Weatherstrip | 62284AL01A | 62284AL00A |
| Sound-Fix Service Kit (TSB 12-177-14R) | 62099AL01A | 62099AL00A |
TSB 12-177-14 and Wind Noise Around the Division Bar
Early production builds of the 2015 model suffered from an aggressive wind-rushing noise directly at highway speeds, which Subaru addressed in technical service bulletin TSB 12-177-14R. The issue originated from air leaking past the upper corner of the rear door partition sash where the glass run channel meets the division bar. The factory revised the sealing approach on vehicles built after October 10, 2014, beginning at VIN break F3028031, by introducing updated partition weatherstrips, revised outer belt sweeps, and targeted butyl foam sealing tape.
If an earlier car has had its glass smashed or disrupted, reusing torn or deformed weatherstripping guarantees that highway cabin whistle will return. The rubber partition channel must seat smoothly along the division bar without pinched corners or rolled lips, ensuring the glass stays firmly sealed against the interior garnish trim and external window frame.
