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Rear Window Defogger Mystery Module

3771 Views 7 Replies 6 Participants Last post by  KwadKen
The rear window defogger stopped working on my 2011 OB Premium w/winter package. It was repaired under warranty but the dealer tech found that the wiring for the rear defogger did not match the service manual diagrams - he found a vented plastic covered module where the correct colored wires entered and wires colored differently from the service manual diagram emerged to the rear window grid. The tech called Subaru to ask what this module might be (he could see what appeared to be a coil of heavier gage wire inside through the vent holes of the module). Subaru had no clue. My guess is that this is a ballast resistor for a circuit serving the rear window, the rear-view mirrors and the windshield wiper heat. Anyone have a clue?
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Possibly mistaken dealer tech?

There's nothing in the power line to the rear gate (hatch) window defogger.

Where is that plastic-covered module? Is it in the rear gate, above the window? If it is, then it's the radio antenna amplifier.

The radio antenna amplifier has wires coming in (signal, power) from the body, and wires going out to the grid on the glass, so it could look as if it's connected to the defogger grid, but isn't. (There's two separate set of grid wires on the rear window -- the radio antenna, and the defogger.)


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