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Well, here's my status.
I've ordered some SMD resistors from China to try to convert my Legacy SWCs to Impreza SWCs, and I'm still waiting for them to come in. Otherwise, I'm nearly certain that the Impreza SWCs will be plug-n-play, but I'd rather flip them on ebay as they're completely intact, if I can mod the chopped-up Legacy SWCs to be Impreza SWCs. (For those not following, the new Legacy and Impreza have the same circuit boards and buttons with different resistor networks, the Fujitsu Ten head unit in the BRZ needs the Impreza-style resistor network).
I'm trying to figure out how to insert pins into the 28-pin harness. I'm going to try floppy drive connector pins and the pins from a 3-pin computer fan this weekend - if none of those work, I'm going to carefully measure the existing pins with a caliper and see if I can find something in a catalog that will work.
I'm also mulling over my mounting method. I've got a suction cup camera mount and a suction cup radar detector mount, and I want to rig something up. My current top choice for location is to have them sticking out of the steering column on the right hand side below the wipers. I'll likely just mount the adhesive disk that comes with suction cup mounts on the right side of the steering column, then I'll be able to mod the suction cup mount to have the SWCs, and I'll be able to easily adjust or remove them.
For wiring, I'm going to grab a crappy cat5 wire and use that, as the SWCs have three signal pins, an illumination pin, and a ground, so that will work nicely with the cat5, and I'll wire up an intermediate connector to easy installation and troubleshooting.
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