S15 fuse box harness mystery plug

[Steve15]

Tearing apart a JDM s15 fuse box harness to condense down on unnecessary wires, relays, and fuses. Does anyone have any idea what this block is for? Is it a relay and if so, for what? It has 3 wires coming out of it, 2 grounds and 1 thick red/white wire. If anyone has any idea of what it is or if I actually need it that'd be awesome. :) Thanks!

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Sorry for just having a link...trying to add photos on mobile sucks...

[Sills]

Jdm Legion has good electrical writeups and diagrams for Silvias. Id check there and see if you can find it!