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Hello, I am looking into building a subwoofer setup for my 2007 fj cruiser that did not originally come with a sub. Even though it doesn't have a factory sub, I noticed that wiring for the sub is already there. Im not too sure what this wire harness exactly does. It could either just be sound, power, or both. Im really hoping im able to use this somehow to save me the trouble of running wiring all the way to the stereo or battery. If anyone knows please let me know. Also, does anyone know if there is some kind of an aftermarket adapter for that harness? I wasn't able to find anything online. Thanks!
 

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some more info

( c/p from another thread - https://www.fjcruiserforums.com/forums/stereo-electronics-electrical/67159-diy-oem-subwoofer-mod-7.html

K4 Sub Connector Pin Out(male)

1) R(Red) : R+
2) B(Black) : L+
3) GR(Gray) : ACC
4) W-L(White-Blue) : +B
5) W(White) : R-
6) Y(Yellow) : L-
7) W-B(White-Black): GND
8) Not used
9) V(Violet) : AMP+
10) Not used )
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K4 connector is the one in your photo

The metra 71-1761 reverse wire harness has a 10 pin female connector that should fit the K4 connector.
 

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