Hi, I have bought an aftermarket USB power port and I was thinking of splicing it into the 12v power port but I'm having a hard time identifying which wire is which. The wire colors are Grey and White with Black strip. Any help will be greatly appreciated.
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According to the ground distribution wiring diagram, the white wire with the black stripe is your ground. By a process of elimination, I'm going to state that the grey wire is your 12V power.
Ground Distribution — 2011 Toyota Matrix Base, Automatic Service Manual ~ LEMON Manuals
If you have a test light, that should be pretty easy to tell; connect the test light ground to any piece of grounded metal inside the car, then see which wire makes it light up; I'm betting on the grey.
Okay, I found the power distribution diagram and was able to confirm that yes, grey is power and white/black is ground. Take a look at the middle left of Figure 2 on this page; that shows the cigarette lighter assembly and both wires going to it.
Power Distribution — 2011 Toyota Matrix Base, Automatic Service Manual ~ LEMON Manuals
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Thank You! These diagrams were exactly what I was trying to look for but for the life of me I couldn't find them.
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