Wiring diagrams for a 2000 honda accord?

ive been trying to install a new head unit by splicing the wires, (I know it isnt recommended) and ive figured out all the wires on the stereo but I cant seem to find a diagram that is accurate for my car, there is 2 wires missing in the diagrams, a black wire and a blue wire, also usually the black wire is the ground wire right? Well in this case there is 2 black wires and im at odds on what the extra black and blue wires are for

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