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1st, I have replaced Stereo's before. With a little patience and reading the wire manual, it is not that difficult, just takes time.

With that said, I purchased a Pioneer AVH-W4500NEX from Curtchfield and purchased their fitting wire harnesses they recommended (Which is the Metra Elec 70-7903 Wiring Harness). I also got the steering wheel controls and some other parts, but that is not important for this thread.

Received stereo and parts, took out factory headunit (super easy) and found that the connections do not fit the Metra 70-7903. The Metra 70-7903 was much too large for this unit (see pictures for details).

Did research on CarID and they offered a different wiring harness (carid (dot) com/metra/aftermarket-radio-wiring-harness-with-oem-plug-mpn-70-7552.html?singleid=4732211&url=79841345). ordered, received, does not fit.

Went to car stereo shop, again, they did their lookup and found Metra 70-7903 but when they looked at the headunit, they confirmed that wire harness will not fit.

Pretty lost at this point. Just looking for anyone who knows how to fire this Headunit connections to any replacement stereo. If it is not possible, then it is not possible and ill return my Pioneer.

I have p[pictures from my unit and some I got off the internet and other posts.

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Below are the connections I am having issues with.
Left-controls the CANBUS/CAMERA
Right-Controls the Setero (which is the problem child)
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You have to connect the 70-7903 Wiring Harness to the other factory wiring harness that is located in the passenger side kick panel, remove the glovebox and behind it you will have a module, disconnect that harness and then connect it to the 70-7903. Run the wires to the Pioneer AVH-W4500NEX harness, you will have to solder or crimp the wires, and done!
 

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Discussion Starter #3
HA, I already returned the unit but ill check this out and take some pictures and report back to see what it looks like.
 

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This is for a 2015 Mazda 3, the red one is the 70-7903 harness and the white one connected to it is the factory harness. Behind it you can see the module it was connected to.
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