I'm running into the same issue here today. It seems like the Metra adapter is mislabeled like crazy. As people above have found out, the pins referenced in the AXXESS instructions (grey/red, grey/blue) correspond with rear speakers on the Metra adapter.
So now it seems like I have to unfortunately splice into the vehicle side of the wiring which is what I thought I was avoiding by buying the Metra adapter in the first place.
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