Connector A (lower part of the black plug) misses a couple of pins namely pin 1 (Speed) and pin 7 (Illumination-). I am not sure what is the purpose of pin 7 (I have never seen a head unit that uses it) but pin 1 might or might not be a problem, depending on whether your head unit has some speed-dependent behaviour (if it does you won't be able to use this feature without pin 1).
Connector B (upper part of the black plug) is spot on, in the sense that it has all the pins (as it should).
Connector C (the red one) was very problematic for my vehicle (2011 Kia Sorento). Only pin 18 is present, supposedly for connecting to the steering wheel remote control. Problem is, in my vehicle the said remote control talks to pin 16 rather than pin 18. I had pull the pin out and re-insert it in the proper place (which is pretty hard to do if you do not want to damage the pin in the process, as I believe that you are not supposed to do this). In my application I also had to insert a new pin 17 (remote control GND), though in fairness I might have accomplished the same thing by grounding the GND wire of the remote control adapter elsewhere
Overall the adapter almost works as advertised, but does require some work to make it behave. One should nonetheless be aware that some tweaking is probably necessary to make this adapter work.
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