Does anybody know if there are other pins populated on this connector beside pins 8, 9 and 13? This is the connector used on the cloning cable RKN-4036B. Thanks

After looking into this, it looks like pin 2 of the universal connector side of the adapter is grounded through a 150 ohm resistor inside the Hirose Adapter NTN5213C. I have my speaker return line grounded on a PCB which I have also connected to the EXT/INT- pin on the Hirose connector. I was thinki...

I think you are forgetting that the keyload adapter has parts inside of it. There is a small IC that takes care of things. I want to say that either shorting or applying voltage to either the mic or speaker line is what shifts it to keyload mode. I tend to think it's a voltage on the speaker output...