28 pin connector

I have a Prius II and trying to install a axxess aswc-1 and it asked for the ground wire to tap in to pin 23 (pink), when I tapped the ground wire to pin 23, I get no power to the aswc but when I tapped it into a black ground wire from the stereo harness, I get power to the aswc. My question is am I counting the wires wrong? I counted from right to left to get to pin 23 which is a pink wire instead of black, am I counting wrong?