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Top row is 1 to 8, left to right. Bottom row is 9 to 16, also left to right. 4 and 5 should be ground, so you can use that or chassis.
2 is SCP Bus + or aux input
10 is SCP -
13 is PCM input
Moose, Thanks for the time to look into it for me. I pressume you can communicate with a scan tool, or torque? In you sig, you say custom tunes, what type of chip are you using.
My voltage on pin 10 was 5VDC and I had trace voltage, maybe .5VDC on 13. Did you go to chassis, or pin 4/5 for ground?