Corvette CCM Reverse Engineering Anyone?

[NomakeWan]

Thanks, that helped me make sense of the pin numbering terminology. They're numbered 1-16 right to left, so what I was calling gray 31 & 32 are F1 and 2 and grounds are on E15 and 16. I assume the gray connector is c and d. Maybe the unpopulated 40 pin IDC header is a and b?

I'm not getting anything with only one serial pin connected, so am having to find connectors to add a second.

Oddly, I'm finding when I power up the board without applying power to the CCM1 and CCM3 circuits, the board sometimes comes up in sleep mode, and sometimes doesn't, but seems to go to sleep eventually. Both of the two additional power circuits are unswitched to battery afaik.

Please see below the relevant pages for pinouts related to power supply and ALDL comms.

ccmwiring1.jpgccmwiring2.jpg