M48 serail connector pinout

[Andrew C]

Which pins on the serial connector (D9) are tx and ground? My dash manufacture want to use pin 2, but that spot is open both on my harness and the schematic.

Thanks

[AdamW]

You cannot connect directly to the ECU, you must use a PCI cable or a CIM. On the PC end of the PCI cable, Tx is pin #2, ground is pin#5.