As to this pin out, the black wires in both round cables is connected to Pin 4 of of the OBD2 OBDII male and female connectors. There are 8 pins wired, so there are 8 wires of 26AWG in the round cable from OBD2 male plug to common OBD2 female connector. All 16 pins of OBD2 male plug to BMW female connector are wired, so there are 16 wires of 26AWG in the cable from OBD2 male plug to BMW OBD2 female connector.
The pin assignment or pin out can also be like this:
As to this pin out, all 16 pins of the OBD2 OBD male and female connectors are wired, so there are 16 wires of 26AWG in both round cables.
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