B11/16 is ground (see attached), but I haven't found any reference to pins 7 and 10 in any diagrams for that generation.
According to the schematic, only 17 pins out of 20 appear to be used; the unused ones are 7, 8, and 10. (The wires at those pins could be on another schematic, but I haven't found any.)
Are you sure 7 and 10 are indeed occupied?
The diagram of the connector at the bottom of the attached schematic shows the pin numbers when looking at the connector face on (that is, the way the T4 connector from the transmission "sees" it). When looked at from the back of B11, all the pin positions are reversed.