G5 Harness info:
The G5 plugs in to the same JB4 harness, although those using older
harnesses may need to swap around wires on the DB25. Previously DB25
positions 10 and 22, and 11 and 23 were interchangeable. Now, the female
connectors of each pair must be on 22 and 23 or you will get a
wastegate fault. We don't have notes on when we started orienting them
in the current proper configuration but we think it was around 2010.
Harnesses that don't have a white connector, or that have an old 3 port
expansion connector, will definitely need to be checked with a
multimeter and those pins moved around in the DB25 using a DSUB tool as
needed.
DB9 slots for extra wires are as follows:
2: SLD Output (female), connects to gray connector position #17 as read from the female side.
4: CPS Output (female), connects to large black connector position #29 as read from the female side.
6: SLD Input (male), goes in male end of gray position #17 as read from the female side.
7: 2STEP / Relay input / ground, relay intercepts green power connector position #8.
9: CPS Input (male), goes in male end of large black #29 as read from female side.