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0403scc Hybrid21 Z

The old ECU connector is the key. Most of the wires attached to it need to be removed. Follow them identify them, and remove them. The only parts that should stay are the ones (like the transmission plugs and diagnostic port) you cut from the new harness.
Hybrid How-To No. 14: Almost any Subaru chassis, GDB WRX engine

The old ECU connector is the key. Most of the wires attached to it need to be removed. Follow them identify them, and remove them. The only parts that should stay are the ones (like the transmission plugs and diagnostic port) you cut from the new harness.  View Related Article