2002-2005 Subaru WRXs require the use of an Initialization Connector when using an Accessport to flash a map on the ECU. The connector will be used during Install, Uninstall, and any full reflash of the ECU. This blue connector is specific to the 2002 WRX.
The 2002 WRX requires the use of this particular Initialization ("init") Connector in order to get the car into Test Mode, which is when there is open communication with the ECU and a Reflash is possible.
Subaru 02 WRX Init Connector
Works on 2002 WRX
Needed to Relash ECU
Test Mode Connector
*Pictures used for marketing purposes only, actual product may vary