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AC Relay Control. B134-17(RS) to D27(WRX).
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Fuel Tank Pressure Sensor. B136-12(RS) to B15(WRX). The green wire.
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Line End Check 2 (goes to OBD2 Check Plug). B135-21(RS) to A20(WRX).
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SSM/GST (goes to OBD2 Check Plug). B135-3(RS) to A21(WRX).
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Engine Speed (RPM/Output). B134-30(RS) toC9(WRX).
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Blower Fan Switch. No position on 99 RS. A9(WRX). The wire spits into 3 places form the WRX ECU. Two go to the HVAC panel controls and the other to the blower motor fan relay. Some random pictures of the wires. Note: I was told by a reliable source that the 2000/01 RS***8217;s have this wire at the ECU.
The 3 wire junction.
Green/red stripe wire.
Wire at HVAC panel.