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also found this: maybe?
On models not equipped with Vehicle Control Module (VCM), ENG 1 fuse (20-amp) located in instrument panel fuse block supplies voltage to coil side of auxiliary cooling fan relay with ignition switch in ON position. A ground path for cooling fan relay is supplied by A/C high pressure switch, or auxiliary fan control switch (if equipped). On models equipped with VCM, a ground path for fan control relay is supplied by VCM. As a result, relay contacts close, allowing current to flow to cooling fan motor through relay, resulting in auxiliary cooling fan motor operation.
then a description of it:
- 21 - ENG 1 20 Amp (Yellow) IGN A Switch to Engine Loads, EGR, Canister Purge EVRV Idle Coast Solenoid, Heated O2 Sensor, Fuel Heater, Water Sensor
lastly, I see a few references that point toward repairing the ignition feed to the heated oxygen sensors , so maybe try unhooking them/checking the wiring