99 V70 GLT E-Fan Not Switching On

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I just picked up a '99 V70 GLT, low miles, but many problems, and the first to address is the e-fan that is not working, no grounding to activate the relay.

Does anyone know where the ground originates? I get a constant 170k ohms, whether the temp is at or above operating temps, not getting a complete ground, which I would assume comes through the ECM when it see the temp rise/ rate-of-rise to turn it on. ECM failure?

New temp sensor and 87 deg t-stat, car runs fine otherwise, temps via OBDII show constant 87 deg F normal operating temps, using a manual switch on the fan.

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