Main power for the ACC should be coming from Fuse #5. This controls the ACC, the KLIMA relay, and the little aspirator blower behind the glovebox.
Turn the key to "run" and wait for the seatbelt buzzer to quit and listen for the aspirator blower behind the passenger-side dash vent. If the fuse is good and it is running, the ACC itself may be bad or you may have a loose plug on the back side of it.
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