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dtc code 0449. replaced vent valve, repaired bad pins in pass through connector on 2005 Chevrolet Uplander

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Checked the wiring at passthrough when replacing pins.. wiring good through vent valve, back to connector.. QUESTION.. with KEY ON, should I see B+ on the red/white wire? I checked it and I don't have any voltage.. when is voltage applied, at key on or at a computer detrmined time?
I know the system supplies B+ to the vent valve, and through ground, back to the ecm.. but when should I see B+? Thanks.
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