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

 

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a1gramps, Salt Lake City, UT, June 30, 2012, 06:31
 Rookie

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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