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There are in fact two air control valves, the IAC (which controls the idle speed), and the Auxiliary Air Control Valve, which is used only to allow extra air to bypass the throttle plates when the engine is started from cold.
That valve is indeed controlled by the fuel pump relay, so that whenever the engine is running, 12V is supplied to the valve. Inside the valve is a bimetallic strip, which allows the valve to open when cold, and gradually close when 12V is applied, and the valve warms up.
If the valve is cold, it should only take a few minutes after 12V is applied for the valve to close completely.
Jason.
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1992 Charcoal Grey SVX - 165,000km
1992 Ruby Red SVX - 165,000km
....now with sequential VIN numbers! 
1986 Holden (Isuzu) Piazza Turbo - 225,000km
1993 Mercedes W140 S500 Coupe - 153,000km
1990 Mercedes W124 300D - 313,000km
EG33 + 4EAT + VTD AWD = SVX 
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