WARNING: This page is about a different car, the 2004 Dodge Grand Caravan, 2004 Dodge Caravan, and 2004 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
The idle air control valve is mounted on the throttle body. The PCM operates the idle air control valve (Fig 1) or (Fig 2).
Fig 1: Identifying Idle Air Control Valve
Courtesy of DAIMLERCHRYSLER CORP.
Fig 2: Identifying Idle Air Control Valve TPS/IAC 3.3/3.8L