DTC P1585: Cruise Control Inhibit Output Circuit: Description
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Output Driver Modules (ODMs) are used by the Powertrain Control Module (PCM) in order to turn on many of the current-driven devices that are needed to control various engine and transaxle functions. DTC P1585 set indicates that an improper voltage level has been detected on the output circuit which control the cruise control inhibit circuit.