2005 Owners Manual, page 83

The spoiler can also be deployed at lower speeds using
an override switch mounted in the center console.
Once manually deployed, the spoiler will only retract by
pressing the bottom of the spoiler switch. The spoiler will
then retract in steps as long as the switch is depressed. If
the switch is depressed until the spoiler is fully retracted,
a short beep will be heard, and automatic control will be
reestablished.