What does your manual say? I believe the subject
is covered on page 71 of the 2005 manual.

The rain sensor automatically controls the wiper operation as a function of the rain intensity. It is positioned on the windshield, directly in front of the inte- rior rearview mirror.
To activate the rain sensor: Move the lever to position 1 as of igni- tion key position 1. The wipers travel once across the windshield, regardless of the weather conditions.
You can leave the lever permanently in position 1. It is then only necessary to activate the rain sensor as of ignition key position 1.
To do this, turn serrated dial 7 briefly

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