EDIT: i figured it out

The light sensor is built into the rain sensor...but the windshiield only provides a place for the sensor...the sensor is NOT built into the windshield.

When you look up the rain sensor...it lists two components...a rain sensor...and a rain & light sensor (interestingly that starts with the 10/2001 build date). Checkout the link and diagram below (used your VIN)):

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