WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Clean the mounting location on the windshield using a clean lint free cloth with isopropyl alcohol.
Install the rain sensor (1) to the windshield.
Connect the electrical connector to the rain sensor (1).
Fig 1: Connecting Electrical Connector To Rain Sensor