WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Connect the electrical connector.
Install the door jamb switch to the rear door hinge-pillar.
Connect the battery negative cable.
Fig 1: Installing Door Jamb Switch To Rear Door Hinge-Pillar