WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Open the rear door.
Use a small flat-bladed tool remove the door jamb switch (2) from the hinge pillar.
Disconnect the electrical connector from the door jamb switch.
Fig 1: Disconnecting Rear Door Jamb Switch Electrical Connector