WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
J 39232 Wiper Linkage Separator
J 39529 Wiper Linkage Installer
Fig 1: Disconnecting Wiper Transmission From Wiper Motor Crank Arm Using Wiper Linkage Separator