WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
Turn off the PSD from the roof console switch bank.
Fig 1: View Of Power Sliding Door (PSD) Open/Close Pillar Switch
Courtesy of GENERAL MOTORS CORP.
Remove the PSD OPEN/CLOSE switch from the center pillar.
Disconnect the electrical connector from the PSD OPEN/CLOSE switch.