Endgate/Liftgate Window Release
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Pickup, 1999 Chevrolet Tahoe, and 1999 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
Press the REAR 2X button on the transmitter twice, within five seconds, to unlatch the liftgate window. Set the vehicle in Park or Neutral to operate the transmitter.