We have a 2013 CTS wagon with a dead battery, so the liftgate will not open. The owners manual and everything shown on U-tube is for CTS's with a "real" trunk, which has a lever above the rear seat pass through and the "Emergency Trunck Release Handle" on the back wall of the trunk that glows in the dark. Well, it doesn't glow bright enough to find on this wagon, as it not there. What obviously simple "trick" am I missing..??