See also:

Trunk Release
To open the trunk, press on the Remote Keyless Entry (RKE) transmitter or press the touchpad under the vehicle emblem. See Trunk  for additional information. ...

Cellular and GPS Antennas
Avoid placing items over or near the antenna to prevent blocking cellular and GPS signal reception. Cellular reception is required for OnStar to send remote signals to the vehicle. ...

Removing the Spare Tire and Tools
The equipment you will need is located in the trunk. 1. Open the trunk. See Trunk. 2. Turn the center retainer counterclockwise to remove it. 3. Lift and remove the compact spare tire cover ...