Unlocking the tailgate using the key's button
There is a specific button on the key for unlocking only the tailgate.
Press the 
button on the key.
button on the key.The tailgate will be unlocked but remain closed.
The side doors remain locked and armed. The lock and alarm indicator on the dashboard will go out to indicate that the vehicle is no longer fully locked.
The tailgate can be opened by grasping the rubberized button under the lower edge of the trunk lid.
If the tailgate is not opened within 2 minutes, it will be relocked and the alarm armed.
Power tailgate*
Press and hold the button on the key (for about 1.5 seconds).
button on the key (for about 1.5 seconds).The tailgate will unlock and open. However, the side doors will remain locked and armed.