Lower the back door using either back door handle.
Make sure to push the back door down from the outside to close it.
The back door closing assist will activate and the back door will fully close automatically.

Canceling the power back door system (vehicles with a power back door)
Turn the main switch in the glove box off to disable the power back door system.

Power back door switch (vehicles with a power back door)
Adjusting the open position of the back door (vehicles with a
power back door)Do-it-yourself service
precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
Items
Parts and tools
Battery condition
Warm water
baking soda
grease
conventional wrench (for terminal clamp bolts)
Brak ...