61 13... Inline plugs, 3-, 6-pin, System Elo-Power 2.8
WARNING: This page is about a different car, the 2019 MINI Cooper, 2018 MINI Cooper, 2017 MINI Cooper, 2016 MINI Cooper, and 2015 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.
Press locking hooks (1) in arrow direction and disengage. Then unlock locking hooks (2) and remove locking mechanism.
Press down safety catch with screwdriver (1) and pull out cable with contact towards rear.