FORD 2013 C-MAX Hybrid v.2 - Manual (Page 81)

Obstacle Detection
When closing: The system will stop when it detects an obstacle and two
short chimes will sound. Once the obstacle is removed the liftgate can be
closed under power.
Note: Entering the vehicle while the liftgate is closing can cause the
vehicle to bounce and activate obstacle detection. To prevent this, allow
the power liftgate to fully close before entering the vehicle. Before
driving off, check the instrument cluster for a liftgate or door ajar
message or warning indicator. Driving off without first checking for the
liftgate or door ajar message or warning indicator could result in the
liftgate being left open, unintentionally, while you are driving.
When opening: The system will stop and two short chimes will sound
when it detects an obstacle. Remove the obstacle to operate the liftgate.
80 Locks
2013 C-Max Full Hybrid (34h)
Owners Guide gf, 2nd Printing
USA (fus)