Acura MDX Owner's Manual page 135

uuOpening and Closing the TailgateuOpening/Closing the Power Tailgate
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Power Tailgate Fall Detection
Automatically lowers the power tailgate when there is a possibility that the fully
opened power tailgate can fall down by its own weight (for example, by snow on
the tailgate). The beeper sounds while the power tailgate lowers.
134
1Power Tailgate Fall Detection
If you try to manually close the power tailgate
immediately after it fully opens, the power tailgate
fall detection may activate.
Once the power tailgate fall detection activates, wait
until the power tailgate fully closes. Keep away from
the power tailgate when it is in motion.
If the power tailgate fall detection constantly
activates, consult at a dealer.