Honda 2010 Ridgeline Owner's Manual page 16

Protecting Adults and Teens
When one or more doors are open,
the ''DOOR OPEN'' message will
come on.
12
When the In-Bed Trunk is not tightly
closed, the ''TRUNK OPEN''
message will come on.
2010 Ridgeline
When the tailgate is not tightly
closed, the ''TAILGATE OPEN''
message will come on.