Resetting the Power Tailgate Control Unit
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
If the battery terminal is disconnected or No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box is removed while the power tailgate is operating, the power tailgate will not be able to open or close automatically until it is reset. To reset the system, fully close the tailgate manually. Once the battery terminals are reconnected or No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box is replaced, the power tailgate system will automatically reset. Make sure the power tailgate operates properly.