Models with smart entry system
Push up the release button on the trunk lid after the doors are unlocked.
When You Cannot Open the Trunk
Even if the trunk is locked, you can open the trunk if you carry the smart entry remote.
Using the Trunk Release Button
Models with smart entry system
Honda Civic Service Manual. Fuel Fill Door Switch Removal and Installation (Natural Gas models)
1.
Vehicle Lift
1.
Raise the vehicle on a lift, and make sure it is securely
supported.
2.
Rear Wheel
...