If the keyless remote battery or the vehicle battery is dead, use the key instead of the keyless remote.
Fully insert the key and turn it.
Locking/Unlocking the Doors Using a Key
When you lock the driver’s door with a key, all the other doors lock at the same time. When unlocking, the driver’s door unlocks first. Turn the key a second time within a few seconds to unlock the remaining doors.
Models with driver information interface
You can customize the door unlock mode setting.
Customized Features
Honda Civic Service Manual. Rear Door Glass Outer Weatherstrip Removal and Installation
(4-door)
8241F0 LEFT
8251F1 RIGHT
Removal
1.
Rear Door Power Window Switch Panel
1.
...