The vehicle transmits radio waves to locate the smart entry remote when locking/ unlocking the doors and fuel fill door, opening the trunk, or starting the engine.
In the following cases, locking/unlocking the doors, opening the trunk, or starting the engine may be inhibited or operation may be unstable:
Low Smart Entry Remote Signal Strength*
Communication between the smart entry remote and the vehicle consumes the smart entry remote’s battery.
Battery life is about two years, but this varies depending on regularity of use.
The battery is consumed whenever the smart entry remote is receiving strong radio waves. Avoid placing it near electrical appliances such as televisions and personal computers.
Honda Civic Owners Manual. Continuously variable transmission models
Change the shift position in accordance with your driving needs.
Shift lever positions
Shifting
You cannot turn the ignition switch to LOCK 0
and remove the key unless the shift lever is in P.
The vehicle may move forward very slightly even in
N while the engine is cold. ...