U.S. models
If you replace a flat tire with the spare tire, the low tire pressure/TPMS indicator comes on while you are driving. After driving for a few miles (kilometers), the indicator will start blinking for a short time and then stay on. Tire Pressures Low appears on the driver information interface*, but this is normal.
Calibrate the TPMS when you replace the tire with a specified regular tire.
The system cannot monitor the pressure of the spare tire. Manually check the spare tire pressure to be sure that it is correct.
Honda Civic Owners Manual. Low Smart Entry Remote Signal Strength
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 ...