All Civic body styles with the trim of EX and up (EX, EX-L, Sport Touring) and the CVT (so not Type-R or Si) came standard with the remote start for the USDM.
The remote start will not work if the factory alarm isn't armed, so if there is a door sensor anywhere (including the hood and fuel door) that is not showing the BCM "CLOSED", the alarm will not arm and the remote start will not operate. Lock the doors with the key fob and look to the instrument panel to see whether the red security LED is flashing. If it is not, the security system is not arming and the remote start will not operate.
Mike