Locking the door using key fob horn is very faint?

If the horn sound when locking the door with your key fob is faint, it could be due to a weak battery in the key fob or the car's horn itself. Consider replacing the battery in the fob first, as this is the simplest solution. If the problem persists, it may be worth checking the car's horn and electrical connections to ensure everything is functioning properly. If needed, consult your vehicle's manual or a professional mechanic for further assistance.