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The Sonic (except LS/Manual) offers a remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The Elantra Sedan doesn’t offer a remote starting system.
The power windows standard on both the Sonic and the Elantra Sedan have locks to prevent small children from operating them. When the lock on the Sonic is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Elantra Sedan prevents the driver from operating the other windows just as it does the other passengers.
The Sonic LT/Premier’s front and rear power windows all open fully with one touch of the switches and its front windows also automatically close, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Elantra Sedan’s power window switches have to be held the entire time to close them fully. Only its driver’s window opens automatically.
The Sonic has a standard automatic headlight on/off feature. When the ignition is on, the headlights automatically turn on at dusk and off after dawn. The Elantra Sedan has an automatic headlight on/off feature standard only on the SEL/Value Edition/Eco/Sport/Limited.
On extremely cold winter days, the Sonic’s optional (except LS/RS) heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The Elantra Sedan doesn’t offer a heated steering wheel.