The heated steering wheel button is on the climate controls.
Press the button to switch the heated steering wheel on and off.
You can use the heated steering wheel only when the engine is running.
The system uses a sensor and is designed to control the temperature of the steering wheel and to prevent it from overheating.
In warm temperatures, the steering wheel quickly reaches its maximum temperature and the system reduces the current to the heating element. This could cause you to think that the system has stopped working but it has not. This is normal.