Final answer:
To check if the 'color' coding works, press the 'Test' button.
Step-by-step explanation:
To check if the 'color' coding works, you would need to push the 'Test' button. This button is specifically designed to test different features or functionalities of a system, such as the color coding. By pressing the 'Test' button, you can determine if the coding has been set up correctly or if there are any errors.