Which component's functionality is verified when inspecting horn operation?

When inspecting horn operation, verifying the sound level is crucial because it ensures that the horn emits an adequate level of sound to be effective in alerting other drivers or pedestrians. The horn is an important safety feature in a vehicle, and its primary purpose is to warn others of the vehicle's presence or to signal danger. If the sound level is too low, it may not be heard in a noisy environment, which could lead to hazardous situations on the road.

While other aspects of the horn's functionality, such as electrical connections, accessibility, and compliance with legal requirements, are important to ensure the horn is in proper working order, they do not directly address how well the horn can perform its main function of alerting others through sound. Therefore, assessing the sound level is essential for confirming that the horn meets safety standards and is capable of performing its intended role effectively.