What is the first step in testing the vehicle's horn?

The first step in testing the vehicle's horn involves sounding the horn itself. This initial action quickly determines if the horn is functioning at all. By directly activating the horn, the inspector can assess whether there is any response, which is critical in evaluating the horn's operational status.

If the horn does not sound, further investigation is warranted, such as checking the actuating device (the steering wheel button or stalk). However, without sounding the horn first, it would be impossible to know if any subsequent steps are necessary or to identify what specific issues might be present, like problems with the wiring or mounting, which are typically explored after determining whether the horn itself operates correctly. Therefore, starting with the act of sounding the horn provides the most direct insight into its functionality.