What action must be taken when an investigation of a suspected violation is initiated?

When an investigation of a suspected violation is initiated, filing a written complaint is essential because it provides a formal and documented basis for the investigation to proceed. This complaint typically outlines the specific allegations or concerns and helps to ensure that the investigation is focused and systematic. It serves as a critical first step, allowing the appropriate regulatory bodies or authorities to understand the nature of the suspected violation clearly.

The other options do not fulfill this foundational requirement. Pausing all dealership operations may not be necessary or practical, as it could disrupt business without substantiated evidence. Initiating a public hearing is a procedural step that may occur after an investigation but is not the starting point of the process. Conducting an internal review is important for a dealership to assess potential issues, but without a formal complaint, there would not be a directed investigation by external authorities. Thus, the written complaint is pivotal for initiating and legitimizing the investigation process.