3.
Where the separate technical unit or component to be type-approved performs its function or displays a specific characteristic only in conjunction with other components of the vehicle and for this reason compliance with one or more requirements can be verified only when that separate technical unit or component to be approved functions in conjunction with other vehicle components whether real or simulated, the scope of the type-approval of that separate technical unit or component must be restricted accordingly. The type-approval certificate for a separate technical unit or component shall then set out any restrictions on use and any instructions for fitting it. Compliance with these restrictions and requirements shall be verified when the vehicle is type-approved.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-06 · Text as adopted (Official Journal); later amendments are not incorporated in this text.