Road vehicles — Windscreen defrosting systems for passenger cars — Test method

This document outlines a standardized test procedure designed for evaluating the defrosting systems of passenger car windshields. It establishes the specific conditions and methodologies required to assess how effectively a vehicle's heating apparatus can clear frost, fog, or ice from the front glass within a given timeframe. The content details the setup of test environments, including temperature control and humidity levels, as well as the instrumentation needed to measure the rate of clearing. Specific instructions are provided regarding the application of artificial ice or condensation to the glass surface and the subsequent activation of the defrosting mechanism. The document further describes the criteria for determining success based on visibility zones and the time elapsed until the designated areas are free of obstruction. By adhering to these uniform guidelines, manufacturers and regulators can ensure consistent performance evaluations across different vehicle models. This approach facilitates comparisons between various defrosting technologies and contributes to the overall safety and operational reliability of vehicles in adverse weather conditions by providing a repeatable framework for verification.