Road vehicles; Rear-window defrosting system for passenger cars; Test method

This technical specification outlines the standardized procedures for evaluating the defrosting and defogging performance of rear windows on passenger cars. The document establishes a uniform methodology to assess how effectively a vehicle's heating system removes frost or condensation from the rear glazing. It details the necessary environmental conditions, such as specific temperature and humidity levels, under which the tests must be conducted to ensure consistency and comparability across different manufacturers and models. The procedure includes requirements for the placement of measuring instruments, the duration of the test cycle, and the criteria for determining a successful outcome. By defining these operational parameters, the specification facilitates a common language for engineering and quality control within the automotive industry. This approach ensures that safety and visibility requirements are met through rigorous, repeatable testing protocols. The focus remains strictly on the experimental methods and performance metrics required to verify that the rear window defrosting system functions as intended under defined cold weather scenarios.