ISO 16750-4: Climatic Load Testing for Automotive Electrical and Electronic Equipment

ISO 16750-4 is primarily used in the automotive industry and applies to electrical and electronic components and systems intended for use in road vehicles, including:

• Electronic Control Units (ECUs)
• Sensors and actuators
• Lighting systems including LED drivers and control modules
• Infotainment and telematics systems
• EV and HV battery management systems
• Charging system components
• ADAS and safety critical control modules
• Body electronics and comfort systems

ISO 16750-4 encompasses a set of climatic/simulated environmental tests. The following outlines the primary test categories:

• Temperature Tests: These tests assess component performance across the range of temperatures encountered during storage, transport, and operation. Key evaluations include Low temperature storage tests, High temperature storage tests, Temperature step tests, and Temperature cycling tests.
• Humidity and Moisture Tests: These tests evaluate the ability of components to withstand moisture related stress in a range of forms. Tests include Damp heat cyclic testing, condensation tests, and damp heat cyclic test
• Cold Water Shock Tests: The purpose of the test is to simulate the thermal shock induced by cold water splashing over a hot system/component. The methods stated are Splash Water Test and Submersion Test.
• Salt Spray and Corrosion Tests: These tests evaluate the resistance of materials, surface coatings, and enclosures to corrosion from road salt and winter driving conditions.
• Solar Radiation Test: This test simulates the use of the systems/components in an environment with long term exposure to solar radiation. This test is applied to surface treatment, paint marking, and labelling pasted on the surface of systems/components mounted in places affected by solar radiation.
• Dust Test: Dust testing simulates a dust pumping effect caused by temperature changes inside the housing of the unit under test due to intermittent electrical operation. Testing is carried out oriented as mounted in the vehicle and consists of 20 cycles, conducted in accordance with ISO 20653.
• Atmospheric Pressure Test: This test simulates an electric phenomenon known as "electric discharge", particular to high voltage use under low atmospheric pressure.

Successful completion of ISO 16750-4 climatic load testing confirms that a component can withstand the temperature, humidity, corrosion, and moisture conditions associated with its intended installation location and vehicle service life. Test results support OEM qualification documentation, supplier approval processes, and internal design validation records, providing a credible, accredited basis for product release decisions.