Overview
ISO 3469:1989 - "Passenger cars - Windscreen washing systems - Test methods" defines standardized laboratory and bench/vehicle procedures to verify the functioning of windscreen (windshield) washing systems fitted to passenger cars. This second edition (1989) replaces ISO 3469:1975 and specifies test fixtures, environmental conditions, test mixtures and procedural steps. The standard provides test methods only - it does not prescribe reference performance levels or acceptance criteria. Annexes A, B and C are normative (integral); Annex D is informative.
Key topics and technical requirements
- Scope & intent: Procedures to assess directional delivery of washer solution, system functioning across temperature ranges, and combined washing + wiping effectiveness. Reference areas/acceptance levels are not given.
- Test equipment: Test fixture or complete test vehicle, environmental chambers for climatic conditioning, wiper-cycle counters and nozzle/assembly mounting representative of vehicle installation.
- Climatic and exposure tests:
- Ambient conditioning at 20 °C ±2 °C (soak/time requirements).
- Freeze exposure: −18 °C ±3 °C for defined periods (typically 8 h) and freeze‑thaw cycling.
- High temperature exposure: 60 °C ±3 °C for defined periods; engine-compartment‑mounted parts may be tested at 80 °C ±3 °C.
- Pump operating force and actuation: Tests use the pump control force specified by the vehicle manufacturer but not exceeding the standard table (example values in the standard: hand 135 N, foot 445 N; actuation timing also prescribed).
- Test mixtures and surface contamination (Annex A & C):
- Specified test dust compositions and a saline/dust test mixture for washing/wiping performance.
- Low-temperature washer solution defined as 50% ethyl alcohol / 50% water.
- Performance measurement (Annex B): Method for measuring washed/wiped (cleared) area - apply standard deposit, dry, operate washing + wiping sequence (up to 10 cycles or 1 min), then determine cleared percentage of specified target area.
Practical applications and users
- Vehicle manufacturers validating washer system design and installation.
- Component suppliers (pumps, nozzles, reservoirs) conducting acceptance or R&D testing.
- Automotive test laboratories performing environmental and system-function tests.
- Type-approval, homologation or safety engineers who need consistent test procedures across climatic ranges.
- Design engineers using standardized test methods to compare alternative designs or additives.
Related standards
Keywords: ISO 3469, windscreen washing systems, test methods, automotive standards, washer pump force, climatic testing, test mixture, washed/wiped area.
