Ford ED-94 Wiring Harnesses and Electronic Control System (EDS) Requirements

The “Ford ED-94 Wiring harnesses and electronic control system (EDS) requirements” standard developed by Ford Motor Company describes the cable harnesses and electronic control system (EDS) requirements and test methods.

Wire harnesses and electronic monitoring system (EDS) components packaged as a group at the vehicle location, 475 mm or less away from heat sources of 100 degrees or higher, must meet these conditions:

• It can self-extinguish within 300 seconds after the flame is removed, with a maximum burning distance of 30 mm from the flame application point. If the wiring harness or EDS components become exhausted during the test, resulting in the flame going out, this is not considered self-extinguishing. It is also necessary to prevent flaming drips.
• External coverings, interior of enclosures, shields, troughs, brackets and similar equipment shall not collect more than 5 ml of standing liquid. Absorption is not considered standing liquid.

The list of liquids to be tested is included in the standard. Fluid specifications are derived from applicable Ford performance standards for the coating or electronic monitoring system (EDS). An acceptable alternative can be obtained from the specifications for fluids listed in standard ISO 6722-1.

If a listed fluid has proven to be the worst case for the fluid resting on the particular electronic monitoring system (EDS) coating or component under test, then it may be used in place of the remaining fluids.

Fluids to be tested include: engine coolant, engine oil, AC compressor oil, windshield washer fluid, gasoline, diesel, ethanol, transmission oil, brake fluid, and coolant.

Clearance measurements shall be taken at worst case design and construction tolerances that include the use of clearance envelopes. If the clearance envelope is 100 mm or less from the heat source specified above, then all EDS components and coatings in the area must comply with this design rule.

In addition, the in-scope parts described above must also meet the relevant existing flammability performance requirements.

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