ISO Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 4: Climatic loads. ISO applies to electrical and electronic systems/components for road vehicles. ISO describes the potential environmental stresses . INTERNATIONAL STANDARD ISO Third edition Road vehicles — Environmental conditions and testing for electrical and.

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Contraintes climatiques Reference number ISO In accordance with Adobe’s licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe’s licensing policy. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing.

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The work of preparing International Standards is 16750–4 carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

The main task of technical committees is to prepare International Standards.

Develop, test and integrate batteries according to the standards

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Attention is drawn to the possibility that some of the elements of this document may be the izo of patent rights.

ISO shall not be held responsible for identifying any or all such patent rights. This third edition cancels and replaces the second edition ISO ISO consists of the following parts, under the general title Road vehicles — Environmental conditions and testing for electrical and electronic equipment: Electrical loads Part 3: Mechanical loads Part 4: Climatic loads Part 5: This part of ISO describes climatic loads.

For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. ISORoad vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 1: General ISORoad vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 2: Tests — Test A: Tests — Test B: Tests — Test Ka: Tests — Test N: Tests — Test Db: Tests — Test Kb: Tests — Test Ke: Tests — Test Cab: Damp heat, steady state?


The paint repair temperature, TmaxPR, can be higher than the operating temperature and shall be given in the specification of the DUT. An applicable test shall be agreed between supplier and vehicle manufacturer. Failure mode is insufficient frost resistance, e. The operating mode of the DUT is 1. Failure mode is electrical malfunction caused by low temperature, e.

The operating mode of the DUT is 3. Failure mode is insufficient heat resistance, e. Failure mode is electrical malfunction caused by high temperature, e. Use operating mode 3. Figure 1 illustrates the temperature step test, using code Q as specified in Table 1.

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Wait at each step until the DUT has reached the new temperature. Perform functional tests operating mode 3. Switch the DUT off during transition to the next temperature. Failure mode is electrical malfunction during temperature change. NOTE This test is not intended to be a life test. Operate the DUT electrically functional test after the whole device has reached Tmin for the shortest possible duration in order to check the correct function of the device.

In addition, operate it electrically between min and min of the cycle see Figure 2. The changes in temperature shall correspond to the specifications given in Table 2. For tests including hotsoak temperature, TmaxHS, see Table 3.

Figure 3 illustrates the temperature cycle with hot-soak phase, using code F as specified in Table 1. A permanent operation starting at Tmin would prevent this due to the electrical power dissipation. Additional drying of the test chamber air is not permitted.

Perform 30 test cycles as specified. In the vehicle environment, some equipment might experience different conditions regarding temperatures, temperature gradients and duration: The acceleration is possible due to a much higher temperature change rate and a bigger temperature change in one cycle in comparison with real vehicle stress. Failure modes are cracking of materials or seal failures caused by ageing and different temperature expansion coefficients.

Because this test creates mechanical defects crackselectrical operation is not required. Raise the temperature from Tmin to Tmax within 30 s or less.

The soak time can be agreed between customer and supplier, or the exposure time can be chosen among the values 20 min, 40 min, 60 min or 90 min, depending on its size and other properties of the DUT.

Use operating mode 1. See Table 4 for the number of cycles.


Upon agreement, this test may be performed during the development of a DUT sio opened housing or without housing. This happens when driving on wet roads during the winter. Failure modes are mechanical cracking of materials or seal failures caused by different temperature expansion coefficients. An additional failure mode not addressed in 5. There are two possible methods for performing the test see 5.

NOTE This is not a corrosion test. Then splash the DUT with ice water for 3 s. If the DUT is splashed in the vehicle from only one direction, splash it from this direction only while it is in an as-installed position.

If the equipment is splashed from various directions in the vehicle, then these directions shall be taken into account. In this case, use a new DUT for each splash direction. If the DUTs to be splashed prove too big for one jet, arrange several jets in a row to produce a line of splash impact on the DUT. See Figures 4 to 6. It is permissible to add substances such as colours or salt to the water in order to improve the detectability. Figure 5 — Test cycle for splash water test Dimensions in millimetres Key 1 2 3 DUT slot jet pump 4 5 splash water splash Figure 6 — Test set-up for splash water test 10?

Operate the DUT in a hot air oven at Tmax for the specified holding time, th. With the device still operating, submerge it for 5 min in an ice water tank at least 10 mm deep. This test generates corrosion similar to reality. Failure mode is corrosion.

Visual examination as detailed below shall allow identification, appearance, workmanship and finish of the item to be checked against the relevant specification. Select a severity from Table 4 and Annex A. Carry out a visual examination with the naked eye, at isk strength of vision, with normal colour perception, at the most favourable distance and with suitable illumination.

The minimum 17650-4 status shall be class C, as defined in ISO Failure mode is electrical malfunction due to leakage currents caused by the ingress of salt water. The duration of one cycle is 24 h.

Spray the DUT for 8 h, then stop spraying for a rest period of 16 h. Operate the DUT with operating mode 3.

Key t a b c d e time, in h Operating mode 3. Figure 7 — Test cycle for the salt spray test 5. Functional status class A is required in phases with electrical operation mode 3. The failure modes addressed are electrical malfunction s caused by moisture, e. Perform a functional test 16750-44 mode 3.