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The couplings can be made as swivel-nut type or as quick- connector type. 1.6.2.4. It shall be impossible to disconnect the quick-connector type without specific measures or the use of dedicated tools." (...) The couplings can be made as swivel-nut type or as quick- connector type. 2.6.5. It shall be impossible to disconnect the quick-connector type without specific measures or the use of dedicated tools." (...) Compatibility with heat exchange fluids of non metallic parts 17.1. Test samples shall be submerged in heat exchange medium for 168 hours at 90 °C; then they shall be dried for 48 hours at a temperature of 40 °C.

The couplings can be made as swivel-nut type or as quick-connector type. 1.6.2.4. It shall be impossible to disconnect the quick-connector type without specific measures or the use of dedicated tools." (...) The couplings can be made as swivel-nut type or as quick-connector type. 2.6.5. It shall be impossible to disconnect the quick-connector type without specific measures or the use of dedicated tools." (...) Compatibility with heat exchange fluids of non metallic parts 17.1. Test samples shall be submerged in heat exchange medium for 168 hours at 90 °C; then they shall be dried for 48 hours at a temperature of 40 °C.

The towing vehicle is / is not 2 equipped with an electrical connector fulfilling the relevant requirements of Annex 7 7.2. (...) The power supply provided by the connector referenced in paragraph 2.5. below shall be used for the powering of the trailer steering system. (...) Until a uniform standard has been defined the connector used to connect to the trailer shall fulfil the following: (a) The pins shall have a current carrying capacity compatible with the maximum continuous current defined in paragraph 2.3. above; (b) Until uniform standards have been agreed the environmental protection of the connector shall be appropriate to the application and included in the Annex 6 assessment; and (c) The connector shall not be interchangeable with an existing electrical connector currently used on the towing vehicle i.e.

JUSTIFICATION Supplement 5 to the 09 Series of amendments introduced new requirements into paragraph 5.1.3.6., with respect to the use of the electrical energy by the trailer, available through the ISO 7638 connector as follows: The brakes and running gear functions shall be exclusively powered via the ISO 7638 connector. This meant that it was not possible to provide back-up powering from other power sources in the event of a failure within the ISO 7638 connector. In addition it did not prohibit the use of the electrical energy to power non- brakes and running gear functions. (...) This proposal is intended to make clear that electrical energy available via the ISO 7638 connector may be used to power a trailer information system for the purpose of transmitting information.

With pointer instruments, the measuring range shall be such that all readings are made in the upper third of the measuring scale. 1/ This method of measurement has been written for the case in which the socket of the trailer connector is mounted on the towing vehicle. It applies equally to an articulated vehicle in which the socket is mounted on the semi-trailer, for which case, however, the words "plug" and "socket" should be interchanged wherever they refer to a trailer connector (see figure 1 in ISO 3559 – (Date of version: 1976)). (...) On vehicles, which are fitted with a trailer connector socket, these measurements shall be made without an electrical load applied to the connector socket. 4.2.4.2 On vehicles which are fitted with a trailer connector socket, additional measurements shall be made in accordance with ISO 3559 – (Date of version: 1976). 4.3 Measurement of working voltages on trailers 4.3.1 The trailer plug shall be coupled to a test socket conforming to Table 1 below. (...) Table 1: The state of standards is the following: 7 – pole connector, type 12N (normal) ISO 1724, Third edition, 1997 12 V system: 7 – pole connector, type 12S (supplementary) ISO 3732, third edition, 1997 7 – pole connector, type 24N (normal) ISO 1185, Second edition, 1997 24 V system: 7 – pole connector, type 24S (supplementary) ISO 3731, third edition, 1997 12 V system: 13 – pole connector ISO 11 446, Second edition, 1995 24 V system: 15 – pole connector ISO 12 098, First edition, 1994 " * * * TRANS/WP.29/GRE/2003/20/Rev.2 page 7 B.

(b) Environmental protection shall be a minimum of IP 54 (c) The connector shall not be interchangeable with an existing electrical connector currently used on the towing vehicle i.e. (...) The electrically controlled steering system of the trailer shall continue to function at a voltage of [19.2V] measured at the connector interface. 3.3. The nominal operating voltage is 24V 3.4. (...) (b) Environmental protection shall be a minimum of IP 54 (c) The connector shall not be interchangeable with an existing electrical connector currently used on the towing vehicle i.e.

On towing vehicles and trailers with 12 V system the installation of a 13-pole connector ISO 11 446 instead of or in addition to a 7–pole socket and plug is permissible. 5.26.2. On towing vehicles and trailers with 24 V system the installation of a 15-pole connector ISO 12 098 instead of or in addition to a 7–pole socket and plug is permissible. 5.26.3. (...) The state of standards is the following: 12 V system: 7 – pole connector, type 12N (normal) ISO 1724, Third edition, 1997 7 – pole connector, type 12S (supplementary) ISO 3732, Third edition, 1997 24 V system: 7 – pole connector, type 24N (normal) ISO 1185, Second edition, 1997 7 – pole connector, type 24S (supplementary) ISO 3731, Third edition, 1997 12 V system: 13 – pole connector ISO 11 446, Second edition, 1995, Amend. 1, 1997 24 V system: 15 – pole connector ISO 12 098, First edition, Corr.1, 2001 _________