{ "url": "https://openlegislation.uk/eu-regulation-2015-68/annex-XII/appendix-2", "json_url": "https://openlegislation.uk/eu-regulation-2015-68/annex-XII/appendix-2.json", "legislation": "eur/2015/68", "legislation_title": "Commission Delegated Regulation (EU) 2015/68 of 15 October 2014 supplementing Regulation (EU) No 167/2013 of the European Parliament and of the Council with regard to vehicle braking requirements for the approval of agricultural and forestry vehicles (Text with EEA relevance)", "legislation_url": "https://openlegislation.uk/eu-regulation-2015-68", "path": "annex/XII/appendix/2", "kind": "appendix", "number": "2", "heading": null, "text": "Test procedure to assess the functional compatibility of vehicles equipped with electric control lines\n1.\nGeneral\n1.1.\nThis Appendix lays down a procedure that may be used by the Technical Service to check tractors and towed vehicles equipped with an electric control line against the functional and performance requirements referred to in point 2.2. of Annex XII.\n1.2.\nThe references to ISO 7638 within this Appendix apply to ISO 7638-1:2003 for 24V applications and ISO 7638-2:2003 for 12V applications.\n2.\nTractors\n2.1.\nISO 11992 towed vehicle simulator\nThe simulator shall:\n2.1.1. Have a connector meeting ISO 7638:2003 (7 pin) to connect to the vehicle under test. Pins 6 and 7 of the connector shall be used to transmit and receive messages complying with ISO 11992:2003 including ISO 11992-2:2003 and its Amd.1:2007;\n2.1.2. Be capable of receiving all of the messages transmitted by the motor vehicle to be type approved and be capable of transmitting all towed vehicle messages defined within ISO 11992-2:2003 and its Amd.1:2007;\n2.1.3. Provide a direct or indirect readout of messages, with the parameters in the data field shown in the correct order relative to time; and\n2.1.4. Include a facility to measure coupling head response time in accordance with point 2.6 of Annex III.\n2.2.\nChecking procedure\n2.2.1.\nConfirm that the manufacturer's/supplier's information document demonstrates compliance with the provisions of ISO 11992 with respect to the physical layer, data link layer and application layer.\n2.2.2.\nCheck the following, with the simulator connected to the motor vehicle via the ISO 7638 interface and whilst all towed vehicle messages relevant to the interface are being transmitted:\n2.2.2.1.\nControl line signalling:\n2.2.2.1.1. The parameters defined in EBS 12 byte 3 of ISO 11992-2:2003 and its Amd.1:2007 shall be checked against the specification of the vehicle as follows:\nThis specification of vehicle is prohibited following point 2.1.4.1.3 of Annex I.\nControl Line Signalling\nEBS 12 Byte 3\nBits 1-2\nBits 5-6\nService braking demand generated from one electrical circuit\n00b\nService braking demand generated from two electrical circuits\n01b\nVehicle is not equipped with a pneumatic control line\n00b\nVehicle is equipped with a pneumatic control line\n01b\n2.2.2.2.\nService/Secondary brake demand:\n2.2.2.2.1 The parameters defined in EBS 11 of ISO 11992-2:2003 and its Amd.1:2007 shall be checked as follows:\nOptional on tractors with electric and pneumatic control lines when the pneumatic control line fulfils the relevant requirements for secondary braking.\nTest condition\nByte reference\nElectrical control line signal value\nService brake pedal and secondary brake control released\n3 - 4\n0\nService brake pedal fully applied\n3 - 4\n33280d to 43520d (650 to 850 kPa)\nSecondary brake fully applied\n3 - 4\n33280d to 43520d (650 to 850 kPa)\n2.2.2.3.\nFailure warning:\n2.2.2.3.1. Simulate a permanent failure in the communication line to pin 6 of the ISO 7638 connector and check that the yellow warning signal specified in point 2.2.1.29.1.2 of Annex I is displayed.\n2.2.2.3.2. Simulate a permanent failure in the communication line to pin 7 of the ISO 7638 connector and check that the yellow warning signal specified in point 2.2.1.29.1.2 of Annex I is displayed.\n2.2.2.3.3. Simulate message EBS 22, byte 2 with bits 3 - 4 set to 01b and check that the warning signal specified in point 2.2.1.29.1.1 of Annex I is displayed.\n2.2.2.4.\nSupply line braking request:\nFor power-driven vehicles which can be operated with towed vehicles connected via an electric control line only:\nOnly the electric control line shall be connected.\nSimulate message EBS 22, byte 4 with bits 3 - 4 set to 01b and check that when the service brake, secondary brake or parking braking system is fully actuated the pressure in the supply line falls to 150 kPa within the following two seconds.\nSimulate a continuous absence of data communication and check that when the service brake, secondary brake or parking braking system is fully actuated the pressure in the supply line falls to 150 kPa within the following two seconds.\n2.2.2.5.\nResponse time:\n2.2.2.5.1. Check that, with no faults present, the control line response requirements laid down in point 2.6. of Annex III are met.\n2.2.2.6.\nIllumination of stop lamps\nSimulate message EBS 22 byte 4 bits 5 to 6 set to 00 and check that the stop lamps are not illuminated.\nSimulate message EBS 22 byte 4 bits 5 to 6 set to 01 and check that the stop lamps are illuminated.\n2.2.3.\nAdditional checks\n2.2.3.1.\nAt the discretion of the Technical Service the checking procedures laid down in points 2.2.1 and 2.2.2 may be repeated with the non-braking functions relevant to the interface in different states or switched off.\n2.2.3.2.\nPoint 2.4.1. of Appendix 1 defines additional messages that shall under specific circumstances be supported by the tractor. Additional checks may be carried out to verify the status of supported messages to ensure the requirements of point 2.3 are fulfilled.\n3.\nTowed vehicles\n3.1.\nISO 11992 tractor simulator\nThe simulator shall:\n3.1.1. Have a connector meeting ISO 7638:2003 (7 pin) to connect to the vehicle under test. Pins 6 and 7 of the connector shall be used to transmit and receive messages complying with ISO 11992:2003 including ISO 11992-2:2003 and its Amd.1:2007;\n3.1.2. Have a failure warning display and an electrical power supply for the towed vehicle;\n3.1.3. Shall be capable of receiving all of the messages transmitted by the towed vehicle to be type approved and be capable of transmitting all motor vehicle messages defined within ISO 11992-2:2003 and its Amd.1:2007.\n3.1.4. Provide a direct or indirect readout of messages with the parameters in the data field shown in the correct order relative to time; and\n3.1.5. Include a facility to measure brake system response time in accordance with point 4.5.2 of Annex III.\n3.2.\nChecking procedure\n3.2.1.\nConfirm that the manufacturer's or supplier's Information Document, demonstrates compliance with the provisions of ISO 11992:2003 including ISO 11992-2:2003 and its Amd.1:2007 with respect to the physical layer, data link layer and application layer.\n3.2.2.\nCheck the following, with the simulator connected to the towed vehicle via the ISO 7638 interface and whilst all tractor messages relevant to the interface are being transmitted:\n3.2.2.1.\nService brake system function:\n3.2.2.1.1.\nThe towed vehicle response to the parameters defined in EBS 11 of ISO 11992-2:2003 and its Amd.1:2007 shall be checked as follows:\nThe pressure in the supply line at the start of each test shall be ≥ 700 kPa and the vehicle shall be laden (the loading condition may be simulated for the purpose of this check).\n3.2.2.1.1.1.\nFor towed vehicles equipped with pneumatic and electric control lines:\nBoth control lines shall be connected;\nBoth control lines shall be signalled simultaneously;\nThe simulator shall transmit message byte 3, bits 5-6;\nOf EBS 12 set to 01b to indicate to the towed vehicle that a pneumatic control line should be connected.\nParameters to be checked:\nMessage transmitted by the simulator\nPressure at the brake chambers\nByte reference\nDigital demand value\n3-4\n0\n0 kPa\n3-4\n33280d\n(650 kPa)\nAs defined in the vehicle manufacturer's brake calculation\n3.2.2.1.1.2.\nTowed vehicles equipped with pneumatic and electric control lines or an electric control line only:\nOnly the electric control line shall be connected\nThe simulator shall transmit the following messages:\nByte 3, bits 5-6 of EBS 12 set to 00b to indicate to the towed vehicle that a pneumatic control line is not available, and byte 3, bits 1-2 of EBS 12 set to 01b to indicate to the towed vehicle that the electric control line signal is generated from two electric circuits.\nParameters to be checked:\nMessage transmitted by the simulator\nPressure at the brake chambers\nByte reference\nDigital demand value\n3-4\n0\n0 kPa\n3-4\n33280d\n(650 kPa)\nAs defined in the vehicle manufacturer's brake calculation\n3.2.2.1.2.\nFor towed vehicles equipped with only an electric control line, the response to messages defined in EBS 12 of ISO 11992-2:2003 and its Amd.1:2007 shall be checked as follows:\nThe pneumatic supply line at the start of each test shall be ≥ 700 kPa.\nThe electric control line shall be connected to the simulator.\nThe simulator shall transmit the following messages:\nByte 3, bits 5-6 of EBS 12 set to 01b to indicate to the towed vehicle that a pneumatic control line is available.\nByte 3-4 of EBS 11 shall be set to 0 (no service brake demand)\nThe response to the following messages shall be checked:\nEBS 12, Byte 3, Bit 1-2\nPressure in the brake chambers or reaction of the towed vehicle\n01b\n0 kPa (service brake released)\n00b\nThe towed vehicle is automatically braked to demonstrate that the combination is not compatible. A signal should also be transmitted via Pin 5 of the ISO 7638:2003 connector (yellow warning).\n3.2.2.1.3.\nFor towed vehicles connected with only an electrical control line, the response of the towed vehicle to a failure in the electric control transmission of the towed vehicle which results in a reduction in braking performance to at least 30 % of the prescribed value shall be checked by the following procedure:\nThe pneumatic supply line at the start of each test shall be ≥ 700 kPa.\nThe electric control line shall be connected to the simulator.\nByte 3, bits 5-6 of EBS 12 set to 00b to indicate to the towed vehicle that a pneumatic control line is not available.\nByte 3, bits 1-2 of EBS 12 set to 01b to indicate to the towed vehicle that the electric control line signal is generated from two independent circuits.\nThe following shall be checked:\nTest condition\nBraking system response\nWith no faults present in the towed vehicle braking system\nCheck that the braking system is communicating with the simulator and that Byte 4, bits 3-4 of EBS 22 is set to 00b.\nIntroduce a failure in the electric control transmission of the towed vehicle braking system that prevents at least 30 per cent of the prescribed braking performance from being maintained\nCheck that Byte 4, bits 3-4 of EBS 22 is set to 01b\nor\nThe data communications to the simulator has been terminated\n3.2.2.2.\nFailure warning\n3.2.2.2.1.\nCheck that the appropriate warning message or signal is transmitted under the following conditions:\n3.2.2.2.1.1. Where a permanent failure within the electric control transmission of the towed vehicle braking system precludes the service braking performance being met, simulate such a failure and check that byte 2, bits 3-4 of EBS 22 transmitted by the towed vehicle is set to 01b. A signal should also be transmitted via pin 5 of the ISO 7638 connector (yellow warning).\n3.2.2.2.1.2. Reduce the voltage on pins 1 and 2 of the ISO 7638 connector to below a value nominated by the manufacturer which precludes the service braking system performance from being fulfilled and check that byte 2, bits 3-4 of EBS 22 transmitted by the towed vehicle are set to 01b. A signal should also be transmitted via pin 5 of the ISO 7638 connector (yellow warning).\n3.2.2.2.1.3. Check compliance with the provisions of point 5.2.4 of this Annex by isolating the supply line. Reduce the pressure in the towed vehicle pressure storage system to the value nominated by the manufacturer. Check that byte 2, bits 3-4 of EBS 22 transmitted by the towed vehicle is set to 01b and that byte 1, bits 7-8 of EBS 23 is set to 00. A signal should also be transmitted via pin 5 of the ISO 7638 connector (yellow warning).\n3.2.2.2.1.4. When the electrical part of the braking equipment is first energised check that byte 2, bits 3-4 of EBS 22 transmitted by the towed vehicle is set to 01b.After the braking system has checked that no defects that require identification by the red warning signal are present the message referred to in this point shall be set to 00 b .\n3.2.2.3.\nResponse time checking\n3.2.2.3.1.\nCheck that, with no faults present, the braking system response time requirements laid down in point 4.5.2 of Annex III are met.\n3.2.2.4.\nAutomatically commanded braking\nIn case the towed vehicle includes a function where its operation results in an automatically commanded braking intervention, the following shall be checked:\nIf no automatically commanded braking intervention is generated, check that message EBS 22 byte 4 bits 5 to 6 are set to 00.\nSimulate an automatically commanded braking intervention, when the resulting deceleration is ≥ 0,7 m/sec2, check that message EBS 22 byte 4 bits 5 to 6 are set to 01.\n3.2.2.5.\nVehicle stability function\nIn the case of a towed vehicle equipped with a vehicle stability function, the following checks shall be carried out:\nWhen the vehicle stability function is inactive, check that message EBS 21 byte 2 bits 1 to 2 are set to 00.\n3.2.2.6.\nSupport of the electric control line\nWhere the towed vehicle braking system does not support braking via the electric control line check that message EBS 22 byte 4 bits 7 to 8 are set to 00.\nWhere the towed vehicle braking system supports the electric control line, check that message EBS 22 byte 4 bits 7 to 8 are set to 01.\n3.2.3.\nAdditional checks\n3.2.3.1.\nAt the discretion of the Technical Service the checking procedures laid down in points 3.2.1 and 3.2.2 may be repeated with the non-braking messages relevant to the interface in different states or switched off.\nWhere repeat measurements of the brake system response time are carried out, variations in the value recorded may occur due to the reaction of the vehicle pneumatics. In all cases the prescribed response time requirements shall be met.\n3.2.3.2.\nPoint 2.4.2 of Appendix 1 defines additional messages that shall under specific circumstances be supported by the towed vehicle. Additional checks may be carried out to verify the status of supported messages to ensure the requirements of point 2.3 of this Annex are fulfilled.", "extent": "E+W+S+N.I.", "status": null, "version": "current", "annotations": [ { "type": "F", "label": "F1", "text": "Substituted by Commission Delegated Regulation (EU) 2016/1788 of 14 July 2016 amending Regulation (EU) No 167/2013 of the European Parliament and of the Council as regards the list of requirements for vehicle EU type-approval, and amending and correcting Commission Delegated Regulations (EU) No 1322/2014, (EU) 2015/96, (EU) 2015/68 and (EU) 2015/208 with regard to vehicle construction and general requirements, to environmental and propulsion unit performance requirements, to vehicle braking requirements and to vehicle functional safety requirements (Text with EEA relevance)." }, { "type": "footnote", "label": "f1", "text": "This specification of vehicle is prohibited following point 2.1.4.1.3 of Annex I." }, { "type": "footnote", "label": "f2", "text": "Optional on tractors with electric and pneumatic control lines when the pneumatic control line fulfils the relevant requirements for secondary braking." } ], "outstanding_effects": [], "provenance": { "source": "legislation.gov.uk", "source_url": "https://www.legislation.gov.uk/eur/2015/68/annex/XII/appendix/2", "retrieved_at": "2026-11-01T14:46:56.586941+00:00" }, "licence": "Open Government Licence v3.0", "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/", "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives." }