Document ID: chunk:federal_register_of_legislation:F2018L01515:body:0:p35
Version: federal_register_of_legislation:F2018L01515
Segment Type: other
Provision Reference: 
Character Range: 99415–102320

Verification and test
4.1. The functional operation of "The System", as laid out in the documents required in paragraph 3., shall be tested as follows:
4.1.1. Verification of the function of "The System"
 As the means of establishing the normal operational levels, verification of the performance of the vehicle system under non-fault conditions shall be conducted against the manufacturer's basic benchmark specification unless this is subject to a specified performance test as part of the approval procedure of this or another Regulation.
4.1.2. Verification of the safety concept of paragraph 3.4.
 The reaction of "The System" shall, at the discretion of the Type Approval Authority, be checked under the influence of a failure in any individual unit by applying corresponding output signals to electrical units or mechanical elements in order to simulate the effects of internal faults within the unit.
4.1.2.1. The verification results shall correspond with the documented summary of the failure analysis, to a level of overall effect such that the safety concept and execution are confirmed as being adequate.

Annex 7
       Special provisions for the powering of trailer steering systems from the towing vehicle
1. General
 The requirements of this annex shall apply to towing vehicles and trailers where electrical energy is supplied from the towing vehicle to facilitate operation of the steering system installed on the trailer.
2. Requirements for towing vehicles
2.1. Energy Supply
2.1.1. The vehicle manufacturer shall define the capacity of the energy source that will enable the current defined in paragraph 2.3. below to be available for the trailer during normal operation of the vehicle.
2.1.2. The driver's manual shall include information to advise the driver on the electrical energy available for the trailer steering system and that the electrical interface shall not be connected when the current requirement marked on the trailer exceeds that which can be supplied by the towing vehicle.
2.1.3. The power supply provided by the connector referenced in paragraph 2.5. below shall be used for the powering of the trailer steering system. However, in all cases the provisions of paragraph 3.3. below shall apply.
2.2. The nominal operating voltage is 24V.
2.3. The maximum current supply available at the connector referenced in paragraph 2.5.2. below shall be defined by the towing vehicle manufacturer.
2.4. Protection of the electrical system
2.4.1. The electrical system of the towing vehicle shall be protected from an overload or short circuit in the supply to the trailer steering system.
2.5. Wiring and Connectors
2.5.1. The cables used to supply the trailer electrical energy shall have a conductor cross-sectional area compatible with the continuous current defined in paragraph 2.3. above.
2.5.2. Until a uniform standard has been defined the connector used to connect