BRITISH STANDARD AUTOMOBILE SERIES BS AU 196 1984 Specification for Electrical connections between 24 V trailer antilock braking systems and towing vehicles UDC [629 11 592] 013 5 621 316 541 L ic e n[.]
Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BRITISH STANDARD AUTOMOBILE SERIES Specification for Electrical connections between 24 V trailer antilock braking systems and towing vehicles UD C [62 1 - 592 ] 01 5: 62 31 541 BS AU 196:1984 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 196:1984 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile Standards Committee (AUE/- ) to Technical Committee AUE/1 upon which the following bodies were represented: Association of Trailer Manufacturers Department of Transport Electric Cable Makers’ Confederation National Caravan Council Limited Society of Motor Manufacturers and Traders Limited This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of the Board of BSI and comes into effect on Amendments issued since publication 31 January 984 © BSI 02- 2000 The following BSI references relate to the work on this standard: Committee reference AUE/1 Draft for comment 83/71 01 DC ISBN 580 13544 Amd No Date of issue Comments Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 196:1984 Contents Page Committees responsible Foreword ii Scope Connectors Antilock powering Antilock failure warning System identification Figure — Towing vehicle wiring (24 V) Figure — Trailer or semi- trailer wiring (24 V) Publications referred to © BSI 02- 2000 Inside front cover Inside back cover i Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 96: 984 Fore word This British Standard has been prepared under the direction of the Automobile Standards Committee It is based on information sheet EE- 4R of the Society of Motor Manufacturers and Traders, “SMMT recommended method for powering 24 Volt trailer antilock braking systems” The connections between the towing vehicle and trailer are made through plugs and sockets which are specified in BS AU 97 and BS AU 98 It should be noted that it may be illegal to operate a vehicle on which the antilock system is inoperative A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application C omp liance with a British S tand ard d oe s no t of itse lf confe r immunity from le gal ob ligatio ns S ummary of p age s This document comprises a front cover, an inside front cover, pages i and ii, pages to 4, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 02- 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 96: 984 S cop e Antilock failure warning This British Standard specifies electrical 4.1 connections between towing vehicles and trailers or fitted with a tell- tale that, when lit, indicates Towing vehicles as described in 3.1 shall be semi- trailers when 24 V antilock braking systems defective functioning, defective condition or the are fitted failure to function of the trailer antilock braking NOTE system The publications referred to in this standard are listed on the inside back cover The tell- tale shall be W maximum, red and located in the forward field of vision of the driver and visible C onne ctors even by daylight Towing vehicles and trailers or semi- trailers shall be equipped with a type 24 N (normal) connector that complies with BS AU 97 and a type 24 S function of the antilock braking system The tell- tale shall be W maximum, green and Antilock p owe ring mounted so that it is within the field of vision of the Towing vehicles shall be wired in accordance driver’s mirror and visible even by daylight with Figure when they are fitted with antilock NOTE braking systems or are intended to run with trailers or semi- trailers equipped with antilock braking systems The power supply via pin j The normal power of this tell- tale should be W The circuits described in 4.1 and 4.2 shall also warning tell- tale of the type 24 S connector shall be switched by the main electrical S yste m identification 5.1 The supply can be controlled by a relay, to relieve the main electrical switch of the additional load, which can be an Towing vehicles as described in 3.1 shall carry a label that states that they are wired for trailer antilock braking systems and equipped with an intermittent maximum of A Trailers or semi- trailers equipped with antilock braking systems shall be wired in accordance with Figure NOTE 4.3 include a check mode for the following failure switch in the cab 3.2 3.2, functioning, defective condition or the failure to BS AU 98 NOTE Trailers or semi- trailers as described in tell- tale that, when lit, indicates defective (supplementary) connector that complies with 3.1 4.2 shall be fitted with an antilock failure warning electrical connector wired in accordance with BS AU 96: 984 5.2 This allows for a secondary power source to protect 1) Trailers or semi- trailers equipped with antilock braking systems shall carry a label stating that they antilock operation in the event of loss of the primary feed circuit are fitted with antilock braking systems that are This secondary feed is provided by the stop lamp circuit which is wired in accordance with BS AU 96: 984 connected to pin j NOTE and h of the type 24 N connector When antilock braking systems are not fitted, pins of the type 24 S connector need not be wired NOTE f 5.3 1) The label shall also describe the antilock failure warning tell- tale check procedure It is recommended that the stop lamp circuit is not the sole means of powering the antilock braking system 1) “Marking BS AU 96: 984 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard The accuracy of such a claim is therefore solely the manufacturer’s responsibility Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, Quality Assurace Division, BSI, Maylands Avenue, Hemel Hempstead, Herts HP2 4SQ for certification marks administered by BSI or to the appropriate authority for other certification marks ” © BSI 02- 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI NO TE Figure — Towing vehicle wiring (24 V) C onnections as shown are to indicate princip le of operation only BS AU 96:1 984 © BSI 02 - 000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 96:1 984 NO TE The manufacturer of the antilock control unit should specify the blocking diode The comp onent should b e part of the control unit assembly f and j NO TE When antilock is not fitted p ins NO TE C onnections as shown are to indicate principle of operation only are not wired Figure — Trailer or semi-trailer wiring (24 V) © BSI 02 - 000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI blank Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 196:1984 Publications referred to Specification for electrical connections between towing vehicles and trailers with 24 V electrical equipment: type 24 N (normal) BS AU 97, BS AU 98, Specification for electrical connections between towing vehicles and trailers with 24 V electrical equipment: type 24 S (supplementary) Information sheet EE- 4R 2) “SMMT recommended method for powering 24 Volt trailer antilock braking systems ” (Society of Motor Manufacturers and Traders ) 2) Referred to in the foreword only © BSI 02- 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 57: 50 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 196:1984 BSI — British Standards Institution BS I is the indep endent national b ody res p ons ib le for p rep aring Britis h S tandards It p res ents the UK view on s tandards in E urop e and at the international level It is incorp orated b y Royal C harter Revisions Britis h S tandards are 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