Vehicle Standard (Australian Design Rule 38/03 – Trailer Brake Systems) 2007
3. ANTILOCK SYSTEM - ELECTRICAL SYSTEM.3. ANTILOCK SYSTEM - ELECTRICAL SYSTEM.
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3. ANTILOCK SYSTEM - ELECTRICAL SYSTEM.
3.1 ‘Antilock Systems’ must be powered by a 12 or 24 volt electrical supply system, through a connection to the towing vehicle, using a connector conforming to DIN Standard 72570 configured for 12 volt operation or ISO/DIN7638:1996 configured for 12 or 24 volt operation. If configured for 24 volt operation, the voltage must be marked on the plug.
3.2 The connector must be wired to have the following functions:
3.2.1 For trailers with a 12 volt system:
Pin 1 +ve high current trailer solenoid valve supply, 20 amps minimum rated capacity 30 amps peak capacity
Pin 2 +ve low current trailer electronic unit supply, 4 amps minimum rated capacity
Pin 3 -ve low current trailer electronic unit supply, 6 amps minimum rated capacity
Pin 4 -ve high current trailer solenoid valve supply, 20 amps minimum rated capacity 30 amps peak capacity
Pin 5 trailer ‘Antilock System’ failure, switched to -ve (eg pin 3 or pin 4) upon fault detection, 2 amps minimum rated capacity
3.2.2 For trailers with a 24 volt system:
Pin 1 +ve high current trailer solenoid valve supply, 10 amps minimum rated capacity 15 amps peak capacity.
Pin 2 +ve low current trailer electronic unit supply, 2 amps minimum rated capacity
Pin 3 -ve low current trailer electronic unit supply, 3 amps minimum rated capacity
Pin 4 -ve high current trailer solenoid valve supply, 10 amps minimum rated capacity 15 amps peak capacity
Pin 5 trailer ‘Antilock System’ failure, switched to -ve (eg pin 3 or pin 4) upon fault detection, 1 amp minimum rated capacity
3.3 Any break in the supply of electricity to an ‘Antilock System’ and any electrical failure of an ‘Antilock System’ other than a failure of one or all of the electrical conductors between pins 3, 4 and 5 on the electrical connector and the antilock control module must be signalled to the towing vehicle by connecting Pin 5 on the electrical connector to -ve (ie pin 3 or pin 4).
3.4 Each ‘Antilock System’ must connect pin 5 to -ve (eg pin 3 or pin 4) when initially energised and disconnect pin 5 from -ve after not less than 2 seconds or at the latest when the trailer reaches a speed of 15 km/h and no defect is present.