The difference is how they are mechanically keyed. One is used in 24V applications while the other is for ADR use. Other variants of this connector exists but they are rare. The pin remains reserved for future allocation in ISO 11446-1:2012. This function was removed by ISO 11446:2004 and the pin reallocated to reserved. ^ Previously allocated to trailer detection in ISO 11446:2002 (the vehicle could detect it was coupled to a trailer using a link between pin 12 and pin 3 in the trailer plug).^ a b Pin 5 and 7 must not be joined in the trailer to avoid problems in vehicles with separate circuits for left and right side.
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