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Pin 2 (54G)

According to [DIN 72552] pin 54G was initially intended for electrical control of brakes on trailers.[13]

Later pin 2 (54G) has been used for a variety of other stuff different from the original intent. A few examples:

+12V permanent.
+12V via ignition lock.
Rear fog lamps.
Reversing lamps.

This is the reason why you in Europe or other region using this connector sometimes can see some trailers on the road with the rear fog lights on. (Vehicle wired for +12V, permanent or via ignition and trailer wired for fog lamps)

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