Fig. 156 Pin assignment for the trailer socket (illustration).
First read and observe the introductoryinformation and safety warnings
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Introduction
Pin assignment for the trailer socket
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Fig. 156 :
Left turn signal
Rear fog light
Earth for pins 1, 2, 4, 5, 6, 7, 8
Right turn signal
Tail light, right
Brake light
Tail light, left
Reversing light
Permanent positive
Permanent positive
Earth for pin 10
Not assigned
Earth for pin 9
Trailer socket
A 13-pin trailer socket produces the electrical connection between the towing vehicle and the trailer.
When the vehicle electrically detects a trailer, the consumers in the trailer are supplied with an
electrical voltage via the electrical connection (pins 9 and 10). Pin 9 is assigned as the permanent
positive, enabling operation of the trailer interior lighting, for example.
Electrical consumers such as a caravan refrigerator are supplied with power only when the engine is
running (pin 10).
To avoid overloading the electrical system, do not connect the earth wires (pins 3, 11 and 13) with
each other.
If the trailer has a 7-pin plug you will need to use a suitable adapter cable. The function of pin 10 is
then not available.
