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Rear 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 makes the electrical connection between the towing vehicle and the trailer.
When the vehicle detects a trailer through the electrics, the consumers in the trailer are supplied
with electrical current via the electrical connection (pins 9 and 10). Pin 9 is assigned as the
permanent live, enabling operation of e.g. interior trailer lighting.
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 inter-connect the three earth wires (pins 3, 11
and 13).
If the trailer has a 7-pin plug you will need to use a suitable adapter cable. Pin 10 is then without
function.
If you are uncertain whether the electrical connection of the trailer with the vehicle is correct, please
contact a qualified workshop. Volkswagen recommends using a Volkswagen dealership for this
purpose.
Connection to the anti-theft alarm
The trailer is integrated in the anti-theft system if the following conditions are fulfilled:
• When the vehicle has a factory-fitted anti-theft alarm and a factory-fitted towing bracket.
• When the trailer is electrically connected to the towing vehicle via the trailer socket.
• When the vehicle and trailer electric systems are functional, fault-free and undamaged.
• When the vehicle is locked with the vehicle key and the anti-theft alarm is active.
When the vehicle is locked, the alarm will be triggered as soon as the electrical connection to the
trailer is interrupted.
Connection to the anti-theft alarm (trailer with LED tail light clusters)
For technical reasons, trailers with LED tail lights cannot be integrated into the anti-theft alarm
system.
When the vehicle is locked, the alarm is not triggered as soon as the electrical connection to the
trailer with LED rear lights is interrupted.
WARNING
Any electrical accessories which are not connected properly could cause a power surge to
the trailer. This could lead to malfunctions in the entire vehicle electronics system and
could also cause accidents and serious injuries.
• All work on the electrical system should only be carried out by a qualified workshop.
• Never connect the trailer's electrical system directly to the electrical connections of the
towing vehicle's tail light clusters or to other power sources.
WARNING
Contact between the pins in the trailer socket can lead to short circuits, overloading of the
electrical system and failure of the lighting system, thereby causing accidents and serious
injuries.
• Never connect the pins in the trailer socket to one another.
• Have bent pins repaired by a qualified workshop.
NOTICE
If you park the trailer using the support wheel or other trailer supports, disconnect the
trailer from the vehicle. The vehicle could rock up and down if the load changes or if there
is damage to the tyres, for example. If this happens, a great deal of force will be exerted on
the towing bracket and trailer, which could lead to damage to the vehicle and trailer.
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