Self-Study Program

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Control units
Trailer detector control unit J345
In addition to activating the trailer lights, the trailer detector control unit J345 controls the electric swivelling
tow attachment.
The electric swivelling tow attachment known from group vehicles can also be retrofitted. In this case, it is
installed as a unit behind the bumper.
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Tasks
– Controlling the electric swivelling tow attachment
– Monitoring the "clutch engaged" position
– Coupled trailer detection
– Activating the trailer's rear lights
– Switching "Terminal 30 trailer" OFF when a power-down is activated by the energy management
control unit J644.
Electric swivelling tow attachment
The electric swivelling tow attachment consists of an electro-mechanical swivel unit, which swivels the tow
attachment ball head together with the trailer socket U10. The tow attachment ball head is first swivelled
down together with the socket, and then swivelled back into its end position.
The electric swivelling tow attachment is actuated by means of a rocker in the luggage compartment on the
right.
The trailer detector control unit J345 is responsible for activation, status indication and diagnostics.
The electric swivelling tow attachment is installed as a unit behind the bumper cover.
Installation location
The trailer detector control unit J345 is installed in
the cargo space on the right under the load floor.
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