Self-Study Program

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Control units
Mode of operation
The swivel-out operation is executed by the hinged tow attachment ball head motor V317 and monitored by
the trailer detector control unit J345. If the tow attachment comes collides with an obstacle while swivelling
out, the swivel-out operation is stopped. To detect collisions, the control unit monitors the power
consumption of the hinged tow attachment ball head motor V317. The swivel-out operation can be continued
by pressing the button continuously.
Legend
E474 Electric hinged tow attachment coupling button
G473 Trailer coupling motor Hall sender
J345 Trailer detection control unit
K211 Extending tow ball coupling warning lamp
K212 Retracting tow ball coupling warning lamp
L76 Button illumination (via 58s)
V317 Hinged tow attachment ball head motor
364_052
G473 V317 E474
J345
31
30
58s
G471 Earth G471 Positive G471 Signal V317 Earth V317 Positive
K212 LED retracting K211 LED extending Switch information - retracting Switch information - extending 31