Audi A6´05 323 Service page 19

On pulling the handwheel in the boot, the contact
switch on handwheel F354 is closed. On turning the
handwheel, the locking bolt on the trailer coupling
is unlocked mechanically by a Bowden cable and
the contact switch on locking bolt F355 opens.
After being unlocked, the trailer coupling can be
swivelled out/in mechanically. After being swivelled,
it is automatically locked by spring power. The
contact switches return to their initial position.
The control unit cannot differentiate between a
locked, swivelled-in trailer coupling and a locked,
swivelled-out trailer coupling.
The locking state is indicated by two LEDs in the
handwheel for the trailer coupling. When the green
warning lamp for trailer coupling locked (K226)
lights up continuously, it indicates that the trailer
coupling is swivelled in/out correctly.
323_036
The red warning lamp for trailer coupling
unlocked (K227) flashes when the trailer coupling is
not locked. In addition, a message appears on the
central display in dash panel insert J285.
When terminal 15 is switched off, the warning lamp
for trailer coupling locked (K226) switches off if the
tailgate/boot lid is closed or remains open for
CHECK
longer than 10 minutes. The warning lamp for trailer
TRAILER
coupling unlocked (K227) switches off if the tailgate/
boot lid is closed or remains open for longer than COUPLING
20 minutes. The respective warning lamp switches
on again when there is a control unit wake-up or a
CAN wake-up.
323_033
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