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08 Starting and driving
08
288
* Option/accessory, for more information, see Introduction.
WARNING
HDC does not work in all situations but is
designed merely as a supplementary aid.
The driver always bears ultimate responsi-
bility for ensuring that the vehicle is driven
safely.
Function
HDC On/Off.
HDC is activated or deactivated with one of
the centre console's switches. The lamp
within it illuminates when the function is acti-
vated.
When HDC is working normally the
combined instrument panel's symbol
illuminates combined with the text message
Hill descent control ON.
The function only operates in first gear posi-
tion and in reverse gear. For an automatic
gearbox, gear position 1 must be selected,
which is shown with the figure
1 in the com-
bined instrument panel, see Automatic gear-
box - Geartronic* (p. 269).
NOTE
HDC cannot be activated on an automatic
gearbox in position D.
Operation
HDC allows the car to roll at a maximum of
10 km/h forwards with engine braking and
7 km/h backwards. However, any speed
within the gear's speed register can be
selected using the accelerator pedal. When
the accelerator pedal is released, the car is
braked quickly to 10 or 7 km/h respectively,
irrespective of the hill's gradient and without
the need for the footbrake.
The brake lights come on automatically when
the function is operating. The driver can brake
or stop the car at any time by using the foot-
brake.
HDC is deactivated:
•
with the centre console's On/Off button
•
if a gear higher than 1 is selected on a
manual gearbox
•
if a gear higher than 1 is selected on an
automatic gearbox, or if the gear selector
is moved to position D.
The function can be disengaged at any time.
If it takes place on a steep downhill gradient
then the braking effect will not release
directly, but slowly instead.
NOTE
With HDC activated you may experience a
delay between acceleration pedal activa-
tion and engine response.
Related information
•
All Wheel Drive (AWD)* (p. 287)
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