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HDC Hill Descent Control
The concept
HDC is a system for driving downhill in
steep terrain. This system reduces
vehicle speed on steep downhill gradi-
ents, thus allowing you to maintain con-
trol of your BMW under these condi-
tions.
The vehicle moves at slightly more than
walking speed without active interven-
tion from the driver.
HDC is available for activation at vehi-
cle speeds below approx. 20 mph/
35 km/h. When driving down steep hills
with a speed below approx. 20 mph/
35 km/h, the vehicle reduces speed
automatically down to slightly more
than walking speed, approx. 5 mph/
8 km/h, and then maintains this speed.
You can use the accelerator or brakes
to vary this automatically controlled
speed within a range extending from
approx. 3 mph/5 km/h to 15 mph/
25 km/h.
You can specify a target speed within
the same range by using the +/– but-
tons of the cruise control.
HDC is automatically deactivated once
vehicle speed again exceeds approx.
35 mph/60 km/h.
Activating the system
Press the button, the indicator lamp
lights up.
The indicator lamp flashes when the
brakes are applied automatically.
Deactivating the system
Press the button again; the indicator
lamp goes out.
HDC is deactivated automatically above
a road speed of approx. 35 mph/
60 km/h and when the ignition is
switched off.
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Using HDC
With manual transmission:
Use HDC in first gear and in Reverse
since the engine's braking effect is
diminished in the higher gears.
With automatic transmission:
You can use HDC in every drive posi-
tion.
In case of a malfunction
The indicator lamp in the button goes
out in the HDC mode or does not come
on when HDC is switched on:
HDC is temporarily not available if
brake temperature is too high.
If the indicator lamp also lights
up:
A fault as occurred in the HDC
system.
Have your BMW Sports Activity Vehicle
center inspect this system as soon as
possible.
Online Edition for Part No. 01 41 0 157 897 - © 08/03 BMW AG