4892-01
2) Components
4. HDC (HILL DESCENT CONTROL)
1) System Overview
The HDC system is an automatic descent control device that allows the vehicle to automatically
decelerate to about 7 km/h by 0.1G, on steep roads (slope level exceeding 10%) through a
separately installed switch operation.
When the vehicle speed reaches below 7 km/h (refer to the information below), the HDC
automatically terminates the operation.
HDC Switch
When this switch is pressed
once, HDC is ready for use.
The green HDC indicator on
the instrument cluster comes
on. When the button is
pressed again, HDC is
deactivated and the indicator
goes off. When the HDC is
operating on a steep
downhill, When the HDC is
operating on a steep
downhill, the HDC indicator in
meter cluster blinks with
heavy operating sound.
Sensor Cluster
The G sensor in sensor
cluster detects the gradient of
the roads. When the HDC is
ready by HDC switch, G
sensor sends the HDC
request signal to ESP HECU if
the vehicle is driving on a
downhill with over 10%
gradient.
HDC Indicator
Green light on: HDC is ready
for use (by pressing the HDC
switch).
Green light blinking: HDC is
being applied.
Red light on: the HDC system
is overheated or
malfunctioning.
The G sensor in sensor cluster measures the actual gradient of roads. However, it may
recognize a sharp turn or rough road as a steep downhill with over 10% of gradient. Thus, it
may cause an operation of HDC system.