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8
S A F E T Y
TRAJECTORY CONTROL SYSTEMS
Anti-skid regulation (ASR) and
electronic stability programme
(ESP)
T h e a n t i - s k i d r e g u l a t i o n o p t i m i s e s
t r a c t i o n t o p r e v e n t s k i d d i n g o f t h e
wheels, by acting on the brakes of the
driving wheels and on the engine.
T h e e l e c t r o n i c s t a b i l i t y p r o g r a m m e
acts on the brake of one or more
w h e e l s a n d o n t h e e n g i n e t o k e e p
the vehicle on the trajectory required
by the driver. Activation
These systems are activated auto-
matically each time the vehicle is
started.
T h e y c o m e i n t o o p e r a t i o n i n t h e e v e n t
o f a g r i p o r t r a j e c t o r y p r o b l e m . T h i s i s i n d i c a t e d b y fl a s h i n g
of this warning light on the
i n s t r u m e n t p a n e l . Disarming
I n e x c e p t i o n a l c o n d i t i o n s ( s t a r t i n g a
vehicle which is bogged down, stuck
in snow, on soft ground...), it may
be advisable to disarm the ASR and
ESP systems, so that the wheels
c a n m o v e f r e e l y a n d r e g a i n g r i p .
Press the "ESP OFF" button, lo-
cated in the centre of the fascia.
If this warning light comes
o n o n t h e i n s t r u m e n t p a n e l
and the indicator light on the
button comes on, this indi-
cates that the ASR and ESP
systems are disarmed.
Snow driving assistance
(SNOW MOTION)
Y o u r v e h i c l e h a s a s y s t e m t o h e l p
driving on snow:
SNOW MOTION.
This automatic system continuously
c h e c k s f o r s i t u a t i o n s o f d i f fi c u l t s u r -
face adhesion that could make it dif-
fi c u l t t o m o v e o f f o r m a k e p r o g r e s s
o n d e e p f r e s h s n o w o r c o m p a c t e d
snow.
In these situations, the SNOW
MOTION system takes over from
the ASR s y s t e m b y o p t i m i s i n g t h e
a m o u n t o f w h e e l s l i p t o p r o v i d e t h e
best traction and trajectory control,
even without snow tyres and with or
without chains. For vehicles with Hydractive III+
s u s p e n s i o n , m a n u a l a d j u s t m e n t o f
ground clearance to the intermediate
p o s i t i o n i m p r o v e s f u r t h e r t h e a b i l i t y
t o m a k e p r o g r e s s i n d e e p s n o w ( s e e
t h e r e l e v a n t p a r a g r a p h ) .
I n e x t r e m e l y s e v e r e c o n d i t i o n s ( s n o w
o n t o p o f i c e , s a n d , d e e p m u d … ) , i t
can be useful to deactivate the
ESP/
ASR systems to allow a degree of
w h e e l s p i n a n d s o r e c o v e r g r i p .
