CITROËN C4 Picasso Owner's Handbook Manual page 228

Safety
Intelligent traction control
system ("Snow motion")
Your vehicle has a system to help driving on
snow: intelligent traction control.
This system detects situations of difficult
surface adhesion that could make it difficult to
move off or make progress on deep fresh snow
or compacted snow.
In these situations, the intelligent traction
control limits the amount of wheel slip to
provide the best traction and trajectory control
for your vehicle.
In extremely severe conditions (deep snow,
mud, ...), when it proves impossible to move off,
it may be useful to temporarily deactivate the
ESP/ASR systems to allow the wheels to spin
freely and so allow movement of the vehicle.
The use of snow tyres is strongly
recommended on surfaces offering low levels
of adhesion.
228
Operation
Anti-lock braking system (ABS)
and electronic brake force
distribution (EBFD)
When this warning lamp comes on,
accompanied by an audible signal
and a message, it indicates that there
is a fault with the ABS, which could
cause loss of control of the vehicle
when braking.
When this warning lamp comes on,
coupled with the STOP warning lamp,
accompanied by an audible signal and a
message, it indicates that there is a fault
with the electronic brake force distribution
(EBFD), which could cause loss of
control of the vehicle when braking.
You must stop as soon as it is safe to do so.
In both cases, contact a CITROËN dealer or a
qualified workshop.
When changing wheels (tyres and rims),
make sure that these are approved for
your vehicle.
Normal operation of the ABS may make
itself felt by slight vibrations of the brake
pedal.
In emergency braking, press
very firmly without releasing the
pressure.