2010.5 Citroen DS4 DAG tyre pressure

When the engine is running or the vehicle is being driven, the illumination of one of the following warning lamps indicates a fault which requires action on the par t of the driver. The warning comes on in the instrument panel or appears in the central colour screen associated with the satellite navigation system.
If your vehicle has a screen, a warning lamp coming on is always accompanied by the display of an additional message, to assist you in identifying the problem. If you encounter any problems, do not hesitate to co ntact a CITROËN dealer or a qualified workshop.
Warning lampis onCauseAction/Obser vations
STOP fixed, alone or associated with another warning lamp, accompanied by an audible signal and a message in the screen.
Illumination of this warning lamp is associated with a serious braking system, power steering, engine lubrication or cooling system fault or a punctured tyre.
Stop as soon as it is safe to do so as there is a risk that the engine will cut out while driving. Park, switch off the ignition and contact a CITROËN dealer or a qualified workshop.
Maximum coolant temperature fixed red. The temperature of the cooling system is too high. Stop as soon as it is safe to do so. Wait until the engine has cooled down before toppin g up the level, if necessary. If the problem persists, contact a CITROËN dealer or
qualified workshop.
Engine oil pressure fixed. There is a fault with the engine lubrication system. You must stop as soon it is safe to do so. Park, switch off the ignition and contact a CITROËN dealer or a qualified workshop.

43Monitoring
Ser vice
temporarily, accompanied by a message.
A minor fault has occurred for which there is no specific warning lamp. Identify the fault by reading the message shown on the screen, such as, for example: - the opening of the doors, boot or bonnet, - the engine oil level, - the remote control battery,
- the tyre pressures, - saturation of the par ticle emission filter on Diesel vehicles (see "Checks - § Checks/Par ticle emissions filter"). For any other faults, contact a CITROËN dealer or a qualified workshop.
fixed, accompanied by a message and an audible signal.
A major fault has occurred for which there is no specific warning lamp. Identify the fault by reading the message shown on the screen and contact a CITROËN dealer or a qualified workshop.
Warning lampis onCauseAction/Obser vations
Par ticle emissions filter (Diesel)
fixed, accompanied by an audible signal
message on the risk of blockage of the par ticle emissions filter.
This indicates that the par ticle emissions filter is star ting to become
saturated.
As soon as driving conditions allow, regenerate the filter by driving at a speed of at least 35 mph (60 km/h)
until the warning lamp goes off.
fixed, accompanied by an audible signal and and a message that the
particle emissions filter additive level is too low.
This indicates the low level of the additive reser voir. Have the reser voir topped up as soon as possible by a CITROËN dealer or a qualified workshop.

Monitoring
Power steering fixed. The power steering has a fault. Drive carefully at reduced speed. Have it checked by a CITROËN dealer or a qualified workshop.
Under-inflated tyre fixed. The pressure in one or more wheels is too low. Check the pressure of the tyres as soon as possible. This check should preferably be carried out when the tyres are cold.
Directional headlamps flashing. The directional headlamps system has a fault. Have it checked by a CITROËN dealer or a qualified workshop.
Warning lampis onCauseAction/Obser vations
Foot on the brake pedal
fixed. The brake pedal is not pressed. With the 6 -speed electronic gearbox system, press the brake pedal to star t the engine (lever in position N ). If you wish to release the parking brake without pressing the brake pedal, this warning lamp will remain on.
flashing. With the 6 -speed electronic gearbox system, if you hold the vehicle on an incline using the accelerator for too long, the clutch overheats.
Use the brake pedal and/or the electric parking brak e.
Airbags
temporarily. This lamp comes on for a few seconds when you turn on the ignition, then goes off.
This lamp should go off when the engine is star ted. If it does not go off, contact a CITROËN dealer or a qualified workshop.
fixed. One of the airbag or seat belt pretensioner systems has a fault. Have it checked by a CITROËN dealer or a qualified workshop.

Tyre under-infl ation detection
System which automatically and continuously checks the pressure of the tyres while driving. Sensors fitted in each valve trigger a warning in the event of problem (speed above 12 mph (20 km/h)).
Puncture
The tyre under-inflation detection system is an aid to driving which does not replace the need for the driver to be vigilant or to drive responsibly.
Under-infl ated tyre
This warning lamp is displayed on the instrument panel and/or a message appears in the screen, accompanied
by an audible signal, to identify the wheel concerned.
The STOP warning lamp comes on and/or this warning lamp is displayed on the instrument panel, accompanied by
an audible signal and a message in the screen identifying the wheel concerned.
 Stop as soon as it is safe to do so, avoiding any sudden movement of the steering wheel and the brakes.  Repair or change the damaged wheel (punctured or very deflated tyre), and have the tyre pressure checked as soon as possible.
 Check the tyre pressures as soon as possible. This check must be carried out when the tyres are cold.

173Safety
Sensor(s) not detected or faulty
A message appears in the screen, accompanied by an audible signal, to identify the wheel or wheels which are not detected or
to indicate a fault in the system. Contact a CITROËN dealer or a qualified workshop to replace the faulty sensor(s).
All repairs and changing of tyres on a wheel fitted with this system must be carried out by a CITROËN dealer or a qualified workshop.
If, when changing a tyre, you install a wheel which is not detected by your vehicle (example: fitting of snow tyres), you must have the system reinitialised by a CITROËN dealer or a qualified workshop.
This system does not avoid the need to have the tyre pressures checked regularly (refer to the "Identification markings" section) to ensure that
the optimum dynamic per formance of the vehicle is maintained and prevent premature wear of the tyres, par ticularly in arduous driving conditions (heavy load, high speed). The tyre pressures must be checked cold, at least once a month. Remember to check the pressure of the spare wheel. The tyre under-inflation detection system may experience temporary inter ference due to electro-magnetic emissions on a frequency close to that used by the system.
This message is also displayed when one of the wheels is away from the vehicle (being repaired) or when one or more wheels without a sensor are fitted. If your vehicle is equipped with a spare
wheel, this is not fitted with a sensor.

Braking assistance systems
Group of supplementary systems which help you to obtain optimum braking in complete safety in emergency situations: - anti-lock braking system (ABS), - electronic brake force distribution (EBFD), - emergency braking assistance (EBA).
Anti-lock braking system
and electronic brake force
distribution
Linked systems which improve the stability and manoeuvrability of your vehicle when braking, in par ticular on poor or slippery sur faces.
Activation
The anti-lock braking system comes into operation automatically when there is a risk of wheel lock. Normal operation of the ABS may make itself felt by slight vibration of the brake pedal.
When braking in an emergency, press very firmly without releasing the pressure.
Operating fault
If this warning lamp comes on, together with the STOP and ABSwarning lamps, accompanied by an audible signal and a message in the multifunction screen, it indicates a malfunction of the electronic brake force distribution which could result in loss of control of the vehicle when braking. You must stop as soon as it is safe to do so.
When replacing wheels (tyres and rims), ensure that they conform to the manufacturer's recommendations.
If this warning lamp comes on, accompanied by an audible signal and a message in the multifunction screen, it indicates a malfunction of the anti-lock braking system which could result in loss of control of the vehicle when braking.
In either case, contact a CITROËN dealer or a qualified workshop.

175Safety
Emergency braking assistance
System which, in an emergency, enables you to obtain the optimum braking pressure more quickly, thus reducing the stopping distance.
Activation
It is triggered by the speed at which the brake pedal is pressed. The effect of this is a reduction in the resistance of the pedal and an increase in braking efficiency.
When braking in an emergency, press firmly without releasing the pressure.
Trajectory control systems
Anti-skid regulation (ASR)
and electronic stability
programme (ESP)
The anti-skid regulation (also known as Traction Control) optimises traction to prevent skidding of the wheels, by acting on the brakes of the driving wheels and on the engine. The electronic stability programme acts on the brake of one or more wheels and on the engine to keep the vehicle on the trajectory required by the driver, within the limits of the laws of physics.
Activation
These systems are activated automatically each time the vehicle is star ted. They come into operation in the event of a grip or trajectory problem.
This is indicated by flashing of this warning lamp in the instrument panel.
Snow driving assistance
(Intelligent Traction Control)
Your vehicle has a system to help driving on snow: Intelligent Traction Control. This automatic system continuously checks for situations of difficult sur face adhesion that could make it difficult to move off or make progress on deep fresh snow or compacted snow. In these situations, Intelligent Traction Control takes over from the ASR system, limiting the amount of wheel slip to provide the best traction and trajectory control, even
without snow tyres and with or without chains. In extremely severe conditions (snow on top of ice, sand, deep mud…), it can be useful to
deactivate the ESP/ASR systems to allow a degree of wheel spin and so recover grip.

175Safety
Emergency braking assistance
System which, in an emergency, enables you to obtain the optimum braking pressure more quickly, thus reducing the stopping distance.
Activation
It is triggered by the speed at which the brake pedal is pressed. The effect of this is a reduction in the resistance of the pedal and an increase in braking efficiency.
When braking in an emergency, press firmly without releasing the pressure.
Trajectory control systems
Anti-skid regulation (ASR)
and electronic stability
programme (ESP)
The anti-skid regulation (also known as Traction Control) optimises traction to prevent skidding of the wheels, by acting on the brakes of the driving wheels and on the engine. The electronic stability programme acts on the brake of one or more wheels and on the engine to keep the vehicle on the trajectory required by the driver, within the limits of the laws of physics.
Activation
These systems are activated automatically each time the vehicle is star ted. They come into operation in the event of a grip or trajectory problem.
This is indicated by flashing of this warning lamp in the instrument panel.
Snow driving assistance
(Intelligent Traction Control)
Your vehicle has a system to help driving on snow: Intelligent Traction Control. This automatic system continuously checks for situations of difficult sur face adhesion that could make it difficult to move off or make progress on deep fresh snow or compacted snow. In these situations, Intelligent Traction Control takes over from the ASR system, limiting the amount of wheel slip to provide the best traction and trajectory control, even
without snow tyres and with or without chains. In extremely severe conditions (snow on top of ice, sand, deep mud…), it can be useful to
deactivate the ESP/ASR systems to allow a degree of wheel spin and so recover grip.