2014 Citroen DS5 HYBRID4 four wheel drive

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Tyre under-infl ation detection
System which automatically checks the pressures of the tyres while driving. The system continuously monitors the pressures of the four tyres, as soon as the vehicle is moving. A pressure sensor is located in the valve of a each tyres (except the spare wheel). The system triggers an alert if a drop in pressure is detected in one or more tyres.
This system does not avoid the need to check the tyre pressures regularly (including the spare wheel) and before a long journey. Driving with under-inflated tyres
adversely affects road holding, extends braking distances and causes premature tyre wear, particularly under arduous conditions (vehicle loaded, high speed, long journey).
The tyre pressures for your vehicle can be found on the tyre pressure label (see the "Identification markings" section). The tyre pressures must be checked when the tyres cold (vehicle stopped
for 1 hour or after driving for less then 6 miles (10 km) at moderate speed). Other wise, add 0.3 bar to the values indicated on the label.
Driving with under-inflated tyres increases fuel consumption.
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.

145Driving
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The alert is maintained until the tyre or tyres concerned is reinflated, repaired or replaced. The spare wheel (space-saver type or a steel rim) does not have a sensor.
The loss of pressure detected does not
always lead to visible deformation of the tyre. Do not rely on just a visual check.
This alert is also displayed when one or more wheels is not fitted with a sensor (for example, a space-saver or steel spare wheel).
The alert is given by the fixed illumination of this warning lamp, accompanied by an audible signal, and depending on equipment, the display of a message.
The flashing and then fixed illumination of the under-inflation warning lamp accompanied by the illumination of the "service" warning lamp indicates a fault with the system.
Under-inflation alert Operating fault
In the event of a problem on one of the tyres, the symbol or the message appears, according to equipment, to identify it.  Reduce speed, avoid sudden steering movements or harsh brake applications.  Stop as soon as it is safe to do so.
Go to a CITROËN dealer or a qualified workshop to have the system checked or, following the repair of a puncture, to have the original wheel, equipped with a sensor, refitted.
In this case, monitoring of the tyre pressures is not assured.
 If you have a compressor (the one in the temporary puncture repair kit for example), check the four tyre pressures when cold. If it is not possible to check the tyre pressures at the time, drive carefully at reduced speed. or  In the event of a puncture, use the temporary puncture repair kit or the spare wheel (according to equipment).

201Safety
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DSC/ASR
The DSC and ASR systems offer increased safety in normal driving, but they should not encourage the driver to take extra risks or drive at high speed. It is in conditions of reduced grip (rain, snow, ice) that the risk of loss of grip increases. It is therefore important for your safety to keep the DSC and ASR systems activated in all conditions, and particularly in difficult conditions.
The correct operation of these systems depends on observation of the manufacturer's recommendations regarding as much the wheels (tyres and
rims), braking and electronic components as the assembly and repair procedures used by CITROËN dealers. To benefit in full from the effectiveness of the DSC and ASR systems in wintry conditions, the vehicle must be fitted with four snow tyres, allowing the the vehicle to retain neutral behaviour on the road.
After an impact, have these systems checked by a CITROËN dealer or a qualified workshop.