Citroen C4: Electronic stability control (ESC)

The electronic stability control programme includes the following systems:

- Anti-lock braking system (ABS) and Electronic brake force distribution (EBFD).

- Emergency braking assistance (EBA).

- Post Collision Safety Brake (PCSB).

- Anti-slip regulation (ASR).

- Dynamic stability control (DSC).

- Trailer stability assist (TSA).

• Anti-lock braking system (ABS)/Electronic brake force distribution (EBFD)
• Anti-slip regulation (ASR)/ Dynamic stability control (DSC)

Anti-lock braking system (ABS)/Electronic brake force distribution (EBFD)

These systems enhance the vehicle's stability and handling during braking, and enable greater control while cornering, particularly on poor or slippery road surfaces.

ABS prevents wheel locking in the event of emergency braking.

Electronic brake force distribution (EBFD) manages overall braking pressure on each individual wheel.

► When braking in an emergency, depress the pedal very firmly and maintain this pressure.

Normal operation of the ABS may make itself felt by slight vibrations of the brake pedal.

The fixed illumination of this warning lamp signals that there is a fault with the ABS.

The vehicle retains conventional braking. Drive carefully at a moderate speed.

Have it checked by a CITROËN dealer or a qualified workshop.

This warning lamp, when lit together with the STOP and ABS warning lamps, accompanied by a message and an audible signal, indicates an EBFD malfunction.

You must stop the vehicle.

Stop as soon as it is safe to do so and switch off the ignition.

Contact a CITROËN dealer or a qualified workshop.

When changing wheels (tyres and rims), ensure that these are approved for your vehicle.

After an impact

Have it checked by a CITROËN dealer or a qualified workshop.

Post Collision Safety Brake (PCSB)

If an accident is detected, the vehicle automatically initiates a post collision safety braking. The goal of this system is to reduce the risk of further collisions if the driver does not react.

The system acts on frontal, lateral and rear collision.

The system is not operational if the capability of the vehicle to trigger and execute the post collision safety braking is not available, as it can occur in destructive accidents or in other specific accident scenarios.

It is possible to override the automatic braking by pressing the accelerator pedal.

Operating conditions

The system operates, if the following conditions are met:

• Airbags or pyrotechnic seat belt pretensioners have been deployed by the collision.
• Braking systems and electric functions remain continuously operational during and after collision.
• Driver has not depressed the accelerator pedal.

Malfunction

In the event of a malfunction, one of these warning lamps will come on fixed on the instrument panel, accompanied by the Service warning lamp, the display of a message and an audible signal.

Have it checked by a CITROËN dealer or a qualified workshop.

Emergency braking assistance (EBA)

This system reduces the emergency stopping distance, by optimising the braking pressure.

It is triggered in relation to the speed at which the brake pedal is depressed. The effect of this is a reduction in the resistance of the pedal and an increase in braking efficiency.

Anti-slip regulation (ASR)/ Dynamic stability control (DSC)

Anti-slip regulation (or traction control) optimises traction by using engine braking and by applying the brakes on the driving wheels to avoid one or more wheels spinning. It also enhances the vehicle's directional stability.

If there is a difference between the vehicle's trajectory and the path desired by the driver, the dynamic stability control system automatically uses engine braking and the brakes on one or more wheels to return the vehicle to the desired path, within the limits of the laws of physics.

These systems are activated automatically every time the vehicle is started.

These systems are activated in the event of a problem with grip or trajectory (confirmed by this warning lamp flashing on the instrument panel).

Deactivation/Reactivation

In exceptional conditions (e.g. moving a vehicle that is bogged down in mud, stuck in snow, on loose soil), it may prove useful to deactivate the ASR system, so that the wheels can move freely and regain grip.

Reactivate the system as soon as the level of grip permits.

With Touch screen BLUETOOTH audio system or MyCitroën Play

The ASR system is deactivated/ reactivated in the Driving touch screen menu.

With MyCitroën Drive Plus

The ASR system is deactivated/ reactivated in the ADAS touch screen application.

Deactivation of the ASR system is indicated by this indicator lamp on the instrument panel coming on and the display of a message.

The ASR system is automatically reactivated every time the ignition is switched off or at speeds over 31 mph (50 km/h) Reactivation is manual below 31 mph (50 km/h).

Malfunction

In the event of a malfunction, this warning lamp lights up on the instrument panel, accompanied by the display of a message and an audible signal.

Have it checked by a CITROËN dealer or a qualified workshop.

ASR/DSC

These systems enhance safety during normal driving, but 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 these systems activated in all conditions, and particularly in difficult conditions.

Correct operation of these systems depends on compliance with the manufacturer's recommendations relating to the wheels (tyres and rims), braking and electronic components, as well as the assembly and repair procedures provided by CITROËN dealers.

In order to ensure that these systems remain effective in wintry conditions, the use of snow or all-season tyres is recommended.

All four wheels must be fitted with tyres approved for your vehicle.

All tyre specifications are listed on the tyre/paint label. For more information on Identification markings, refer to the corresponding section.