Citroen C4: Adaptive cruise control

For more information, refer to the General recommendations on the use of driving and manoeuvring aids and the Specific recommendations on cruise control.

This system automatically maintains the vehicle speed at a value set by the driver (speed setting), while respecting a safety distance from the vehicle in front (target vehicle) previously set by the driver. The system automatically manages the acceleration and deceleration of the vehicle.

With the Stop function, the system manages braking until the vehicle comes to a complete stop.

With the Stop & Go function, the system manages braking until the vehicle comes to a complete stop and restarts the vehicle.

The brake lamps come on if the vehicle is slowed down by the system.

It can be dangerous to drive if the brake lamps are not in perfect working order.

To do this, the system uses a camera fitted at the top of the windscreen and a radar fitted in the front bumper.

Primarily designed for driving on main roads and motorways, this system only works with moving vehicles driving in the same direction as your vehicle.

If the driver activates the direction indicator to overtake a slower vehicle, cruise control may temporarily reduce the distance to the target vehicle to facilitate overtaking, without exceeding the speed setting.

• Steering-mounted controls
• Use
• Messages and alerts
• Operating limits

Steering-mounted controls

1. Selection/deselection of cruise control only or Highway Driver Assist (depending on version)
2. Switch on/pause cruise control at the previously saved speed setting
   Confirmation of vehicle restart after automatic stop (version with Stop & Go function)
3. Increase/Decrease the speed setting (if cruise control activated)
   Activation of cruise control in progress (if cruise control deactivated)
   Display and configuration of the inter-vehicle distance setting
4. Activation of cruise control in progress
   Use the speed suggested by the Road signs recognition function

For more information on the Road signs recognition function, refer to the corresponding section.

Information displayed on the instrument panel

5. Cruise control activated (green)/paused (grey)
6. Speed setting value
7. Speed suggested by the Road signs recognition function
8. Vehicle held stationary (version with Stop&Go function)
9. Inter-vehicle distance setting
10. Position of the vehicle detected by the system

Use

Selecting the system

► With the engine running, press 1-ASSIST to select cruise control mode.

The symbol for the Adaptive cruise control system is displayed on the instrument panel.

Switching on cruise control

With an EAT8 automatic gearbox or a drive selector, your speed must be between 0 and 112 mph (0 and 180 km/h).

System activation is also subject to the following conditions:

- Driver's door closed.

- Driver's seat belt fastened.

- Mode D selected on the automatic gearbox.

- Parking brake released.

- If the vehicle is stationary, brake pedal depressed.

A message OK? is displayed if all activation conditions are met.

► Press 3 or 4-OK: the current speed becomes the speed setting (minimum 19 mph (30 km/h) ) and cruise control is immediately activated (green display).

Modifying the speed setting

To change the speed setting using the vehicle's current speed:

► For steps of +/- 1 mph (1 km/h), make successive short presses upwards/downwards on 3 to increase/decrease.

► For steps of +/- 5 mph (5 km/h), press and hold upwards/downwards on 3 to increase/ decrease.

Prolonged pressing and holding upwards/downwards on 3 causes a rapid change in vehicle speed.

When the function is activated, the speed setting value can be changed using the speed suggested by the Road signs recognition function displayed on the instrument panel:

- When passing the sign:

► Press 4-OK to save the suggested speed.

This value is then immediately shown as the new speed setting on the instrument panel.

- After passing the sign:

► Press 4-OK. The message "OK?" is displayed to confirm the request to save.

► Press 4-OK again to save the suggested speed. The new speed setting value is displayed on the instrument panel.

Pausing/Resumption of cruise control

► Press 2-II> or depress the brake pedal. The symbol turns grey.

Cruise control may also have been paused:

- automatically, if the electronic stability control (ESC) system is triggered.

- by shifting to neutral or engaging reverse gear.

- by using the electric parking brake.

- by unfastening the seat belt.

- by opening the driver's door.

► Press 2-II> or 4-OK to reactivate cruise control.

With an EAT8 gearbox or a drive selector, following braking that has brought the vehicle to a complete stop, if the traffic conditions do not allow the vehicle to begin moving again within 3 seconds of stopping, press 2-II> or the accelerator pedal to move off.

Cruise control remains active following a gear change.

When cruise control is paused and the driver tries to reactivate it, the message "Activation not possible, conditions not met" is temporarily displayed if reactivation is impossible (required conditions not met).

Changing the programmed speed setting with the Road signs recognition function

► Press 4-OK to accept the speed suggested by the function on the instrument panel, then press again to confirm.

If the selected speed is far from the current vehicle speed, a strong acceleration or deceleration is felt.

Changing the inter-vehicle distance

► Press 3 to display the distance setting thresholds ("Distant", "Normal" or "Close"), then make successive short presses upwards/ downwards to select a threshold.

After a few seconds, the option is accepted and will be memorised when the ignition is switched off.

The driver must keep a sufficient safety distance from the vehicle in front.

Temporarily exceeding the speed setting

► Depress the accelerator pedal. The system is suspended as long as the acceleration is maintained. The speed next to the symbol disappears from the instrument panel.

Deselecting the system

► Press 1-ASSIST until the symbols disappear from the instrument panel.

Messages and alerts

The actual order of display of the messages or alerts may be different.

(grey symbol)

Cruise control selected, but cannot be activated.

All the operating conditions have not been met.

(grey symbol)

Cruise control selected, awaiting activation.

All the operating conditions are met.

(grey symbol)

Cruise control paused, but cannot be reactivated.

All the operating conditions have not been met.

(green symbol)

Cruise control active, vehicle detected.

(green symbol)

Cruise control suspended, following brief acceleration by the driver.

(orange)

"Take back control"

► Brake or accelerate, depending on the context.

(red)

"Take back control"

► Take back control of the vehicle immediately: the system cannot manage the current driving situation.

"Activation refused, conditions unsuitable"

The system refuses to activate cruise control, as the necessary conditions are not fulfilled.

Stop & Go function

(green symbols)

The system has brought the vehicle to a complete stop.

Within 3 seconds of stopping, the vehicle gradually and automatically begins moving again.

Beyond 3 seconds of stopping, the driver must accelerate or press 2-II> to move off.

If the driver takes no action after the vehicle has been stopped, the electric parking brake is applied automatically after about 5 minutes.

While the vehicle is immobilised, the following recommendations apply:

- The driver should not leave the vehicle.

- Do not open the boot.

- Do not drop off or pick up passengers.

- Do not engage reverse gear.

When restarting the vehicle, beware of cyclists, pedestrians or animals who are not taken into account by the system.

The driver must monitor their surroundings.

Operating limits

Cruise control operates by day and night, in dry weather or moderate rainfall.

Certain situations cannot be managed by the system and require driver intervention.

Cases not taken into account by the system:

- Pedestrians, cyclists, animals.

- Stationary vehicles (e.g. traffic jams, breakdown).

- Vehicles crossing your lane.

- Vehicles driving in the opposite direction.

Situations where the driver must suspend the system:

- Vehicles in a tight bend.

- When approaching a roundabout.

- When following a narrow vehicle.

Reactivate the system when conditions allow.

Situations in which the driver is prompted to immediately resume control:

- Excessively sharp deceleration by the vehicle in front of you.

- When a vehicle cuts in sharply between your vehicle and the one in front.

Some vehicles on the road may be poorly perceived or interpreted by the camera and/or the radar (e.g. truck), which can lead to an incorrect evaluation of distances and result in inappropriate acceleration or braking of the vehicle.

Pay particular attention:

- When motorcycles are present and when there are vehicles staggered across the traffic lane.

- When entering a tunnel or crossing a bridge.

If any of the following malfunctions occurs, do not use the system:

- Following an impact on the windscreen close to the camera or on the front bumper (versions with radar).

- Brake lamps not working.

If the vehicle has undergone any of the following modifications, do not use the system:

- Carrying long objects on roof bars.

- Towing.

- Use of the "space-saver" type spare wheel (depending on version).

- Front end of the vehicle modified (for example by adding long-range headlamps or painting the front bumper).

- Obstructed radar and/or camera.

Malfunction

In the event of a malfunction, dashes are displayed instead of the speed setting.

This warning lamp comes on, accompanied by a message and an audible signal, to confirm the malfunction.

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