Operating principles of the active anti-theft system (Freelander 2)

The CJB automatically switches the active anti-theft system on and off when the Central Locking System (CLS) is operated.

On vehicles without an intrusion detection module, only the perimeter mode is available, which allows monitoring of hinged body panels and the validity of the remote control.

When the perimeter mode is active, the CJB monitors the ajar switches located in the front and rear door latch mechanisms and the tailgate. A separate bonnet ajar microswitch located in the right-hand bonnet latch mechanism in the engine compartment monitors the bonnet status.

When surround mode is active, the CJB, using the intrusion detection module located in the centre of the headliner, monitors the vehicle's interior for movement.

System activation

If the vehicle is not equipped with an intrusion detection module and tilt sensor, the active anti-theft system is activated in perimeter mode when the vehicle is locked or double locking is activated.

On vehicles equipped with an intrusion detection module, the system has two operating modes; perimetric mode and volumetric mode.

Perimetric mode

Perimeter mode monitors only the hinged body panels and the validity of the remote control in the launch control module. Perimeter mode is activated by pressing the lock button on the remote control once.

Volumetric mode

The volumetric mode monitors the vehicle interior for intrusion. If the vehicle is equipped with a powered siren that has a tilt sensor, the vehicle's position is also monitored when the volumetric mode is active. The volumetric mode is activated by pressing the lock button on the remote control a second time. The second press of the button must be performed within three seconds of the first press. The second press of the lock button also activates the double-locking function of the door locks in the perimeter mode.

The CJB box activates the active anti-theft system when the vehicle is locked or double-locked, provided the following conditions are met:

• All side doors, tailgate and hood are closed
• CJB is not in transport mode

Once the vehicle has successfully completed the locking program, confirmation will be given by a single flash of the direction indicators to indicate the locked state. If double door locking is activated, confirmation will be given by pressing the direction indicators twice: one flash for locking and one long flash for double door locking.

Incorrect actions when locking

If any of the side doors, the tailgate or the bonnet is open when a locking or double locking request is received, the active anti-theft system remains disabled and the CJB will briefly sound the vehicle horns or a powered siren to indicate that locking is not possible; the direction indicators will not flash in this case. Each attempt to lock will be confirmed by emitting an audible signal.



When the CJB activates the active anti-theft system, it first enters perimeter mode and monitors the status of the hinged body panels. If the vehicle is equipped with a powered siren, the CJB sends an activation signal to enable the siren to be activated. If the vehicle is double locked and is equipped with an intrusion detection module, the CJB sends an activation signal to the module and the tilt sensor. For the first 30 seconds, the CJB ignores signals from the intrusion detection module to allow the vehicle interior time to calm down and prevent false alarms.

If the luggage compartment door is opened with the remote control, the intrusion detection module and tilt sensor are locked. The lock is valid until the luggage compartment door is closed.

Disconnection

The CJB disables the active anti-theft system to prevent false alarms under certain conditions:

• If the active anti-theft system is activated and in interior volume protection mode and the battery voltage drops below 9V, the CJB will disable the interior mode and leave the perimeter protection mode in operation. This prevents false alarms because the intrusion detection module cannot operate correctly at 9V.
• On vehicles fitted with a battery siren, if the battery voltage drops from 9.5V to 9V for more than 30 seconds, the CJB will disable the battery siren and, if necessary, will use the vehicle's horn to provide a warning. This prevents false alarms. When the voltage drops below 9V, the CJB will not generate a 'heartbeat' signal to the battery siren. The battery siren will interpret this as a CJB tamper and activate the siren. If the battery voltage subsequently rises above 9.5V, the CJB will reactivate the battery siren.
• If the vehicle is unlocked using the unlock button on the remote control and no doors/bonnet are opened within 60 seconds, the CJB automatically relocks the vehicle and re-activates the active anti-theft system (if the automatic re-locking feature is available). This prevents the vehicle being left unlocked and with the anti-theft system disarmed due to the unlock button on the remote control being pressed accidentally.

Alarm triggered

When the alarm is triggered, the CJB provides visual and audible warning signals. The audible warning signals are emitted by the vehicle's horn or a self-powered siren. The visual alarm signals are emitted by the direction indicators.

The CJB will activate the vehicle's horns or powered siren and direction indicators for 30 seconds. The alarm will pause for 5 seconds and if the alarm trigger is still present, the CJB will cycle again for 30 seconds (60 seconds in some markets). This will be repeated up to a maximum of 10 times (3 times in some markets) of 30 seconds of operation (60 seconds in some markets) during any one activation period. The CJB will disarm the alarm after 10 cycles (3 cycles in some markets) while the alarm trigger is still present or when a disarm signal is received.

NOTE: If the battery powered siren is activated due to a burglar being detected, the visual indication via the turn signals will not be activated.

The alarm can be triggered when any door/hood is opened, the intrusion detection module detects movement inside the vehicle, the tilt sensor detects vehicle movement, or unauthorized access to the ignition is detected (invalid remote control).

Self-powered siren

When the CJB activates the active anti-theft system in either perimeter mode or volume mode, the CJB sends an activation signal to the battery-powered siren via the LIN bus. When the system is activated in interior volume mode, the CJB also sends an activation signal to the tilt sensor (if equipped).

NOTE: If a battery-powered siren is installed, it will also activate with a lock request in Perimeter mode.

When the activation signals are received, the siren and tilt sensor respond by issuing a status message. If the CJB does not receive the status signals within 12 seconds, the CJB assumes that a fault has occurred and responds by issuing a disable signal to the siren and/or tilt sensor and storing the appropriate fault code. If the siren is disabled when the active anti-theft system is activated and the system is subsequently triggered, the CJB energises the horn relay and uses the vehicle's horn to sound the warning tone in place of the siren.

When the siren is activated, the CJB sends a periodic signal to the siren, which instructs the siren to monitor the vehicle battery power supply and LIN bus communication with the CJB. The siren will operate when:

• it receives an alarm signal from the CJB or tilt sensor
• power supply or LIN bus communication with CJB is interrupted

The tilt sensor measures the vehicle tilt angles in the longitudinal and transverse directions within a range of ±16 degrees relative to the horizontal plane. When the active anti-theft system is activated and in the interior volume protection mode, the tilt sensor remembers the current angular position of the body, while the sensor readings are monitored. If the angular position of the body changes in any direction by an amount exceeding the set value for triggering the alarm, the tilt sensor turns on the siren.



If the anti-theft alarm system is active and the battery or battery-powered siren is disconnected, the siren will operate without visual indication by flashing the direction indicators.

General opening/closing

The global open/close function allows the user to fully close/open the windows by pressing a button on the remote locking transmitter once. The button must be pressed and held for more than two seconds. One or both global open/close functions can be disabled using the Land Rover approved diagnostic system.

Remote control for master lock is not available in some markets, such as vehicles intended for North America.

Unlocking the driver's door only

The driver's door unlock function is characterized by the fact that only the driver's door and the trunk lid are unlocked, all other doors remain locked. A single press of the unlock button on the remote control causes only the driver's door and the trunk lid to be unlocked, a second press is required to unlock the other doors.

If the vehicle has double locking, the first press of the unlock button on the remote control unlocks the driver's door and the tailgate. The remaining doors return to the single locking state (without double locking) and can therefore be unlocked using the interior door handles, the unlock button on the remote control, or the unlock switch in the switch cluster on the instrument panel.

The change from central locking to the driver's door unlocking function can be accomplished by simultaneously pressing the lock and unlock buttons on the remote control. The direction indicators will flash to confirm this change.

Locking when driving off

The drive-away locking function locks the side doors and tailgate if they are unlocked when the vehicle reaches a certain speed.

On vehicles with automatic transmission, if all doors and the bonnet are closed and the selector lever is not in the "P" or "N" position, if the CJB detects via a high speed CAN bus message from the anti-lock brake system (ABS) module that the vehicle speed is greater than 7 km/h (4.3 mph), the doors are automatically locked.

On vehicles with a manual transmission, with the doors and bonnet closed, if the CJB detects via a high speed CAN bus message from the ABS module that the vehicle speed is greater than 7 km/h, the doors are automatically locked.

Additional functions of the remote control

The remote control has additional buttons in addition to the lock and unlock buttons.

Alarm in case of attack

The panic alarm function allows the user to activate the vehicle's anti-theft alarm system using a remote control. To activate the panic alarm, the panic alarm button, identified by the triangle symbol, must be pressed 3 times within 3 seconds or pressed and held for longer than 3 seconds.

General opening/closing

The global open/close function can be controlled by the remote control. This function allows you to open/close the car windows by pressing the lock or unlock button once. To activate the global open/close function, press and hold the button for more than two seconds. The global open/close function is not available in all countries.

Unlocking the tailgate

To unlock and release the tailgate latch only, you can press the tailgate release button. This will work when the vehicle is locked and armed or when it is unlocked. If the vehicle is locked and armed, pressing the tailgate release button will allow the tailgate to be opened without triggering the anti-theft alarm system. When the tailgate is then closed, the alarm will be reactivated.

Remote headlight switching

The remote headlight button can be pressed to activate the headlights to make it easier to approach and leave the vehicle. A single press of the button will activate the headlights for approximately 25 seconds, after which they will automatically turn off. A second press of the button will turn off the headlights if the 25-second period has not elapsed. Pressing the stop/start button during the 25-second period will also turn off the remote headlight function.

Comfort mode

When the vehicle is unlocked using the unlock button on the remote control, the vehicle's electrical system initiates comfort mode. The following systems become active:

• Memory - seat adjustment and mirror position
• Interior and exterior lighting
• Audio system
• Instrument Cluster Message Center
• Sound signal
• Cigarette lighter/power socket