Anti-Theft - Active
Anti-Theft - Active
COMPONENT LOCATION
OVERVIEW
The active anti-theft system is available with three different levels of vehicle protection depending on market specification:
- Hinged panel sensing
- Hinged panel and intrusion sensing
- Hinged panel, intrusion and inclination sensing.
The system is controlled by software in the CJB (central junction box) which indicates an alarm trigger condition:
- Visually, using the direction indicators.
- Audibly, using the vehicle horn and, depending on market specification, either a passive or active sounder.
The passive sounder is an anti-theft disc horn and the active sounder is a BBUS (battery backed-up sounder).
The BBUS is an intelligent unit which communicates to the CJB (central junction box) over a LIN (local interconnect network) connection. The BBUS is fitted with an inclination sensor.
Monitoring of the hinged panels is carried out using switches located in each door latch assembly, the hood latch assembly, and the tailgate latch assembly. The condition of the switches is monitored by the CJB (central junction box).
Monitoring of front door lock status is carried out using switches located in the door latch mechanisms. The condition of the switches is monitored by the front door modules and transmitted to the CJB (central junction box) over the medium-speed CAN (controller area network).
Monitoring of the cabin interior is carried out using an interior motion sensor, which comprises an ultrasonic sound wave sensor to determine if there is movement within the cabin. Information from the interior motion sensor is communicated to the CJB (central junction box) over a LIN (local interconnect network) connection.
When armed, the active anti-theft system can be triggered in one of the following ways:
- A door ajar switch indicates a door is open.
- The hood or upper tailgate ajar switches indicate that either is open.
- Either front door latch mechanism indicates a door has been unlocked.
- The emergency key blade is used to open the LH (left-hand) front door.
- The CJB (central junction box) is disconnected (this may result in only a partial trigger).
- An attempt is made to start the engine without a valid signal from the Smart Key.
- The BBUS is disconnected (partial trigger only).
- The vehicle battery is disconnected on a vehicle fitted with a BBUS (partial trigger only).
- The inclination sensor detects a change in vehicle attitude.
- The interior motion sensor detects movement within the cabin.
- Panic alarm from the Smart Key.
CAUTION: The interior motion sensor electrical connections, particularly those to the sensors mounted in the roof console, are very delicate and must be handled with care.
CAUTION: The interior motion sensor is an electro-statically sensitive part and should only be handled in an electro-statically controlled environment.
Alarm Indicator
The alarm indicator is a LED (light emitting diode) located in the instrument cluster, operation of the alarm indicator is controlled by a hardwired input the CJB (central junction box). When the ignition is off the indicator gives a visual indication of the active anti-theft system to show if the alarm system is active or not active.
The alarm LED (light emitting diode) will begin to flash once every 2 seconds to indicate that the vehicle alarm is armed.
Door Modules
The door modules provide the interface between the door latch-motors, the door latch-switches and the CJB (central junction box). The door modules provide door switch status information and enable the door latch-motors on request from the CJB (central junction box) or the keyless vehicle module.
Keyless Vehicle Module
The Keyless Vehicle Module interfaces with the Central locking, RF (radio frequency) receiver and collects RF signal information which is transmitted from the Smart Key. This information is translated into commands which are passed on the medium-speed CAN (controller area network) to the:
- CJB (central junction box),
- front door modules, and
- instrument cluster.
The keyless vehicle module also monitors:
- four interior antennas,
- two load-space antennas,
- four door handle antennas and one rear bumper antenna, if passive entry is fitted.
On vehicles with passive entry, the additional fast latch motors are controlled via the keyless vehicle module and the locking status is passed to the CJB (central junction box) on the medium speed CAN (controller area network).
Passive Anti-Theft Horn
The passive anti-theft horn is hardwired to the CJB (central junction box) and activates when the alarm is triggered.
Battery Backed-Up Sounder (BBUS)
The BBUS uses an integral sounder to produce an audio warning when the alarm is triggered. An inclination sensor is incorporated into the BBUS, to monitor vehicle attitude, see Inclination Sensor.
Operation of the BBUS is controlled by the CJB (central junction box) via exchange signals on the LIN (local interconnect network). Under normal operation the BBUS is powered by a permanent battery power supply from the CJB (central junction box). However, if the power feed is disrupted an integral rechargeable battery powers the BBUS.
On receipt of the arming signals, the BBUS sounder and the inclination sensor respond with a status signal. If there is no response to the arming signals within 12 seconds, the CJB (central junction box) assumes there is a fault and sends a disarm signal to the sounder or the inclination sensor, as appropriate. The CJB (central junction box) also stores a related fault code.
If the alarm is subsequently triggered, with the BBUS sounder disarmed, the CJB (central junction box) uses the passive anti-theft horn or vehicle horn to sound the audio warning.
Inclination Sensor
The inclination sensor measures the longitudinal and lateral angle of the vehicle over a range of ±16° from the horizontal. When the anti-theft alarm system is armed in the intrusion detection mode, the BBUS stores the current angles in memory and monitors the inclination sensor readings. If the vehicle attitude changes in either direction by more than the alarm limit, the BBUS activates the sounder.
Interior Motion Sensor
When the vehicle is double locked, the interior motion sensor monitors for movement in the vehicle's cabin.
The interior motion sensor consists of a micro-controller, two acoustic transmitters and one acoustic receiver. The receiver and one of the transmitters face forward and the other transmitter faces rearward to ensure complete coverage of the vehicle's cabin.
The interior motion sensor is powered by a feed from the CJB (central junction box) and activates and de-activates the interior motion sensor. When the interior motion sensor is active it outputs ultrasonic pulses from the transmitters and checks the echoes picked up by the receiver for changes to the passenger compartment profile. If it detects a change of profile, indicating movement in the passenger compartment, the interior motion sensor reports the alarm to the CJB (central junction box).
Each time the interior motion sensor is armed, it performs a self test. If there are no faults the interior motion sensor sends an acknowledgment signal to the CJB (central junction box). If the CJB (central junction box) does not receive the acknowledgment signal it de-activates the interior motion sensor.
CONTROL DIAGRAM
NOTE:
A = Hardwired;
N = Medium Speed CAN Bus; O = LIN Bus
PRINCIPLES OF OPERATION
The active anti-theft system arms and disarms in conjunction with the locking and unlocking of the central locking system. For additional information, refer to Handles, Locks, Latches and Entry Systems
Depending on the configuration of the CJB (central junction box), the active anti-theft system can be armed and disarmed when the locking system is activated with the Smart Key. Visual and audible confirmation of the arming and disarming is provided by the direction indicators and the BBUS.
On vehicles not fitted with the interior motion sensor and BBUS, the anti-theft alarm system is armed in the perimeter mode when the vehicle is either single or double locked.
On vehicles with the interior motion sensor the anti-theft alarm system is armed in one of two modes:
- Single Locking: only the hinged panels are monitored.
- Double Locking: the hinged panels the vehicle interior, and if the BBUS is incorporated the vehicle attitude, are monitored.
When the vehicle is double-locked, the CJB (central junction box) sends an arming signal to the BBUS and interior motion sensor. If the CJB (central junction box) does not receive an acknowledgment signal from the BBUS and the interior motion sensor, the CJB (central junction box) disables the associated alarm feature for the remainder of the armed cycle.
Locking and Arming the Vehicle
NOTE:
The vehicle will only lock, if all door, tailgate and hood apertures are closed. If a lock attempt is made when an aperture is open, the vehicle will not lock and two audible error warnings will sound.
Single locking:
- Pressing the lock button briefly on either the door handle or Smart Key, will initiate the CJB (central junction box) to arm the anti-theft alarm system in the perimeter mode and send an arming signal to the sounder in the BBUS. This secures the vehicle and prevents the doors being opened from outside of the vehicle; however they can still be unlocked and opened from inside the vehicle. The hazard warning lamps will flash once as confirmation and 'if enabled' an audible warning will also sound. The alarm indicator in the instrument cluster will flash continuously.
Double locking:
- Pressing the lock button twice within three seconds on either the door handle or Smart Key, will initiate the CJB (central junction box) to arm the anti-theft alarm system in the perimeter mode and interior motion detection mode. The CJB (central junction box) will also send an arming signal to the BBUS. Double locking secures the vehicle and prevents the doors being unlocked or opened from inside or outside of the vehicle, except with a recognized Smart Key. The perimeter alarm and interior motion protection are turned on. The hazard warning lamps will flash twice, with a long second flash as confirmation and if enabled an audible warning will also sound.
- The vehicle set-up menu in the message center allows the intrusion detection and inclination protection to be temporarily disabled the next time the vehicle is locked using the Smart Key. This feature prevents accidental triggering of the active anti-theft system during transportation of the vehicle or if a pet is left in the vehicle. The sensor override functionality will be active for one lock/unlock cycle only and will default back to sensor active mode automatically.
Emergency Disarming
If the alarm has been triggered and cannot be disarmed with the Smart Key, it can be disarmed using the emergency Smart Key blade. This is achieved by unlocking the left-hand front door with the key blade and deactivating the alarm by:
- pressing the unlock button on the Smart Key, or by
- pressing the engine START/STOP button with the Smart Key inside the vehicle.