Location of components
| Item name | Spare part number | Description |
| 1 | - | Anti-theft alarm |
| 2 | - | Intrusion sensor |
| 3 | - | Self-powered alarm siren (BBUS) |
General provisions
The security system monitors the condition of all hinged body panels for unauthorized opening. On some models, the anti-theft system monitors the internal volume of the passenger compartment for penetration and changes in the position of the car body.
The anti-theft system is controlled by the CJB (central switching unit). When the CJB alarm is triggered (central switching unit) Includes car horns or self-powered siren and hazard warning lights.
The anti-theft system consists of:
- Anti-theft indicator.
- Siren B.B.U.S (depending on the supply market).
- Intrusion sensor (depending on the supply market).
- Block CJB (central switching unit).
- Limit switches under the hood, in doorways and in the opening of the tailgate. For more information refer to Handles, Locks, Latches and Entry Systems (50114 Handles, Locks, Latches and Entry Systems)
- Automobile sound signals. For more information contact Horn (413-06 Horn)
Anti-theft indicator
The security system signaling device is an LED (Light-emitting diode) red glow, installed in the instrument panel and designed for visual indication of the status of the anti-theft system. The signaling device is controlled by the CJB (central switching unit), which changes the blinking frequency of the LED depending on the status of the anti-theft system.
Indication of the status of the anti-theft system
| State | Description | Anti-theft indicator |
| 0 - Disabled | When the system is disabled. And also during the first 10 seconds after activating the system, if one of the guarded body panels is open. | Off. |
| 1 - Activated | Passes 10 seconds after the anti-theft alarm is activated. | 10ms flash every 2s. |
| 2 - Turning on the security around the perimeter (switch to standby mode) | All body panels are closed. The start of the system status indication is delayed by 2.5 seconds to allow time for the double lock command to be processed. | Double flash of 10 ms every 2 s for 10 s. |
| 3 - Activation of the ultrasonic penetration sensor | All body panels are closed and the intrusion sensor is activated. The start of the system status indication is delayed by 2.5 seconds to allow time for the double lock command to be processed. | Triple flash of 10 ms every 2 s for 10 s. |
Siren B.B.U.S (if available)
Siren BBUS is located in the engine compartment, next to the brake booster. The BBUS siren uses a built-in sound generator that emits a loud alarm after the anti-theft alarm is triggered. The BBUS unit is supplied with or without a body tilt sensor, depending on the country of sale. Externally, both BBUS sirens look the same.
The operation of the BBUS block is controlled by the CJB (central switching unit). Block CJB (central switching unit) and the BBUS block communicate via the LIN communication bus (local bus). The BBUS siren is normally powered by a continuous battery power supply from the CJB (central switching unit). In case of disconnection of the battery, the siren is powered by a rechargeable battery built into the signal.
When the active anti-theft system is in the perimeter protection mode or in the interior protection mode, the CJB unit (central switching unit) sends an activation signal to the BBUS siren. When the active anti-theft system is in interior volume protection mode, the CJB (central switching unit) sends a signal to activate the body tilt sensor (if available). When activated, the siren and tilt sensor respond with their status signal. If there is no response to activation signals within 12 seconds, the CJB (central switching unit) detects this as a malfunction and sends a deactivation signal to the siren or body tilt sensor, depending on which device is installed. Block cJb (central switching unit) also logs related trouble codes.
If the anti-theft system is on standby with the siren deactivated, then when the CJB goes into the alarm state (central switching unit) will use a car horn instead of a siren.
If the siren is activated, the CJB (central switching unit) sends periodic signals (clock pulse) to the BBUS unit, and the BBUS unit controls the battery power circuit and the communication line with the CJB unit (central switching unit). Siren BBUS turns on if:
- It receives an enable signal from the CJB block (central switching unit) or body tilt sensor.
- The communication line with the CJB block is broken (central switching unit) or power circuits.
Intrusion sensor (if available)
| Item name | Spare part number | Description |
| 1 | - | Front pair "transmitter-receiver" |
| 2 | - | back pair "transmitter-receiver" |
An intrusion sensor is installed in the roof housing in front of the second row interior lamp housing and monitors intrusion into the passenger compartment when the anti-theft system is activated.
The intrusion sensor consists of a microcontroller, two acoustic transmitters and two acoustic receivers. A pair "transmitter/receiver" oriented to the front of the car, and the second - to the rear. Front pair "transmitter/receiver" is housed in a rubber housing attached to the microcontroller housing. The rear pair is also encased in a rubber case, remote from the microcontroller, but connected to it with a four-wire cable.
Intrusion sensor powered by CJB (central switching unit). Block CJB (central switching unit) activates and deactivates the intrusion sensor simultaneously with the activation and deactivation of the interior volume protection mode. When the intrusion sensor is turned on, its transmitters constantly generate ultrasonic pulses, and then use the receivers to receive pulses reflected from objects in the cabin in order to track changes in the profile of the passenger compartment. When profile changes are detected that indicate movement in the passenger compartment, the intrusion sensor sends an alarm to the CJB (central switching unit).
Each time the ultrasonic sensor is turned on, it performs a self-diagnostic procedure. If no faults are found, the sensor sends to the CJB (central switching unit) confirmation signal. In case the CJB block (central switching unit) did not receive a confirmation signal from the sensor, it turns it off.
System operation
Block CJB (central switching unit) automatically activates and deactivates the anti-theft system when operating the central locking system (CLS). For more information refer to Handles, Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems)
System activation
If the car is not equipped with an intrusion and tilt sensor, the anti-theft system switches to the perimeter protection mode when locking or double locking the locks.
If the car is equipped with an intrusion sensor, the anti-theft system can be activated in one of two modes:
- The perimeter security mode, when the system monitors only the opening body panels, is activated when the car is locked with a remote control.
- Volume protection mode, when the system monitors the opening body panels, the internal volume and, if there is a tilt sensor, the position of the body. The volume protection mode is activated when the locks are set to the double locking position using the remote control.
- The driver's door is closed.
- A valid key is not in the ignition.
- The anti-theft system is not in the warning state.
- The anti-theft system is activated.
- Block CJB (central switching unit) not in transport mode.
Wrong actions when locking
If the driver's door is open when a lock or double lock signal is received, the anti-theft system remains deactivated and the CJB (central switching unit) generates a signal about the impossibility of locking for a short (100ms) turning on car horns.
After receiving from the CJB block (central switching unit) activation commands, the anti-theft system enters the perimeter protection mode, starting monitoring the status of all hinged body panels, and then, depending on the configuration, sends an activation signal to the BBUS unit. On vehicles equipped with an intrusion sensor, the CJB (central switching unit) enters interior protection mode by sending activation signals to the intrusion sensor and body tilt sensor. After giving a command to activate the intrusion sensor, the CJB unit (central switching unit) ignores sensor signals for 30 seconds so that the sensor accurately determines the internal volume.
If any hinged body panel other than the tailgate is open, the CJB (central switching unit) activates the stay mode, but ignores the opening of the body panel as an alarm condition and generates a signal about the impossibility of locking. When the locks of a vehicle equipped with an intrusion sensor are in the double locking state and if any door or tailgate is left open, the CJB (central switching unit) does not switch the system to the internal volume protection mode, but remains in the perimeter protection mode. If the previously opened door closes and remains closed for at least 1 s, then the CJB (central switching unit) recognizes this door as having received the right to trigger the alarm and, if there is a corresponding configuration, goes into the protection mode of the internal volume.
Deactivation
Block CJB (central switching unit) deactivates the anti-theft system when an unlock request is received from the remote control.
When the vehicle is unlocked through the left front door lock, the CJB (central switching unit) deactivates the anti-theft system after a valid ignition key is inserted into the ignition switch or after receiving an unlock request from the remote control. Block CJB (central switching unit) determines the validity of the key using a relay coil located around the ignition switch.
Block CJB (central switching unit) can selectively deactivate anti-theft system components to prevent unnecessary alarms, for example, in the following cases:
- On vehicles equipped with a parking heating and cooling system, the CJB (central switching unit) deactivates the intrusion sensor, if present, during operation of the parking heating and cooling system. This prevents the alarm from being triggered by the movement of air blown by the fan. Block CJB (central switching unit) reactivates the intrusion sensor after the parking heating or cooling system is turned off. Block CJB (central switching unit) deactivates and reactivates the sensor in response to an A/C alarm level request (air conditioning systems), which is the ATC controller (automatic temperature control) transmits on medium speed CAN bus (local area network of controllers).
- If the anti-theft system is activated and in volume protection mode, and if the battery voltage drops below 9V, the CJB (central switching unit) disables the intrusion sensor and body tilt sensor and puts the system in the perimeter arming mode. This prevents a false alarm from being generated by a sensor that cannot operate properly at that voltage.
- If the battery voltage drops from 9.5 V to 9 V in less than 30 minutes on a vehicle equipped with a BBUS siren, the CJB (central switching unit) disables the BBUS siren and uses vehicle horns as needed. This prevents false alarms caused by the CJB block (central switching unit) does not send clock signals to the BBUS unit at a voltage below 9 V, which the latter determines as a tampering attempt. If the voltage rises above 9.5 V, the CJB (central switching unit) reactivates the BBUS.
- If the vehicle is unlocked with the remote control and no hinged body panels are opened or a valid key is inserted in the ignition within 1 minute after unlocking, the CJB (central switching unit) automatically locks the car and activates the anti-theft system. This prevents the vehicle from being left unlocked and with the anti-theft system disabled by accidentally pressing the unlock button on the remote control.
Alarm
When an alarm is triggered, the CJB (central switching unit) gives light and sound signals. Audible alarms are given by vehicle horns or the BBUS siren. Light alarms are given with the help of alarm lamps.
If the BBUS siren is used for sounding alarms, the siren works with a cycle of 30 seconds on and 5 seconds off. If, after a 5-second break, the reason for triggering the alarm remains, the cycle repeats. The BBUS siren performs a maximum of 10 cycles each time an alarm is triggered or until a deactivation signal is received.
If the vehicle horn is used to sound alarms, the CJB (central switching unit) controls signals with the following cycle: on for 30 seconds and 5 seconds off. If, after a 5-second break, the reason for triggering the alarm remains, the cycle repeats. Block CJB (central switching unit) controls the audible signals for a maximum of 10 cycles each time an alarm is triggered or until a deactivation signal is received. Limiting the operation of the signals to ten cycles prevents them from being damaged by overload.
When turned on, the BBUS siren or vehicle horns are pulsed for 380 milliseconds on and off. The hazard warning lamps flash for 380 milliseconds on and off in time with the audible alarm.
The anti-theft system switches from the activated state to the alarm mode if:
- The hood or any door opens, including the tailgate.
- Received a motion signal from the intrusion sensor.
- Received a signal from the body tilt sensor.
- An invalid key has been found in the ignition switch. For reliable recognition of the key inserted into the ignition lock, the repeater in the lock is given 0.4 seconds.
- The left front door is opened with the key, and after opening it, the CJB unit (central switching unit) does not recognize a valid key in the ignition lock and does not receive an unlock request signal from the remote control.
- If the personal button on the remote control is configured to trigger an alarm, when it is pressed, the CJB will (central switching unit) turns on the alarm, as discussed above. The alarm is activated regardless of whether the anti-theft system is on or off. Block CJB (central switching unit) cancels the alarm if it receives a lock or unlock signal from the remote control or it recognizes a valid key in the ignition. In vehicles destined for the US and Canadian markets, after 160 seconds of triggering the alarm, the anti-theft system returns to the state it was in before the alarm was triggered.
Alarms are immediately turned off and the anti-theft system returns to the activated state when a lock signal is received from the remote control. Block CJB (central switching unit) ignores source (And) the current alarm and the next alarm can only be triggered by the remaining switches or sensors. Ignored alarm triggers return to the state where their signals will be accepted if they are in a state that does not cause an alarm for at least 1 second. For example, the anti-theft system is in the interior volume protection mode when the door is opened and this triggers an alarm. Pressing the lock button on the remote control resets the anti-theft system to standby and causes the CJB to (central switching unit) ignore the signal from the open door limit switch and from the intrusion sensor. One second after the door is closed, the CJB unit (central switching unit) will again consider the signal from this limit switch as valid. After another 30 seconds, which are needed to restore the cabin configuration to the memory, the CJB unit (central switching unit) begins to consider the signals of the intrusion sensor as valid.
The CJB block in the alarm trigger log file (central switching unit) stores the last ten switches or sensors that triggered an alarm. They can be read using the T4 diagnostic tool by connecting to the medium speed CAN bus (local area network of controllers). The alarm log file can only be cleared when the anti-theft system is deactivated. Each entry in the accounting file contains a number corresponding to the switch or sensor that triggered the alarm.
Alarm Trigger Sources
| Source No | Description |
| 0 | No recorded sources |
| 1 | Driver door open limit switch |
| 2 | Front passenger door open limit switch |
| 3 | Rear right door open limit switch LH (right) |
| 4 | RH rear door open limit switch (right) |
| 5 | Tailgate open limit switch |
| 6 | Limit switch for loose hood closing |
| 7 | ignition switch |
| 8 | Unlocking the door with the key from the outside |
| 9 | Body Tilt Sensor |
| 10 | Intrusion sensor |
If an alarm is triggered during system standby and the system is immediately deactivated, the CJB (central switching unit) Provides 200 millisecond on and off hazard warning lights for 3 seconds.
Vehicle transportation mode
If the vehicle is in transport mode, the anti-theft system is disabled.
Diagnostics
Block CJB (central switching unit) monitors communication lines with BBUS siren, body tilt sensor and intrusion sensor. If any of the communication lines fails, in the memory of the CJB block (central switching unit) the appropriate DTC will be logged and can be read using the T4 scan tool.
Fault codes
| Malfunction | Description |
| Communication line failure with BBUS unit | If within 12 seconds the LIN line does not receive a BBUS status response to a request from the CJB (central switching unit), a BBUS communication line fault code is logged. Block CJB (central switching unit) continues trying to communicate with the BBUS even if the link to the BBUS is down. |
| BBUS internal fault | If the CJB block (central switching unit) sends a command (Power On/Off/Alarm/Standby) to the BBUS unit, and the status signal from the BBUS unit is not received within 12 seconds, a fault code is stored «BBUS internal fault». |
| BBUS enable signal source | The BBUS unit remembers the source of the signal that caused the last activation of the siren. Values that can be written: 0 = No trip 1 = Power interruption trip 2 = LIN break trip 3 = CJB external command trip (central switching unit) |
| Tilt sensor internal fault | If the CJB block (central switching unit) sends a command (Power On/Off/Alarm/Standby) body tilt sensor in the BBUS unit and the BBUS status signal is not received for 12 seconds, a DTC is set «Body Tilt Sensor Internal Malfunction». |
| Malfunction of the communication line with the intrusion sensor | If a 100 ms impulse response does not enter the intrusion sensor turn-on line within 350 ms after the activation command from the CJB (central switching unit), an intrusion sensor fault code is logged. |
Control System Diagram
NOTE: A = wired connection; F = RF channel; N = Medium speed CAN bus (local area network of controllers); O = LIN bus
| Item name | Spare part number | Description |
| 1 | - | Accumulator battery |
| 2 | - | Ignition |
| 3 | - | RF receiver |
| 4 | - | Left front door open limit switch |
| 5 | - | Limit switch open right front door |
| 6 | - | Limit switch for loose hood closing |
| 7 | - | Left rear door open limit switch |
| 8 | - | Limit switch open right rear door |
| 9 | - | Tailgate open limit switch |
| 10 | - | CJB () |
| 11 | - | Diagnostic connector |
| 12 | - | Anti-theft alarm |
| 13 | - | Left car horn |
| 14 | - | Right car horn |
| 15 | - | Right turn signal repeater |
| 16 | - | Right rear turn signal |
| 17 | - | Right front turn signal |
| 18 | - | Left front turn signal |
| 19 | - | Left rear turn signal |
| 20 | - | Left turn signal repeater |
| 21 | - | Intrusion sensor |
| 22 | - | BBUS |
| 23 | - | Repeater coil |
| 24 | - | ignition switch |
| 25 | - | Fuse link 11E in BJB block (battery switching unit) |
| 26 | - | Fuse link 17E in BJB block (battery mounting box) |
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