Anti-Theft - Active: Description and Operation

Anti-Theft - Active

DESCRIPTION

Introduction
The anti-theft alarm system monitors the hinged panels for unauthorised opening. On some vehicles the anti-theft alarm system also incorporates interior monitoring and vehicle tilt sensing functions.

Operation of the anti-theft alarm system is controlled by the Central Junction Box (CJB). When an alarm is triggered, the CJB sounds the vehicle horns or the Battery Backed-Up Sounder (BBUS) and illuminates the hazard flashers. The CJB also controls operation of the alarm indicator, which is installed in the instrument cluster. This provides a visual indication of anti-theft alarm system status.

OPERATION

Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 11E and fusible link 17E (C0632) on an R wire. Both are located in the Battery Junction Box (BJB). Fusible link 17E (C0570) provides a feed to the following on an NR wire:
^ Fuse 12P
^ Fuse 26P
^ The CJB.

Fuse 12P and fuse 26P are located in the CJB.

Fuse 26P (C0583) provides a constant battery feed to the Battery Backed-Up Sounder (BBUS) (C0666) on a B wire. Fuse 12P provides a constant battery feed to the horn relay, which is also located in the CJB. The earth path for the relay coil is controlled by the CJB.

Fusible link 11E (C0570) is connected to the ignition switch (C0028) by an N wire. When the ignition key is placed in the barrel, current flows across the switch (C0028) to the CJB via fuse 40P (C0582) on an LGW wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028) to the CJB (C0582) on a W wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to the CJB (C0582) on a Y wire. When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to the CJB via fuse 60P (C0582) on a WR wire.

The CJB is provided a ground path via a B wire.

Volumetric Sensor
The volumetric sensor monitors the inside of the vehicle by emitting a series of ultrasonic pulses and measuring the profile of the returned echo. The sensor (C0358) is provided a power feed by the CJB (C0586) on a G wire, and an 'arm' signal on a GB wire. If the volumetric sensor detects movement within the passenger compartment it provides a trigger signal to the CJB (C0586) on an R wire. The sensor (C0358) is provided a ground on a B wire.

Central Junction Box

Drivers Door
The Central Junction Box (CJB) (C0586) is connected to the drivers door ajar switch (C1449) by a BN wire. The drivers door switch is a normally open switch. When the door is opened, the switch contacts close and a ground path is created on a B wire.

Front Passenger Door
The CJB (C0586) is connected to the front passenger door ajar switch (C1451) by a BU wire. The front passenger door switch is a normally open switch. When the door is opened, the switch contacts close and a ground path is created on a B wire.

LH Rear Door Switch
The CJB (C0586) is connected to the LH rear door ajar switch (C0442) by a PLG wire. The LH rear door switch is a normally open switch. When the door is opened, the switch contacts close and a ground path is created on a B wire.

RH Rear Door Switch
The CJB (C0586) is connected to the RH rear door ajar switch (C0442) by a PLG wire. The RH rear door switch is a normally open switch. When the door is opened, the switch contacts close and a ground path is created on a B wire.

NOTE: The LH and RH rear door ajar switches have the same connector number as they utilise the same harness.

Hood
The CJB (C0584) is connected to the hood ajar switch (C0007) by a PO wire. The hood ajar switch is a normally open switch. When the hood is opened, the switch contacts close and a ground path is created on a B wire.

Tailgate
The CJB (C0586) is connected to the upper tailgate ajar switch (C0616) by a BR wire. The upper tailgate ajar switch is a normally open switch. When the upper tailgate is opened, the switch contacts close and a ground path is created on a B wire.

Anti-Theft Alarm Indicator
The anti-theft alarm indicator is located in the instrument cluster and acts as a visual deterrent to any would be thieves. Illumination of the indicator (C0230) is controlled by the CJB (C0580) on a BS wire. By switching the ground path for the indicator on and off, the CJB can control its flashing sequence.

Battery Backed-Up Sounder
The Battery Backed-Up Sounder (BBUS) (C0666) is attached to the plenum in the engine compartment, next to the brake booster. It is provided a constant battery feed via fuse 26P in the CJB (C0583) on a B wire. A ground path is provided via a B wire.

Operation of the BBUS is controlled by the CJB. The CJB (C0584) communicates with the BBUS (C0666) via the Local Interconnect Network (LIN) bus communications network on a B wire.

Horns
The horn relay (C0583) receives a constant battery feed from fuse 12P, which is also located in the CJB. When the CJB determines the horns should be activated, it provides a ground path for the relay coil. The energised horn relay (C0583) is now able to provide a feed to the LH (C0003) and RH (C0004) horns on a pair of PG wires. Both are provided a ground path on B wires.

Hazard Flashers
When the anti-theft alarm is triggered, the CJB operates the hazard flashers by providing feeds as follows:
^ To the LH front headlamp assembly (C0009) on a GR wire.
^ To the LH tail lamp assembly (C0121) on a GR wire.
^ To the LH side repeater (C0013 on LHD vehicles, C0012 on RHD vehicles) on a GR wire (GR then GW on RHD vehicles).
^ To the RH front headlamp assembly (C0011) on a GW wire.
^ To the RH tail lamp assembly (C0125) on a GW wire.
^ To the RH side repeater (C0012 on LHD vehicles, C0013 on RHD vehicles) on a GW wire (GW then GR on RHD vehicles.

All are provided a ground path via B wires.

The CJB (C0585) also provides feeds to the trailer socket on a Y wire and a G wire. The trailer socket is provided a ground path on a W wire.