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Land Rover Defender 1999 2002my Workshop Supplement Body Repair 2nd Edition Rover Manual

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    							86ELECTRICAL
    2
    DESCRIPTION AND OPERATION SECURITY AND CENTRAL DOOR LOCKING
    SYSTEM COMPONENTS - FROM 02MY
    1.Engine immobilisation warning lamp
    2.Security LED
    3.Transponder coil
    4.CDL actuators (tail door shown)
    5.Immobilisation ECU (300Tdi models only)
    6.Remote handset and key7.Door switches
    8.Bonnet switch
    9.Alarm sounder
    10.Battery Backed Up Sounder (BBUS)
    11.Anti-theft alarm ECU
    12.Volumetric sensor 
    						
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    DESCRIPTION AND OPERATION ANTI-THEFT ALARM - FROM 02MY
    The alarm and immobilisation system on 2002MY Defender is similar to that used on Discovery Series I (LJ)
    models from 1996MY. The alarm system comprises the anti-theft alarm ECU, bonnet and door switches and a
    volumetric sensor.
    Anti-Theft Alarm ECU
    The anti-theft alarm ECU is located behind the instrument pack and receives a permanent battery supply via fuses
    6 and 7 in the under seat fuse box. The ECU also receives a battery supply via the ignition switch position II and
    fuse 1 in the passenger compartment fuse box. The ECU is connected to the various supporting components by
    two harness connectors.
    The ECU controls the alarm system (perimetric and volumetric security), CDL system, engine immobilisation
    system (Td5 only) and various other vehicle functions including direction indicators and interior lamps.
    The anti-theft alarm ECU incorporates an RF receiver and antenna for reception of RF signals from the remote
    handset for locking and alarm arming. The antenna is unterminated at one end, and for optimum performance the
    antenna must not be wound around adjoining harnesses.
    The anti-theft alarm ECU operates at one of two frequencies which are identified by a label on the unit. The
    frequencies are:
    433 MHz - Europe, Gulf States, South Africa
    315 MHz - North America, South East Asia, Japan, Australia.
    The anti-theft alarm ECU also incorporates an integral inertia switch. In the event of an impact of sufficient severity
    to trigger the inertia switch when the ignition is on, the ECU will unlock all doors and operate the hazard warning
    lamps. The ECU will remain in this condition for a pre-programmed period of 2 minutes. To reinstate CDL
    functionality and to deactivate the hazard warning lamps, the ignition should be turned off and then on after the 2
    minute timer has expired.
    NOTE: There is a separate inertia switch for fuel cut off. 
    						
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    DESCRIPTION AND OPERATION Door and Bonnet Switches
    The bonnet switch is located at the rear of the bonnet aperture on the bulkhead. The door switches are located on
    the’A’posts for the front doors, the’B’posts for the rear doors and on the inside face of the tail door aperture.
    The drivers door switch and the bonnet switch are connected to the anti-theft alarm ECU on individual single
    wires. The remaining passenger doors and, if applicable, the tail door are jointly connected on a single wire to the
    ECU. If a fault occurs which involves incorrect mislock signals, alarm triggers and interior lamp operation, the door
    switch earth may be the cause of incorrect operation.
    If any door or the bonnet is opened, the switch closes and completes an earth path to the anti-theft alarm ECU.
    This completed earth path input is sensed by the ECU, which, if armed, will sound the BBUS or alarm sounder.
    The ECU also controls, via the door switches and ignition on/off signals, the operation of the interior lamps. 
    						
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    DESCRIPTION AND OPERATION Perimetric Protection
    Perimetric protection is the monitoring of each opening door or bonnet to unauthorised intrusion. The anti-theft
    alarm ECU uses the door and bonnet switches described previously to determine when illegal intrusion has
    occurred.
    If a door/bonnet is left open when the alarm system is armed, the ECU will determine a mislock situation which is
    indicated by non operation of the hazard warning lamps. If the drivers door is left open, the security LED in the
    instrument pack will be illuminated for the 10 second confirmation period. If any other door or the bonnet is left
    open the security LED will remain off for the 10 second confirmation period. After the confirmation period, the LED
    will revert to the 1Hz deterrent flash.
    If the door/bonnetis subsequently closed, the hazard warning lamps will flash to show that full perimetric protection
    is now invoked. The security LED will also resume the 10 second confirmation flash.
    If only the bonnet is left open, all doors will have perimetric protection and volumetric protection will also be set. If
    a door is left open, the volumetric protection is suspended until that door is subsequently closed.
    Volumetric Protection
    The vehicle alarm system can be armed with or without volumetric protection activated. If volumetric protection is
    required, the vehicle must be locked using the lock button on the remote handset. If volumetric protection is not
    required, because a pet is to be left in the vehicle for instance, the vehicle must be locked using the vehicle key in
    the drivers door lock.
    When the vehicle is locked using the remote handset, the volumetric sensor will wait for a period of 15 seconds
    before arming. This allows time for the air in the vehicle to settle and prevent incorrect activation of the alarm.
    If volumetric protection is set and there is a disturbance in the vehicle, i.e., a window left open or a moving object
    in the vehicle, within the 15 second period, the volumetric sensor will not activate. The sensor must detect no
    disturbance for the full 15 second period before arming. 
    						
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    DESCRIPTION AND OPERATION Volumetric Sensor
    The volumetric sensor is located behind the RH’B’post on 90/110 station wagon models, on the headlining
    between the interior lamp and rear view mirror on 90/110 pick-up models and on the headlining above the RH
    door on 130 crewcab models.
    The volumetric sensor operates by emitting a signal, which is received back to the sensor as it bounces back from
    objects inside the vehicle. Once armed, the sensor will detect a disturbance to the returned waves. This is sensed
    by the anti-theft alarm ECU which activates the alarm sounder or BBUS. 
    						
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    DESCRIPTION AND OPERATION Alarm Sounders
    1.Battery Backed Up Sounder (BBUS)
    2.Alarm sounder
    Two types of alarm sounder are available, dependant on the vehicle market configuration.
    A Battery Backed-Up Sounder (BBUS) is used in some markets and located in the LH front wing, behind the
    headlamp. This is a tamper proof sounder with its own power supply which allows it to continue operating even if
    disconnected from the vehicle power supply. The BBUS is connected to a permanent battery supply via fuse 7 in
    the under seat fuse box. Two further connections are made to the anti-theft alarm ECU and a fourth connection is
    to an earth header. If the BBUS is disconnected without first being disarmed by the anti-theft alarm ECU, it will
    operate for 4.5 minutes.
    To disarm the BBUS, when the battery is to be disconnected for instance, the ignition must be turned on to
    position II and back to the off position , after which a 17 second delay is initiated to allow the battery or BBUS
    connector to be disconnected. If the BBUS sounds, it can be disarmed by unlocking the vehicle with the remote
    handset.
    Where a BBUS is not specified, a standard vehicle horn is used for the alarm sounder and is located in the LH
    front wing, behind the headlamp. The sounder is operated by an alarm relay which is controlled by the anti-theft
    alarm ECU. The relay receives a permanent battery supply via fusible link 6 in the under seat fuse box. The relay
    coil is connected to the anti-theft alarm ECU which provides an earth for the coil when horn operation is required.
    This operates the relay contacts and supplies battery voltage to the sounder, causing it to operate. 
    						
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    DESCRIPTION AND OPERATION Visual and Audible Warnings
    Audible and visual warnings are dependant on market legislation. The hazard warning lamps are controlled by two
    outputs from the anti-theft alarm ECU; one for the LH lamps and one for the RH lamps. To illuminate the warning
    lamps the output from the ECU is at battery voltage. When the lamps are off, the output is driven to earth.
    When the alarm is armed the hazard warning lamps will flash three times to indicate that the system is active.
    When the alarm is triggered the sounder will operate in either a pulsed or continuous tone (dependant on market
    legislation) and the hazard warning lamps will flash at 0.5 second on/off intervals for 30 seconds. The alarm
    system can be triggered for up to three times in any one alarm armed cycle. When the alarm system is disarmed
    confirmation will be by one single flash of the hazard warning lamps for 0.3 seconds.
    If the hazard warning lamps are active when an alarm trigger is active or the alarm is armed, the visual alarm
    active visual warning using the hazard warning lamps will be cancelled.
    In addition to the visual and audible warnings, the security LED in the instrument pack also displays alarm system
    status information. 
    						
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    DESCRIPTION AND OPERATION Security LED
    The security LED has a number of functions to indicate anti-theft alarm system status. The LED is located in the
    speedometer housing in the instrument pack. The LED receives a permanent battery supply via fusible link 6 in
    the under seat fuse box. The LED is connected to the anti-theft alarm ECU which earths the connection when LED
    operation is required. When the LED is not required to be illuminated, the anti-theft alarm ECU holds the
    connection at battery voltage, keeping the LED extinguished.
    When the system is armed and the bonnet and all doors are closed, the LED flashes quickly for a 10 second
    confirmation period and confirms that perimetric and volumetric systems are armed. After the 10 second
    confirmation period the LED flash changes to a slow flash to confirm that the alarm and immobiliser systems are
    armed and to act as deterrent to thieves.
    The LED also conveys CDL system information and this functionality is described in the Central Door Locking
    (CDL) section. 
    						
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    DESCRIPTION AND OPERATION Remote Handset
    The remote handset is a separate unit from the vehicle key and is used to arm and disarm the alarm system. The
    handset comprises two buttons; lock and unlock. The handset contains a battery (CR3032) and a printed circuit
    board containing the circuitry to generate the RF signals.
    NOTE: In selected markets, the vehicle key, when used in the drivers door key barrel switch, will
    not disarm the alarm system.
    The remote handset RF code consists of two parts. One part is a fixed code that is unique to the handset and the
    second part is a rolling code which changes in accordance with a predetermined pattern. The anti-theft alarm ECU
    can store the codes of up to four different remote handsets at any one time.
    If the remote handset battery falls below a predetermined level, the handset will transmit an additional RF signal
    code to the anti-theft alarm ECU when either button is depressed. The security LED will display this as two rapid
    flashes every 0.5 seconds to visually display the low handset battery condition. This will continue for the 10
    second confirmation period or until the ignition is switched on.
    Resynchronisation of Remote Handset
    If either the remote handset battery or the vehicle battery is removed or disconnected, the rolling part the handset
    code is lost and the handset(s) need to be resynchronised to the anti-theft alarm ECU. The resynchronisation
    procedure is as follows:
    Disconnect the vehicle battery.
    Wait for 30 seconds for residual current to dissipate.
    Reconnect the vehicle battery.
    Carefully prise the remote handset apart and remove the battery. Avoid unnecessary handling of the battery.
    With the battery removed, press either the lock or unlock button several times to remove residual current from
    the circuitry.
    Check the handset battery with a voltmeter. If the battery voltage is less than 2.7 volts, replace the battery.
    Ensure that the battery contact surfaces are clean and replace the battery in the handset clip with the + symbol
    uppermost. Put the two halves of the handset case back together.
    DO NOT press any buttons.
    With the handset within range of the vehicle, press the lock button four times in quick succession. The
    anti-theft alarm ECU will respond by locking the vehicle.
    Press the unlock button once to complete the resynchronisation procedure. 
    						
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    DESCRIPTION AND OPERATION This page is intentionally left blank 
    						
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