Anti-theft system — active (Defender 2007+)

Arrangement of elements

Pos.	Spare part number	Name
1	-	Anti-theft alarm system siren (if installed)
2	-	Front door switch right (RH)
3	-	Intrusion Detection Module (90/110 station wagon shown)
4	-	Right RH Rear Door Switch (if installed)
5	-	Instrument panel
6	-	Tailgate Switch
7	-	Left (LH) rear door switch (if installed)
8	-	Anti-theft alarm siren relay (if installed)
9	-	Front Door Left LH Switch
10	-	Anti-theft protection system module
11	-	Hood contact sensor
12	-	Siren with battery backup (if installed)

Review

The 10AS anti-theft system monitors all hinged body panels for unauthorized opening. The system also monitors attempts to enter the interior. Depending on the market, the car can be equipped with a siren with a battery backup or an anti-theft siren.



The active anti-theft protection system software is installed in the anti-theft protection system module. The anti-theft protection system module also controls the following functions:

• passive anti-theft system (engine immobilizer). For more information, see the chapter: Anti-theft system - passive (419-01B Anti-theft system - passive, Description and operating principle).
• central locking. For more information, see chapter: Handles, locks, latches and entry systems (501-14 Handles, Locks, Latches and Entry Systems, Description and Operation).
• interior lighting. For more information, see the chapter: Interior Lighting (417-02 Interior Lighting, Description and Operating Principle).
• emergency warning lights. For more information, see the chapter: Outdoor Lighting (417-01 Outdoor Lighting, Description and Operating Principle).

To activate the active anti-theft system, press the lock button on the remote control or insert the key into the driver's door lock. When using the remote control, the perimeter and volume security systems are activated simultaneously. When using the key, only the perimeter security system is activated.

Anti-theft protection system module

The anti-theft module is located behind the instrument panel and receives constant power from the battery via the battery junction box (BJB). The control unit consists of a radio frequency (RF) receiver and an antenna for receiving signals from the remote control.



Depending on the sales market, the module will operate on one of two frequencies. The operating frequency is indicated on the label on the module body. The table below shows the frequencies for each sales market.

Frequency	Markets
433 MHz	Europe, Gulf States, South Africa
315 MHz	North America, Southeast Asia, Japan, Australia

In addition, the theft deterrent module contains a built-in inertia switch. In the event of a collision severe enough to trigger the inertia switch, with the ignition switch in position II, the theft deterrent module will unlock all doors and turn on the hazard warning lights. The theft deterrent module will operate in this mode for 2 minutes. To turn off the hazard warning lights and restore normal operation of the theft deterrent module after 2 minutes, turn the ignition switch to position 0 and then back to position II.

Remote control

The remote control is used to turn the anti-theft system on and off. The remote control has locking and unlocking buttons. The remote control housing contains a printed circuit board for transmitting radio signals and a power source.

The radio code of the remote control consists of 2 parts. The first part is a fixed code, unique to this remote control. The second part is a floating code, changing according to a given algorithm. The code is received by the anti-theft system module, which is capable of storing data from 4 different remote controls.



If the remote control battery charge drops below a certain level, the remote control transmits an additional radio code to the anti-theft system module. The signal is sent to the instrument cluster indicator, which flashes twice every 0.5 seconds, informing the driver that the battery in the remote control needs to be replaced.

Siren with battery backup

Depending on the market, the vehicle may be equipped with a siren with a battery backup. The siren with a battery backup is installed behind the headlight of the (left) front wing. The siren with a battery backup is protected against tampering and, as the name suggests, is equipped with its own power source. This allows it to operate even if the vehicle's battery is disconnected. For increased protection, all siren wires are black.

If the siren is disconnected without first being deactivated, it will turn on and sound for 4 minutes 30 seconds (if it is not turned off earlier). The security system signal during this period will consist of 30-second continuous sound signals with 5-second intervals.

To deactivate a battery-backed siren for subsequent disconnection, follow these steps:

• turn the ignition switch to position II, then back to position 0,
• disconnect the vehicle battery within 17 seconds after turning off the ignition,
• Disconnect the siren from the battery backup.

if disconnecting the battery has caused the independent siren to sound, it can be reset by turning the ignition switch to position II, provided that the remote control is on the same ring as the key or in close proximity to the ignition switch.

If the activation of the autonomous siren is caused by the activation of perimeter or volume security systems, the reset methods are as follows:

• pressing a button on the remote control;
• turning the ignition switch to position II, provided that the remote control is on the same ring as the key or in close proximity to the ignition switch.

Anti-theft alarm siren

Vehicles not equipped with a battery backup siren are equipped with an anti-theft alarm siren. The anti-theft alarm siren is located behind the right RH front fender headlight. Power to the anti-theft alarm siren is controlled by the anti-theft alarm module via a relay mounted under the driver's seat.

When the anti-theft system is triggered, the anti-theft alarm siren emits a pulsating or constant sound signal (depending on the legislation of the sales market).

Intrusion Detection Module

The intrusion detection module monitors movements in the vehicle interior. The module is installed:

• on 90/110 station wagon models - in the upper part of the right RH B-pillar
• on pickups 90/110 - on the headliner next to the rearview mirror
• on 130 Crew Cab models - on the right RH side of the headliner, above the front door.

The intrusion detection module generates ultrasonic waves. By measuring the reflected signal, the intrusion detection module first determines the "image" of the car interior, and then calculates whether there is movement in this area.

The intrusion detection module is connected directly to the anti-theft module. When movement is detected in the vehicle, the intrusion detection module transmits a pulsating AC voltage signal to the anti-theft module, activating the alarm.

Instrument panel

Pos.	Spare part number	Name
1	-	Anti-theft system indicator

The instrument cluster has an anti-theft indicator. The indicator provides a visual indication of the anti-theft system status. When the anti-theft system is activated, the indicator flashes quickly (8 Hz) for 10 seconds. During this period, the anti-theft system module activates the system. After 10 seconds, the indicator flashes slowly (1 Hz) as a deterrent to thieves. The anti-theft system indicator is activated directly by the anti-theft system module.

Control circuit - siren with battery backup

NOTE: A = Wired connection

Pos.	Spare part number	Name
1	-	Battery
2	-	Hazard warning light button
3	-	Driver's door switch
4	-	Hood contact sensor
5	-	Front Passenger Door Switch
6	-	Right RH Rear Door Switch (if installed)
7	-	Rear Door Left LH Switch (if installed)
8	-	Tailgate Switch
9	-	Diagnostic connector
10	-	Instrument panel
11	-	Intrusion Detection Module
12	-	Siren with battery backup
13	-	central Junction Box (CJB)
14	-	Anti-theft protection system module
15	-	Ignition switch
16	-	BJB

Control circuit - anti-theft alarm siren

NOTE: A = Wired connection

Pos.	Spare No	Name
1	parts	Battery
2	-	Hazard warning light button
3	-	Driver's door switch
4	-	Hood contact sensor
5	-	Front Passenger Door Switch
6	-	Right RH Rear Door Switch (if installed)
7	-	Rear Door Left LH Switch (if installed)
8	-	Tailgate Switch
9	-	Diagnostic connector
10	-	Instrument panel
11	-	Intrusion Detection Module
12	-	Anti-theft alarm sound signal
13	-	Anti-theft alarm horn relay
14	-	CJB
15	-	Anti-theft protection system module
16	-	Ignition switch
17	-	BJB

Operating principles

Upon receiving the correct code from the remote control, the anti-theft module activates the perimeter and volume alarm systems. The anti-theft module also activates the passive engine immobilizer system.

For more information, please refer to the chapter: Anti-theft system - passive (419-01B Anti-theft system - passive, Description and operating principle).

Once the anti-theft system is turned on, it can be triggered up to 3 times in any of the activation modes. Perimeter security

Perimeter security is the control of all opening panels (doors of the passenger compartment/trunk compartment and hood) for unauthorized access. The anti-theft system module monitors the status of all opening panels using a wired connection system.

The driver's door switch and the hood switch are connected to the theft deterrent module via separate wires. The remaining opening panels are connected in parallel and connected to the theft deterrent module via a single cable.

All switches are open. When the panel is opened, the switch contacts close and a ground loop is created. Ground loops are created for all areas of the body except for the hood, for which the ground loop is provided by the theft deterrent module. When the theft deterrent module detects a ground loop, it determines that the panel is open and activates the alarm.

Volumetric security

Volumetric security monitors movement in the cabin. When the system is first turned on, the anti-theft module suspends volumetric security for 15 seconds. During this period, air waves in the cabin subside; this prevents false alarms. The anti-theft protection module monitors movement in the vehicle interior using the intrusion detection module. The anti-theft protection module only activates volumetric protection if the intrusion detection module detects no vibrations for 15 seconds. If movement is detected for 15, the 15-second delay period starts again from 0.

Volumetric protection can be deactivated in two ways:

• By locking the driver's door with the key instead of using the radio frequency remote control.
• By locking the car with the remote control while the driver's door is open. If the driver's door is then closed, only the perimeter security will be activated.

Visual indicators

NOTE: Visual and audible warning signals depend on the legislation in force in the particular country.

When the anti-theft protection system is switched on, its module sends a command to switch on the emergency light signaling three times. The emergency light signaling is controlled by 2 commands of the anti-theft protection system module: one switches on the left LH lights, the second - the right RH lights. The emergency light signaling is switched on by a signal from the anti-theft protection module corresponding to the battery voltage. The signal to switch off the lights corresponds to the voltage on the "ground".

The anti-theft protection system module also controls the operation of the corresponding indicator on the instrument panel. On command from the module, the indicator flashes at a frequency of 8 Hz for 10 seconds, then switches to a frequency of 1 Hz.

If the anti-theft system is triggered, its module turns on the light signal for 30 seconds at 0.5 second intervals.

Sound signals

If the anti-theft system is triggered, its module activates an audible signal. Depending on the legislation of the sales market, the audible signal is given by the siren of the anti-theft alarm, or by a siren with a backup battery power supply. According to this legislation, the siren can emit a constant or pulsating audible signal.

Depending on the vehicle specification, the theft deterrent module supplies power to the battery backup siren or the anti-theft alarm siren. To activate the siren, the theft deterrent module cuts off power and creates a ground loop.