Defender. Manual — part 239

Vehicles not fitted with a battery backed sounder are fitted with an anti-theft alarm horn. The anti-theft alarm horn is

located in the RH front fender, behind the headlamp. Power supply to the anti-theft alarm horn is controlled by the anti-

theft system module via a relay located beneath the drivers seat.

If the anti-theft system is triggered, the anti-theft alarm horn will emit either a pulsed or continuous tone depending on

market legislation.

INTRUSION DETECTION MODULE

The intrusion detection module monitors movement within the vehicle cabin. The module is located;

at the top of the RH B pillar on 90/110 station wagons

on the front of the headlining, adjacent the interior mirror on 90/110 pick-ups

on the RH side of the headlining, above the front door on 130 crew cabs.

The intrusion detection module emits a series of ultrasonic sound waves. By measuring the returned sound wave the

intrusion detection module can first determine a 'foot print' of the vehicle cabin, and then determine if movement has

taken place within this area.

The intrusion detection module is connected directly to the anti-theft system module. If movement is detected in the

cabin, the intrusion detection module provides a pulsed voltage signal to the anti-theft module, triggering the alarm.

INSTRUMENT CLUSTER

Item

Part Number

Description

1

-

Anti-theft indicator

The instrument cluster contains the anti-theft indicator. The indicator provides a visual anti-theft system status. When

the anti-theft system is armed, the indicator will flash quickly (8 Hz) for a 10 second period. During this period, the anti-

theft system module will arm the system. After the 10 second period, the indicator will flash slowly (1 Hz), acting as a

deterrent to thieves. Illumination of the anti-theft indicator is controlled by the anti-theft system module.

CONTROL DIAGRAM - BATTERY BACKED SOUNDER

• NOTE: A = Hardwired

Item

Part Number

Description

1

-

Battery

2

-

Hazard flasher switch

3

-

Driver's door switch

4

-

Hood switch

5

-

Front passenger door switch

6

-

RH rear door switch (if fitted)

7

-

LH rear door switch (if fitted)

8

-

Tail door switch

9

-

Diagnostic socket

10

-

Instrument cluster

11

-

Intrusion detection module

12

-

Battery backed sounder

13

-

central junction box (CJB)

14

-

Anti-theft system module

15

-

Ignition switch

16

-

BJB

CONTROL DIAGRAM - ANTI-THEFT ALARM HORN

• NOTE: A = Hardwired