Land Rover Defender 2002 Electrical Library Rover Manual

FUSE DETAILS
2.6DEFENDER 02MY
F34 20 A All RH front window switch.
F35 20 A All LH front window switch.
F36 30 A Td5 Heated front screen relay.
F36 30 A 300 Tdi Not used.
FuseRatingVe hi cl eFunction 

EARTH POINTS AND HEADERS
DEFENDER 02MY 3.1
E ARTH POINTS  AND HEADERSGeneral
The following illustration indicates the general position of each earth point and header on the 
vehicle. Refer to the Connector  section for more information.
Refer to the  Circuit Diagrams  for details of electrical components and their associated 
earth points. 

EARTH POINTS AND HEADERS
3.2DEFENDER 02MY 

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.1
DE SCRIP TION AND OPERATIONANTI–THEFT ALARM AND CENTRAL DOOR LOCKING (CDL)
DESCRIPTION
General
Defender now features an enhanced 10AS anti-theft alarm system, which incorporates 
Central Door Locking (CDL) in addition to perimetric and volumetric protection. The 
perimetric alarm function monitors the hinged panels of the vehicle. If any of the doors or the 
bonnet are opened while the alarm is armed, the alarm will be triggered. The volumetric 
alarm function...

DESCRIPTION AND OPERATION
4.2DEFENDER 02MY
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to the following on an N wire:

Fuse 6

Fuse 7

Fusible link 1

Fusible link 5.
All are located in the under seat fuse box.
Fuse 6 (C0574) supplies a constant battery feed to the following:

The anti-theft alarm ECU (C1979 on LHD vehicles, C0057 on RHD vehicles) on a PN 
wire

The Battery Backed-Up Sounder (BBUS) (C0666) on a PN then B wire

The anti-theft alarm relay...

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.3
Door Switches
In order for the perimetric alarm system to operate, the anti-theft alarm ECU monitors the 
condition of the door switches. The door switches are open circuit when the doors are 
closed. When the doors are opened, the switches close and an earth path is created. The 
anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) is connected to the door switches as 
follows:

To the driver door switch (C0266 on LHD, C2007 on RHD) on an SW wire

To the front...

DESCRIPTION AND OPERATION
4.4DEFENDER 02MY
Battery Backed-Up Sounder (BBUS)
Fuse 6 of the under seat fuse box (C0574) provides a constant battery feed to the BBUS 
(C0666) on a PN then B wire. The BBUS (C0666) is earthed on a B wire.
The anti-theft alarm ECU (C1980 on LHD, C0057 on RHD) provides a battery voltage feed 
to the BBUS (C0666) on an OW then B wire. If the alarm is triggered, the anti-theft alarm 
ECU withdraws the feed and replaces it with an earth. By pulsing the feed/earth path, the...

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.5
Anti-theft Alarm LED
The anti-theft alarm LED is located in the instrument pack, and is supplied a constant battery 
feed from fuse 30 of the passenger compartment fuse box (C0595) on a PN then NU wire. 
The earth path for the LED (C1060) is controlled by the anti-theft alarm ECU (C1980 on 
LHD, C0057 on RHD) on a K wire. To extinguish the LED, the ECU supplies a voltage equal 
to that of battery voltage along the K wire. To illuminate the LED, the ECU...

DESCRIPTION AND OPERATION
4.6DEFENDER 02MY
Door Lock Motors
When the anti-theft alarm ECU (C1980 on LHD, C0057 on RHD) receives a valid lock signal 
from the RF handset, it provides a feed to the following on K wires:

To the driver door lock motor (C0342)

To the front passenger door lock motor (C0327)

To the RH rear passenger door lock motor (C1996)

To the LH rear passenger door lock motor (C1996)

To the tail door lock motor (C0617).
NOTE: The RH rear and LH rear door lock motors have the same...

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.7
ENGINE IMMOBILISATION
DESCRIPTION
Introduction
The function of the immobilisation system is to prevent unauthorised starting of the vehicle. 
The system is controlled by the anti-theft alarm ECU in conjunction with the Engine Control 
Module (ECM) on Td5 vehicles, or the immobilisation ECU on 300 Tdi vehicles. Re-
mobilisation is achieved by a transponder in the vehicle key, which is read by a transponder 
coil when the ignition switch is turned to the ignition...