Land Rover Defender 2002 Electrical Library Rover Manual

DESCRIPTION AND OPERATION
4.18DEFENDER 02MY
STARTING AND CHARGING – Td5
DESCRIPTION
Starting
The starting system on the vehicle comprises a 12 volt starter motor which drives the engine 
to start the combustion process. The starter converts electrical energy into mechanical 
power. The vehicle electrical system must be capable of supplying sufficient power to enable 
the engine to be cranked.
Charging
The charging system comprises a battery and an alternator. The battery must be of a 
sufficient capacity...

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.19
Starting
Glow Plug Relay
The energised main relay (C0063) provides a feed to the glow plug relay (C0215) on an NO 
wire. The earth path for the glow plug relay coil (C0215) is controlled by the Engine Control 
Module (ECM) (C0158) on a GU wire. The ECM provides an earth path for the relay coil to 
control both pre and post heat. Pre-heat is determined by battery voltage and engine coolant 
temperature. Post heat is determined solely by engine coolant...

DESCRIPTION AND OPERATION
4.20DEFENDER 02MY
Charging
Alternator
Feed from the positive battery terminal (C0192) is supplied to the alternator (C0183) via the 
starter motor (C0178) on an R then N wire.
When the engine is started, the magnetised rotor within the stator windings generate 3 
phase alternating current (ac) and voltage that rises rapidly with rotor speed. The field 
diodes in the rectifier pack convert the ac current into direct current (dc). Output current from 
the field diodes supplements...

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.21
ANTI–LOCK BRAKING SYSTEM (ABS)
DESCRIPTION
General
The Anti-lock Braking System (ABS) fitted to Defender operates three features:

Anti-lock braking

Electronic Brake force Distribution (EBD)

Traction Control (TC).
The anti-lock braking system (ABS) is controlled by the ABS ECU, which is located beneath 
the RH front seat. The  ABS ECU receives wheel speed information from the wheel speed 
sensors and monitors deceleration when the brakes are applied. If...

DESCRIPTION AND OPERATION
4.22DEFENDER 02MY
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 1 and fusible link 
5 of the under seat fuse box (C0632) on an N wire. Fusible link 1 is connected in series with 
fusible link 4 and fuse 1, which are also located in the under seat fuse box. Fuse 1 (C0573) 
provides a constant battery feed to the ABS ECU (C0504) on an NW wire. Fusible link 4 
(C0571) provides a constant battery feed to the ABS modulator...

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.23
ABS ECU and Modulator
The ABS ECU (C0506) provides outputs to the ABS modulator (C1591 on LHD, C0501 on 
RHD) as follows:

The ABS modulator LH front outlet valve is driven by the ABS ECU via an SW wire.

The ABS modulator LH front inlet valve is driven by the ABS ECU via an SR wire.

The ABS modulator RH front outlet valve is driven by the ABS ECU via an SG wire.

The ABS modulator RH front inlet valve is driven by the ABS ECU via an SU wire.

The ABS...

DESCRIPTION AND OPERATION
4.24DEFENDER 02MY
Instrument Pack
ABS Warning Lamp
The ABS ECU (C0504) provides a feed to the instrument pack mounted ABS warning lamp 
(C0230) on an RS wire. The ABS ECU illuminates the warning lamp under the following 
conditions:

A bulb check when the ignition is switched on. The ABS ECU illuminates the lamp for 
0.3 seconds.  

If vehicle speed remains under 7 kph (4.3 mph) after the ignition has been switched on. 
When vehicle speed is greater than 7 kph, the ABS ECU will...

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.25
AIR CONDITIONING – 300 Tdi
DESCRIPTION
General
The air conditioning (A/C) system fitted to Defender operates independently of the standard 
heating and ventilation system. The A/C system is controlled by two rotary switches located 
on the driver side of the fascia; one switch controls blower speed, the other controls output 
temperature.
In order to gain maximum A/C system performance, the standard heater blower control 
should be set to 0, and both the...

DESCRIPTION AND OPERATION
4.26DEFENDER 02MY
Fuse 15 (C0580) provides an ignition feed to the following on WG wires: 

The blower motor relay (C0153)

The air conditioning unit (C1273)

The blower motor switch (C1508)

The air conditioning temperature control switch (C0275)

The compressor clutch relay (C1268)

The cooling fan relay (C0019).
Blower Motor
The blower motor relay coil (C0153) receives an ignition feed from fuse 15 of the passenger 
compartment fuse box (C0580) on a WG wire. The relay coil...

DESCRIPTION AND OPERATION
DEFENDER 02MY 4.27
Temperature Control
The temperature control switch relays operator input to the air conditioning unit, to control 
A/C system temperature output. The switch (C0275) receives an ignition feed from fuse 15 
of the passenger compartment fuse box (C0580) on a WG wire. 
When the switch is turned to position 1, a feed is provided to the air conditioning unit (C1273) 
on a UY wire. When the switch is turned to position 2, a feed is provided to the air 
conditioning...