Land Rover Discovery 99my To 03my Electrical Library 3rd Edition Rover Manual

Discovery
Electrical Library
LRL 0529 NDERL03MY  22/2/02  12:23 pm  Page 2 

DISCOVERY 99MY to 03MY
ELECTRICAL LIBRARY
LRL0529ENG(3)
Published by Land Rover
© Land Rover 2003
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form, electronic, mechanical, 
recording or other means without prior written permission from Land Rover. 

CONTENTS
DISCOVERY SERIES II 1
INTRODUCTION ........................................................................... 1.1
ABOUT THIS DOCUMENT  ............................................................................... 1.1
ELECTRICAL PRECAUTIONS  ......................................................................... 1.3
HARNESS REPAIRS  ........................................................................................ 1.6
ABBREVIATIONS...

CONTENTS
2DISCOVERY SERIES II
SUPPLEMENTARY RESTRAINT SYSTEM (SRS)  ......................................... 4.75
AIR CONDITIONING (A/C)  ............................................................................. 4.77
HEATER BLOWER - FRESH/RECIRCULATED AIR MOTOR 
(NON A/C VEHICLES)  .................................................................................... 4.84
FUEL BURNING HEATER (FBH) - Td5 ONLY  ............................................... 4.87
COOLING FAN...

INTRODUCTION
DISCOVERY SERIES II 1.1
INTRODUCTIONABOUT THIS DOCUMENT
GENERAL
This document is intended to assist in diagnosing electrical faults, and should be used in 
conjunction with the Electrical Circuit Diagrams. The document is divided into the following 
sections:
1.INTRODUCTION – includes Electrical Precautions, a list of Abbreviations and general 
information on how to use the document.
2.FUSE DETAILS – provides details of location, rating in Amperes and circuit(s) 
protected.
3.EARTH POINTS...

INTRODUCTION
1.2DISCOVERY SERIES II
Battery voltage
Open Circuit Voltage Test
Before commencing diagnosis of electrical problems, verify the condition of the battery is 
acceptable by using the open circuit voltage test.
1. Switch off all electrical loads on the vehicle.
2. Adjust digital multimeter to read dc volts on the appropriate scale.
3. Connect test probes across battery terminals ensuring that polarity is correct and 
record the voltage displayed.
A reading of 12.3V or more is acceptable; any...

INTRODUCTION
DISCOVERY SERIES II 1.3
ELECTRICAL PRECAUTIONS
General
The following guidelines are intended to ensure the safety of the operator whilst preventing 
damage to the electrical and electronic components fitted to the vehicle. Where necessary, 
specific precautions are detailed in the relevant sections of this document, reference to 
which should be made prior to commencing repair operations.
Equipment – Prior to commencing any test procedure on the vehicle, ensure that the 
relevant test...

INTRODUCTION
1.4DISCOVERY SERIES II
Battery disconnecting
Before disconnecting the battery, switch off all electrical equipment. If the radio is to be 
serviced, ensure the security code has been deactivated. When the battery is disconnected, 
certain data such as radio code, clock time, °C/°F on ATC panel and adaptive setups will be 
lost. On vehicles with battery backed-up sounder (BBUS) fitted, if the battery is disconnected 
with the alarm armed, the BBUS will sound.
CAUTION: To prevent damage to...

INTRODUCTION
DISCOVERY SERIES II 1.5
Grease for electrical connectors
Some under bonnet and under body connectors are protected against corrosion by the 
application of a special grease during production. Should connectors of this type be 
disturbed, repaired, or replaced, a grease of this type, available under part number BAU 
5811, should again be applied. Do not apply grease to any connectors that do not have 
grease applied as standard.
NOTE: The use of other greases must be avoided as they can...