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Discovery electrical Manual - part 4

INTRODUCTION

[0]

X134
Ignition
Switch
[0] 0, off
[1] I, radio
[2] II, ignition
[3] III, start

[1]

[2]

[3] [0]

[1]

[2]

[3] [0]

[1]

[2]

[3]

Terminal number

Component designation

R" receives battery voltage
in positions I, II

Terminal
number

Designation

Battery voltage: Ignition
Switch in position III

Battery voltage: supplied
constantly

Battery voltage: Ignition
Switch in position II or III

Battery voltage: Ignition
Switch in positions I, II

Terminal
number

Designation

Switched battery voltage
through the ignition load reĆ
lay or accessory relay; igniĆ
tion switch is in position I or
II.

Flasher unit input

49aFla

sher unit output

56aHigh bea

56b

Low beam

End of relay coil

Start of relay coil

Relay contact

87a

Relay contact

Ground

Start

Headlamp

56d

Headlamp flash

Side lamps

INTRODUCTION

All components are identified by a letter
followed by an arbitrary number assigned to
the component. The letter assigned to the
component indicates the type of component.

Bulbs, Heated Screens,
Mirror Demisters, Cigar
Lighters, and Heated
Washer Jets

Definition of Vehicle Component Codes

Relays, Solenoids,
Speakers, and Resistors

Motors

Fuse Boxes and Fusible
Links

Switches and Sensors

Electronic Control Units,
Modules, Shields, Diodes,
and Capacitors

B Ć Black

G Ć Green

K Ć Pink
L Ć Light
N Ć Brown

O Ć Orange

P Ć Purple

R Ć Red

S Ć Grey
U Ć Blue
W Ć White

Y Ć Yellow

All wires are identified by letters which indicate
a certain colour. Wire colour and size will only
be shown once if it does not change throughĆ
out the circuit. The following chart explains the
wire colour abbreviations.

Wire Colours

B Ć Black

G Ć Green

K Ć Pink
L Ć Light
N Ć Brown

O Ć Orange

P Ć Purple

R Ć Red

S Ć Grey
U Ć Blue
W Ć White

Y Ć Yellow

Wire Colour Chart

A schematic page which follows another
schematic page of the same chapter will have
an arrow in the upper left hand corner. There
is no arrow on the first schematic page of a
chapter. Schematic pages which are followed
by another schematic page will have an arrow
in the lower right hand corner. If the page is
the last page of the chapter, there will be a
square instead of an arrow.

Previous and Next Arrows

Page Qualifiers

Schematic pages which are specific to certain
model, option or country variations will have a
small Qualifier" after the Previous Arrow in the
upper left-hand corner. For example, a section
might contain pages specific to petrol engines
and some pages specific to diesel engines.
Petrol" will be shown in the upper left hand
corner of petrol specific pages, and Diesel"
will be shown in the upper left hand corner of
diesel specific pages.

INTRODUCTION

Certain abbreviations are used throughout the
Electrical Troubleshooting Manual as circuit
qualifiers. The following list explains all
abbreviations used as qualifiers in the Circuit
Diagrams.
ABS

AntiĆLock Braking System

Circuit Qualifiers

LHD

Lefthand Drive

RHD

Righthand Drive

LWB

Long Wheel Base

SWB

Short Wheel Base

NAS

North American Countries

MFI-V8

Multiport Fuel Injection
(MFI-V8)

Certain abbreviations are used throughout the
Electrical Troubleshooting Manual as Switch
Position notes. The following list explains all
abbreviations used as Switch Position notes in
the Circuit Diagrams.

Switch Positions

< 100

Less than 100

> 100

More than 100

A/C

Air Conditioning

MFI-T16

Multiport Fuel Injection
(MFI-T16)

300 Tdi

Tdi Diesel

300 Tdi with
EGR

Tdi Diesel with Exhaust Gas
Recirculation (EGR)

300 Tdi without
EGR

Tdi Diesel without Exhaust
Gas Recirculation (EGR)

300 Tdi with
EDC

Tdi Diesel with Electronic
Diesel Control (EDC)

300 Tdi without
EDC

Tdi Diesel without ElectronĆ
ic Diesel Control (EDC) (apĆ
plies to Tdi Diesels with
and without EGR)

SFI-V8

Sequential Multiport Fuel
Injection (SFI-V8)

BBUS

Battery Backed Up Alarm
Sounder (Z272)

INTRODUCTION

ÉÉÉÉÉÉ

ÉÉÉ

100

400

300

200

500

700

600

800

ÉÉÉ

200

100

300

400

Connector, Ground, and Splice Identification by Location

Connectors, Grounds, and Splices are identified by a letter followed by a number.
Connectors are identified by C, grounds by E, and splices by S. Some splices are
contained in junction connectors. These splices are identified by the prefix HJ" below
the splice's reference number. The number assigned to the connector, ground, or splice
corresponds to its location in the vehicle.

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