Defender Electric Diagrams. Manual — part 101
INTRODUCTION
1.4
DEFENDER 1999 MY
Connectors and Harnesses - The engine compartment of a vehicle is a
particularly hostile environment for electrical components and connectors.
Always ensure these items are dry and oil free before disconnecting and
connecting test equipment. Never force connectors apart either by using tools
or by pulling on the wiring harness. Always ensure locking tabs are disengaged
before removal and note orientation to enable correct reconnection. Ensure
that any protective covers and substances are replaced if disturbed.
Before removing a faulty component, refer to the Workshop Manual for removal
procedures. Ensure the starter switch is turned to the "OFF" position, the
battery is disconnected (see Battery disconnecting) and any disconnected
harnesses are supported to avoid any undue strain at terminals. When
replacing the component keep oily hands away from electrical connection
areas and push connectors home until any locking tabs fully engage.
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.
CAUTION: To prevent damage to electrical components ALWAYS
disconnect the battery when working on the vehicle electrical
system. The earth lead must be disconnected first and reconnected
last. Always ensure that battery leads are routed correctly and are not
close to any potential chafing points.
Battery charging
Recharge the battery out of the vehicle and keep the top well ventilated. While
being charged or discharged, and for approximately fifteen minutes afterwards,
batteries emit hydrogen gas. This gas is inflammable.
Always ensure any battery charging area is well ventilated and that every
precautions is taken to avoid naked flames and sparks.
INTRODUCTION
DEFENDER 1999 MY
1.5
Disciplines
Switch off ignition prior to making any connection or disconnection in the
system as electrical surge caused by disconnecting ’live’ connections can
damage electronic components.
Ensure hands and work surfaces are clean and free of grease, swarf, etc. as
grease collects dirt which can cause tracking or high-resistance contacts.
When handling printed circuit boards, treat them as you would a brake disc -
hold by the edges only; note that some electronic components are susceptible
to body static.
Connectors should never be subjected to forced removal or refit, especially
inter-board connectors, damaged contacts will cause short-circuit and open-
circuit conditions.
Prior to commencing test, and periodically during test, touch a good earth, i.e.
cigar lighter socket, to discharge body static as some electronic components
are vulnerable to static electricity.
Grease for electrical connectors
All under bonnet and under body connectors are protected against corrosion by
the application of a special grease on production. Should connectors be
disturbed in service or repaired or replaced, a grease of this type, available
under Part No. BAU 5811, should again be applied.
NOTE: The use of other greases must be avoided as they can
migrate into relays, switches etc. contaminating the contacts and
leading to intermittent operation or failure.
INTRODUCTION
1.6
DEFENDER 1999 MY
ABBREVIATIONS
A
- Amps
ABS
- Anti-lock braking system
ac
- Alternating current
A/C or Aircon
- Air conditioning
BBUS
- Battery backed up sounder
Cav
- Cavity
Cct
- Model or feature applicability
Col
- Colour
dc
- Direct current
ECU
- Electronic control unit
ECM
- Engine control module
EGR
- Exhaust gas recirculation
EKA
- Emergency key access
HRW
- Heated rear window
IACV
- Idle air control valve
ICE
- In-car entertainment
LED
- Light emitting diode
LH
- Left hand
LHD
- Left hand drive
Link
- Fusible link
MFi
- Multiport fuel injection
MY
- Model year
No.
- Number
RF
- Radio frequency
RH
- Right hand
RHD
- Right hand drive
RWW
- Rear wash wipe
SFi
- Sequential fuel injection
TP
- Throttle position sensor
V
- Volts
INTRODUCTION
DEFENDER 1999 MY
1.7
HOW TO USE THIS DOCUMENT
Fuse details
Contains information on fuse functions and values and should be used together
with the power distribution circuit diagrams to establish which systems share a
common power supply and to ensure that correct value fuses are fitted.
Earth points and headers joints
Shows a plan view of the vehicle including location of all earth points.
Supporting photographs and connector detail information appear in the
Connector section.
Description and operation
Presented in the same order as the circuit diagrams are displayed in the
Electrical Circuit Diagram folder, each of the descriptions contains a brief
overview of the main system functions and includes operating parameters for
sensors and switches and reference to the appropriate wire colours. Always
read this section before starting work on a system so that a good
understanding of system functionality is obtained.
Connector
This section is effectively an index of every electrical connector on the vehicle,
including header joints and eyelets. A page is dedicated to each connector,
with the information presented in a standard format including display of the
connector number on each page header to ease reference. Some derivatives
within the model range may have connectors which have been allocated
identical numbers to those already used, but are located in a different position
on the vehicle. Where possible these connectors are displayed on adjacent
pages together with an alternative location statement, a qualifying statement
and an accompanying photograph.
Connector information comprises:
•
Connector number - The assigned number, prefixed "C".
•
Connector name - Usually derived from the component to which the
connection is made.
•
Male/Female - If applicable, identifies the gender of the connector pins
(NOT the housing) as Male or Female. Generally, connectors mating
directly to a component have Female pins.
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