1996 LAND ROVER DEFENDER warning light

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Page 416 of 455

LAND ROVER DEFENDER 1996 Workshop Manual 86ELECTRICAL
4
DESCRIPTION AND OPERATION REV: 05/99 ALARM SYSTEM COMPONENT LOCATION
COMPONENT LOCATION
1. Electronic control unit (ECU) Under dash, LH and RH drive
2. Anti-theft alarm indicator light

Page 418 of 455

LAND ROVER DEFENDER 1996 Workshop Manual 86ELECTRICAL
6
DESCRIPTION AND OPERATION REV: 05/99 ENGINE IMMOBILISATION
Engine immobilisation is an important aspect of the
vehicles security system, and occurs automatically
whenever the alarm sys

86ELECTRICAL
6
DESCRIPTION AND OPERATION REV: 05/99 ENGINE IMMOBILISATION
Engine immobilisation is an important aspect of the
vehicle's security system, and occurs automatically
whenever the alarm system is armed.
The system also includes a feature known as 'passive
immobilisation', which is designed to safeguard the
vehicle from theft should the driver forget to arm the
alarm.
Passive immobilisation occurs automatically as
follows:
·Thirty seconds after the starter switch has been
turned off and the driver's door opened.
·Five minutes after the starter switch is turned off or
the alarm system is disarmed.
If the engine has immobilised passively,
re-mobilisation will occur when the starter switch is
turned to position 'II', provided the handset is on the
same ring as key and in close proximity to the switch.
ALWAYS keep the handset on the same ring as the
key.
NEVER attach both handsets to the same key ring.
Any attempt to start the engine while it is immobilised
will cause the engine immobilisation warning light to
flash.
Engine immobilisation override
If the handset is lost or fails to operate, the engine
immobilisation can be overridden by using the starter
key to enter the four digit emergency access code.
The procedure for entering the code is described after
the following note:
NOTE: If the handset is lost or inoperative,
it is impossible to disarm the alarm. As
soon as the door is opened, the alarm will
sound (continuously for up to three 30 second
periods), and continue while the code is being
entered.
1.With the driver's door closed, insert the key into
the starter switch.
2.Turn the switch to position 'II' the required
number of times to enter first digit of code (if first
digit is 4, turn key to position 'II' and then back to
'0' four times.
3.Open the driver's door (to enter first digit) and
then close the door again.
4.Turn the starter switch to position 'II' and back to
'0' the required number of times to enter
SECOND digit of code.
5.Open the driver's door (to enter second digit)
and then close the door again.
6.Turn the starter switch to position 'II' and back to
'0' the required number of times to enter THIRD
digit of code.
7.Open the driver's door (to enter third digit) and
then close door again.
8.Turn the starter switch to position 'II' and back to
'0' the required number of times to enter
FOURTH digit of code.
9.Finally, open and close the driver's door. If the
code has been entered correctly, the anti-theft
indicator light will extinguish, the engine can be
started and the alarm will disarm.
If an incorrect code has been entered:
If the code is entered incorrectly, the anti-theft
indicator light will continue to illuminate and the
engine will fail to start. Before entering the code again,
turn the starter switch to position 'II', hold in this
position for 5 seconds and then switch off.
After three failed attempts, the security system
invokes a delay period of thirty minutes during which
the system will not accept any further codes.

Page 419 of 455

LAND ROVER DEFENDER 1996 Workshop Manual ELECTRICAL
7
DESCRIPTION AND OPERATION ALARM SYSTEM FUSES
When the vehicle immobilisation and alarm system is
fitted, three fuses are used to protect the circuit:
·Alarm system 15 amp fuse, main harn

Page 421 of 455

LAND ROVER DEFENDER 1996 Workshop Manual ELECTRICAL
9
DESCRIPTION AND OPERATION IMMOBILISATION AND ALARM SYSTEM CIRCUIT
DIAGRAM
1.Anti-theft alarm indicator light (LED)
2.Engine immobilisation warning light
3.Alarm system fuse - 15 amp
4.Ala

Page 423 of 455

LAND ROVER DEFENDER 1996 Workshop Manual ELECTRICAL
11
DESCRIPTION AND OPERATION IMMOBILISATION AND ALARM SYSTEM CIRCUIT
DIAGRAM - WITH DDS
1.Anti-theft alarm indicator light (LED)
2.Engine immobilisation warning light
3.Alarm system fuse -

Page 426 of 455

LAND ROVER DEFENDER 1996 Workshop Manual ELECTRICAL
1
REPAIR ELECTRICAL PRECAUTIONS
The following guidelines are intended to ensure the
safety of the operator whilst preventing damage to
electrical and electronic components fitted to the
veh

ELECTRICAL
1
REPAIR ELECTRICAL PRECAUTIONS
The following guidelines are intended to ensure the
safety of the operator whilst preventing damage to
electrical and electronic components fitted to the
vehicle.
Polarity
Never reverse connect the vehicle battery and always
observe the correct polarity when connecting test
equipment.
High voltage circuits
WARNING: Before commencing work on
an ignition system, all high tension
terminals, adaptors and diagnostic
equipment for testing should be inspected to
ensure that they are adequately insulated and
shielded to prevent accidental personal contacts
and minimize the risk of shock. Wearers of
surgically implanted pacemaker devices should
not be in close proximity to ignition circuits or
diagnostic equipment.
Whenever disconnecting live high tension circuits
always use insulated pliers and never allow the open
end of a high tension lead to come into contact with
other components particularly electronic control units.
Exercise caution when measuring the voltage on the
coil terminals while the engine is running, since, high
voltage spikes can occur on these terminals.
Connectors and harness
Always ensure that 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. Having confirmed a component to be faulty
switch-off the ignition and disconnect the battery.
Remove the component and support the disconnected
harness. 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.
Battery charging
Recharge the battery out of the vehicle and keep the
top well ventilated. While being charged or
discharged, and for approximately 15 minutes
afterwards, batteries emit hydrogen gas which is
flammable. Always ensure any battery charging area
is well ventilated and that every precaution is taken to
avoid naked flames and sparks.
GENERAL PRECAUTIONS
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 disc - hold by the edges only.
Prior to commencing a test, and periodically during a
test, touch a good earth, for instance, a cigar lighter
socket, to discharge body static as some electronic
components are vulnerable to static electricity.

Page 428 of 455

LAND ROVER DEFENDER 1996 Workshop Manual ELECTRICAL
3
REPAIR ELECTRONIC CONTROL UNIT (ECU)
Service repair no - 86.55.85
Remove
1.Remove LH front seat cushion.
2.Release retaining clip and remove battery
access cover.
3.Slacken battery negati

Page 429 of 455

LAND ROVER DEFENDER 1996 Workshop Manual 86ELECTRICAL
4
REPAIR HANDSET BATTERY
Service repair no - 86.77.13
Remove
1.Unlock vehicle and disarm alarm system.
2.Turn starter switch to position II.
3.Turn starter switch back to position 0 a

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