key LAND ROVER DISCOVERY 1995 Service Manual

86ELECTRICAL
8
DESCRIPTION AND OPERATION DETECTION COMPONENTS
Switches
Perimetric protection for the vehicle is provided by
ECU inputs connected to the following:
Key switches (including starter)
Sill buttons
Bonnet switch
Door switches
Ultrasonic sensor
The ultrasonic sensor is located on the interior light
switch panel and triggers the alarm if movement is
detected.
WARNING INDICATORS
Battery backed-up sounder
The battery backed-up sounder is located in the
engine compartment and provides an audible warning
whenever the alarm is triggered.
NOTE: Disconnecting the vehicle battery
will result in the alarm sounding if the
correct procedure has not been followed.
See Repair, Battery.
Engine immobilisation warning light (EIWL)
The engine immobilisation warning light is located in
the instrument pack and provides a visual indication
that the engine is immobilised.
Anti-theft alarm indicator light
The anti-theft alarm indicator light is located in the
instrument pack and provides a visual indication of the
alarm status.
Inertia switch and central door locking
As a safety feature, the alarm system is designed to
recognise the inertia switch and via the ECU, unlock
the doors in the event of a collision.
NOTE: This feature only applies when the
starter switch is in the on position.ANTI-THEFT ALARM OPERATION (96 MODELS)
Full arming and immobilisation
Locking the vehicle using the handset immobilises the
engine and initializes both volumetric and perimetric
protection, providing:
1.After a lock signal has been received, a period of
15 seconds has elapsed during which no
movement is detected inside the vehicle;
2.No door or bonnet is open.
NOTE: If either of the above conditions are
not satisfied, the alarm will only be
partially armed. This is a mislock condition
which will be made apparent by a delay of 10
seconds before the anti-theft alarm indicator
begins to flash.
Disarming the alarm
NOTE: ALWAYS disarm the alarm using
the handset.
Unlocking with the key will not disarm the alarm or
mobilise the vehicle. If the handset fails to unlock the
vehicle
See Repair, Handset.
Partial arming and immobilisation
The alarm will be partially armed and the engine
immobilised if the vehicle is locked with the handset or
key, if:
1.After a lock signal has been received, a period of
15 seconds has elapsed during which movement
is detected inside the vehicle;
2.A door or bonnet is open.
NOTE: This is a mislock condition which
will be made apparent by a delay of 10
seconds before the anti-theft alarm
indicator begins to flash. Subsequent closure of
the offending aperture will cause the alarm to
attempt full arming as previously described.
Immobilisation
The vehicle will be automatically immobilised
whenever any of the following conditions occur:
1.The vehicle is locked using the handset.
2.The vehicle is locked using the key.
3.Thirty seconds after the starter switch has been
turned off AND the driver's door opened.
4.Five minutes after the starter switch is turned off
or the alarm disarmed.

ELECTRICAL
9
DESCRIPTION AND OPERATION Mobilisation
The vehicle can be mobilised using any one of the
following processes:
1.Placing the handset in close proximity to the
starter switch with the starter switch turned on
(normally achieved by placing the key in the
starter switch, providing the key and handset are
attached).
NOTE: Under normal circumstances the
remobilisation of the vehicle will not be
apparent.
2.Pressing unlock button on handset.
3.Pressing lock button on handset with starter
switch turned on.
4.Entry of EKA code using the key.
NOTE: Any attempt to start the vehicle
using the key (detached from the handset)
will be unsuccessful. Use one of the above
methods.
See Warning indicators.
Volumetric protection
When the vehicle is locked using the handset both
perimetric and volumetric protection are activated
providing there is no mislock condition.
Perimetric protection
The vehicle is always perimetrically protected when
the alarm is armed using the handset. Perimetric
protection only, can be achieved if the vehicle is
locked using the key.
NOTE: The handset should ALWAYS be
used for unlocking the vehicle. If the
handset fails to unlock the vehicle
See
Repair, Handset.
Battery backed-up sounder (BBUS)
The sounder provides audible indication of alarm
status including:
Anti-theft warnings;
Confirmation of access to built-in test.
NOTE: Disconnecting the vehicle battery
will result in the alarm sounding if the
correct procedure has not been followed.
See Repair, Battery.
Alarm horn
The horn provides audible indication (as BBUS) of
alarm status.
NOTE: Disconnecting the vehicle battery
will have no effect on the horn.
Engine immobilisation warning light (EIWL)
NOTE: Under normal circumstances the
light will not illuminate.
The light will only illuminate (after 2 seconds) if the
handset is detached from the key (or the handset
fails) and an attempt is made to start the vehicle.
Anti-theft alarm indicator light
The light flashes to indicate the alarm status.
If the alarm system is fully armed, the light will flash
rapidly for 10 seconds and then settle to the slow
(anti-theft deterrent) flash.
If the alarm system is perimetrically armed, the light
will intermittently flash rapidly for 10 seconds and then
settle to the slow (anti-theft deterrent) flash.
If the alarm system is partially armed, the light will
NOT emit the slow flash until 10 seconds after arming
(to allow the cause to be investigated).
If the vehicle has been left unlocked, providing the
driver's door is closed, the light will flash slowly
indicating immobilisation. If the driver's door is open,
the light will remain illuminated.
Emergency key access (EKA)
The emergency key access code should be entered in
accordance with the instructions in the Owner's
Handbook.

ELECTRICAL
11
DESCRIPTION AND OPERATION ANTI-THEFT ALARM BUILT-IN TEST (96 MODELS)
NOTE: The handset should be detached
from the key to allow perimetric testing of
the alarm system. The system will
automatically switch to volumetric testing if the
handset is in close proximity to the starter switch.
The built-in test procedure can be accessed providing
the following conditions exist:
Alarm disarmed.
Ignition off.
Doors unlocked.
Bonnet[hood] closed.
The test mode can be entered by completing the
following instructions within 5 seconds:
1.Open bonnet.
2.Turn starter switch on.
3.Open driver's door (far enough to activate
switch).
4.Turn starter switch off.
5.Turn starter switch on.
If the test mode has been correctly accessed, the
sounder/horn will operate briefly and the anti-theft
alarm indicator and hazard warning lights will flash.
Perimetric tests
The anti-theft alarm indicator light and the hazard
warning lights will flash when:
1.Door switches are activated;
2.The bonnet is opened;
3.Sill switches are activated;
4.Key switches are activated.
NOTE: Operation of key switches can be
verified by turning the key in the relevent
direction so as not to simultaneously
activate the sill switch. If the key switch changes
state, the change should be detected but the sill
switch will not be activated.
Volumetric tests
Press the unlock button or move the handset close to
the starter switch to disable perimetric testing and
enable volumetric testing. If movement is detected
within the vehicle by the ultrasonic sensor it will be
indicated by flashing the anti-theft alarm indicator and
hazard warning lights.
NOTE: Exit anti-theft alarm built-in test by
turning starter switch to the off position.

ELECTRICAL
3
FAULT DIAGNOSIS 1 2 3 4 SUSPECT
L * * * DISCHARGED BATTERY
* L L * IGN. SWITCH AND/OR
WIRING
* * L * COIL OR AMPLIFIER
* * * H AMPLIFIER GROUND
Key
*Expected Voltage
HVoltage higher than expected
LVoltage lower than expectedTEST 3:
Amplifier Switching
Connect voltmeter between battery positive (+ve)
terminal and H.T. coil negative (-ve) terminal.
Voltmeter should register 0 volts.
Switch ignition 'On', voltmeter should still register 0
volts.
Crank engine, voltmeter reading should increase
when cranking, in which case proceed to Test 5.
If no increase in voltage during cranking proceed to
Test 4.

ELECTRICAL
11
REPAIR HANDSET INITIALISATION
NOTE: New handsets are supplied in pairs.
If a new handset is required, it will require
initialisation to the ECU using the
following procedure:
1.Starting conditions: ignition off, doors unlocked,
bonnet switch depressed.
2.Carry out instructions 3. to 9. within 8 seconds.
3.Switch ignition ON.
4.Switch ignition OFF.
5.Lock doors.
6.Unlock doors.
7.Release bonnet switch.
8.Switch ignition ON.
9.Switch ignition OFF.
If alarm is correctly accessed, horn will sound and
LED will light. It is now possible to programme two
handsets of correct frequency to vehicle alarm ECU.
This must be carried out within two minutes.
10.Press and hold down button on first handset until
dash LED flashes.
11.Repeat instruction 10. for second handset.
12.The LED will extinguish if both handsets have
been initialised correctly.CENTRAL DOOR LOCKING
Where electrically operated central door locking is
fitted, locking or unlocking the drivers door from
outside by key operation, or from the inside with the
sill knob automatically locks or unlocks the passenger
and rear doors.
Front and rear passenger doors can be independently
locked or unlocked from inside the vehicle by sill knob
operation but can be overidden by further operation of
the driver's door locking control.
On rear doors, where side facing fold down seats are
fitted, a child safety lock is provided which can be
mechanically pre-set to render the interior door
handles inoperative.
Failure of a door actuator will not affect the operation
of the remaining doors and the door with the
inoperative actuator can still be locked or unlocked
manually.
The actuator unit fitted to the driver's door is the
master actuator and is identified from the actuators
fitted to the passenger and rear doors by having a
white connecting link, whereas the passenger and
rear door actuators have grey coloured connecting
links.
NOTE: Actuator units are non-servicable, if
a fault should occur replace the unit with a
new one.

ELECTRICAL
15
REPAIR Refit
9.If removed fit the mounting plate to the actuator.
10.Engage the actuator operating rod with hooked
end of the actuator link.
11.Fit the actuator and mounting plate to the door
and loosely secure with the four screws.
12.Set the mounting plate with the screws in the
centre of the slotted holes, then tighten the
screws.
13.Connect the actuator lead to the door harness.
14.Reconnect battery negative lead.
15.With the sill locking button held in position, set
the bellcrank to approximately the position it
would be in if the sill button was depressed to
half of its total movement.
16.At this setting check the electrical operation of
the door lock. Adjust the mounting plate as
necessary to achieve the correct setting. Fully
tighten the securing screws on completion.
17.Refit the vapour barrier.
18.Connect the sill button operating rod to the
bellcrank, hold in position, fit the door trim panel
and the door pull.
BULB REPLACEMENT
For bulb type and rating refer to rating shown on the
bulb or bulb replacement list.
See GENERAL
SPECIFICATION DATA, Information, Bulbs
HEADLIGHT
Service repair no - 86.40.02/13
Remove
1.Rotate three retaining clips 10 degrees, to align
with slots in headlight mounting plate.
2.Withdraw light unit
NOTE: Detach adjustment operating rod
on vehicles fitted with headlight levelling.3.Disconnect electrical multiplugs and remove
headlight unit.
4.Release spring clips and withdraw headlight
bulb.
Key
1. Headlight
2. Retaining clips
3. Bulb
4. Spring clip
5. Cover
6. Bulb sidelight
7. Plug
8. Plug sidelight
Refit
5.Reverse removal procedure.

ELECTRICAL
17
REPAIR REAR LIGHT UNIT
Service repair no - 86.40.74
Remove
1.Pull out side facing seat or pocket cover.
2.Unscrew fastener and remove access panel.
3.Disconnect wiring harness multi-plug from light
unit.
4.Remove retaining nuts and withdraw light unit
from rear of vehicle.
Key
1. Access panel
2. Multiplug
3. Retaining nut
4. Bulb holder
5. Bulb
Refit
5.Reverse removal procedure. Ensure that the
rubber seal is seated correctly.STOP, REVERSING, FOG GUARD BULBS
Service repair no - 86.40.74
Remove
1.Pull out side facing seat or pocket cover.
2.Unscrew fastener and remove access panel.
3.Turn bulb holder anti-clockwise to release.
4.Remove bulb.
NOTE: On vehicles fitted with rear air
conditioning remove access panel
housing rear loadspace light to gain
access.
Key
1. Access panel
2. Multiplug
3. Retaining nut
4. Bulb holder
5. Bulb
Refit
5.Reverse removal procedure.

ELECTRICAL
43
REPAIR ANTI-THEFT ALARM ECU (96 MODELS)
Service repair no - 86.55.85
Remove
1.Remove 4 studs securing fascia left hand
closing panel.
2.Remove closing panel.
3.Disconnect 2 multiplugs from ECU.
4.Remove nut securing ECU/relay bracket.
5.Lower bracket.
6.Remove 2 nuts securing ECU to bracket.
7.Remove ECU.
NOTE: A new ECU must be initialised
using TestBook.
Refit
8.Reverse removal procedure.HANDSET (96 MODELS)
If vehicle does not respond to handset immediately, it
may have lost synchronisation. To re-synchronise,
press either button, 4 times in quick succession. If
handset still fails to respond, check batteries, refer to
Owner's handbook. If batteries are okay, it may be
necessary to use emergency key access, refer to
Owner's handbook.
NOTE: New handsets must be initialised
using TestBook.
PASSIVE COIL (96 MODELS)
Service repair no - 86.77.35
Remove
1.Remove steering column shroud.
See
STEERING, Repair, Steering column shroud
2.Release multiplug from harness clip and
disconnect.
3.Release passive coil from starter switch.
4.Remove bulb holder/starter switch shroud.
5.Remove coil.
Refit
6.Fit coil, ensuring switch illumination bulb harness
passes through large cut-out.
7.Secure coil with cable tie.
8.Position bulb holder/starter switch shroud and
locate bulb.
9.Locate bulb holder/starter switch shroud,
ensuring cut-out in shroud aligns with lug on
starter switch.
10.Connect multiplug and secure to clip.
11.Fit column shroud.

86ELECTRICAL
2
OVERHAUL
LUBRICATION
Apply clean engine oil:
a. A spot into rotor spindle before fitting rotor
arm.
Apply Omnilube 2 (or equivalent) grease.
b. Auto advance mechanism.
c. Pick-up plate centre bearing.
d. Pre tilt spring and its rubbing area (pick-up
and base plate assembly).
e. Vacuum unit connecting peg (pick-up and
base plate assembly).
f. Connecting peg hole in vacuum unit
connecting rod.
Fitting pick-up and base plate assembly
1.Pick-up leads must be prevented from fouling
rotating reluctor. Both leads should be located in
plastic guide as illustrated. Check during
re-assembly.
Fitting reluctor
2.Slide reluctor as far as it will go on rotor shaft,
rotate reluctor until it engages with coupling ring
beneath pick-up base plate. Distributor shaft,
coupling ring and reluctor are 'keyed' and rotate
together. Fit 'O' ring, flat washer and retaining
circlip.Pick-up air gap adjustment
1.Air gap between pick-up limb and reluctor teeth
must be set within specified limits, using a
non-ferrous feeler gauge.
2.If adjustment is necessary, loosen two barrel
nuts to set the air gap.
See ENGINE TUNING
DATA, Information, Engine 3.9 V8i
NOTE: When original pick-up and base
plate assembly has been refitted, air gap
should be checked, and adjusted if
necessary.
When fitting a new assembly air gap will require
adjusting to within specified limits.
Amplifier module
1.Before fitting module, apply MS4 Silicone grease
or equivalent heat-conducting compound to
amplifier module backplate, seating face on
distributor body and both faces of heatsink
casting.