1995 LAND ROVER DISCOVERY reset

86ELECTRICAL
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DESCRIPTION AND OPERATION ANTI-THEFT SYSTEM FUNCTION
Perimetric protection
Using the key in the correct sequence will turn on and
off perimetric protection only. When fully perimetrically
armed, all doors, and bonnet [hood] are protected
against unauthorised access. If the door key is used in
the normal manner the driver will be unaware of the
door key sequence. The time taken to lock or unlock
with the key must be less than 5 seconds. To prevent
unauthorised tampering, the alarm will sound if the
key is held in the unlocked position for longer than 5
seconds when armed. Cranking is disabled when
perimetric protection is armed.
NOTE: When key is turned left or right the
keyswitch input will be activated, in
conjunction with the sill button switch
when links are operated.
Volumetric protection
Using the handset transmitter will turn on and off
volumetric protection. In volumetric mode the vehicle
interior is protected using the ultrasonic sensor. Using
the handset also arms and disarms the vehicle
perimetrically. Cranking is disabled when volumetric
and perimetric protection is armed.
NOTE: If armed volumetrically the vehicle
CANNOT be disarmed using the key.
Alarm horn
When an intrusion is detected the alarm horn will
sound intermittently (Switzerland and Denmark
continuous horn sound) and the hazard lights flash
(where territorial regulations allow) for 30 seconds.
The alarm must be retriggered before alarm horn will
sound again.Vehicle status indication
Vehicle status is indicated by up to three devices: (a)
alarm horn, (b) hazard lights, (c) dash board LED.
When the vehicle arms in either mode the hazard
lights will flash three times and the LED will flash
rapidly for 10 seconds. LED will then flash at a slower
rate while vehicle is armed. When the vehicle disarms,
hazard lights will flash once and LED will extinguish. If
LED remains lit, it indicates that the alarm has been
triggered. Turning on ignition or arming the alarm will
extinguish LED. The LED will give a long pulse flash
to indicate the ultrasonic unit being activated.
Central locking
Central locking is controlled by the alarm ECU and
may be operated by the key, sill button(s) or handset.
The system works on both front doors on four door
vehicles or driver's door on two door vehicles.
NOTE: The central door locking system
will shut down for a short period after
more than 15 consecutive operations.
Inertia switch
An inertia switch is incorporated in the alarm system
ECU. If ignition is on and the vehicle receives an
impact sufficient to activate the inertia switch, the ECU
will signal to unlock central locking actuators and flash
hazard lights. Central locking will remain disabled for
30 seconds. To reset turn ignition off and then on after
the 30 second period has elapsed.
Ultrasonic unit
The unit operates by emitting an air pressure carrier
wave and receiving the wave back. Any disturbance
within the vehicle which disturbs the wave will be
detected, triggering the alarm.
When the volumetric sensor is activated it monitors
movement within the vehicle for 15 seconds before
detecting and responding to intrusions. If the sensor
detects movement within the vehicle it delays arming
until a 15 seconds quiet period has elapsed. If
continuous movement is detected the alarm will not
arm volumetrically.

86ELECTRICAL
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REPAIR FRONT DOOR ACTUATOR UNIT
Service repair no - 86.26.08
Remove
1.Ensure that the window glass is in its fully closed
position.
2.Disconnect battery negative lead.
3.Remove the door pull, trim panel and plastic
vapour barrier.
See CHASSIS AND BODY,
Repair, Front Door Trim Panel
4.Remove the lower two screws and plain washers
securing the actuator mounting plate to the inner
door panel.
NOTE: The upper two actuator mounting
plate securing screws also secure one of
the door pull mounting brackets and
locate with a nut retainer strip fitted on the inside
face of the inner door panel.
5.Remove the upper two screws, the door pull
mounting bracket and retrieve the nut retaining
strip from inside the door.
6.Release the window lift motor leads from the
three clips at the front of the door to allow
sufficient slack in the harness for actuator
assembly removal.
7.Detach actuator assembly operating rod from the
actuator link on the door lock.8.Withdraw the actuator assembly from the door
until the electrical cable is pulled out of its
channel sufficiently to expose the connector.
9.Detach the connector and remove the actuator
from the door.
10.The actuator unit may be changed by removing
the two rubber mounted screws that secure it to
the mounting plate.
Refit
11.Attach the actuator assembly connector to its
mating half on the door harness.
12.Engage the actuator assembly operating rod
with the hooked end of the actuator link.
13.Pull the door harness back into its channel from
the front end and secure the window lift motor
leads with the three clips.
14.Fit the actuator assembly to the inner door panel
and loosely secure with the two lower screws
and plain washers.
15.Position the nut retainer on the inside face of the
inner door panel, locate the door pull mounting
bracket and loosely secure with the two upper
screws.
16.Set the actuator mounting plate with the screws
in the centre of the slotted holes, then tighten the
screws sufficiently to retain the assembly.
17.Ensure that manual operation of the sill locking
control is not restricted by the operation of the
actuator operating rod and vice versa, resetting
the mounting plate as necessary.
18.Reconnect battery negative lead.
19.Check that electrical operation of the door lock
occurs when the sill locking control is moved
through half of its total movement. Reset the
mounting plate as necessary and fully tighten the
four screws.
NOTE: The above adjustment ensures that
the full tolerance on the switching
operation is utilised.

ELECTRICAL
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REPAIR EXTERIOR DRIVING MIRRORS
Service repair no - 76.11.10
Replacing the mirror glass
1.Press the outer end of the glass inwards to its
full extent.
2.Insert the fingers under the inner end of the
glass and pull outwards until the glass is
released from its two retaining clips.
3.Disconnect the two demister leads attached to
the back of the glass unit.
4.To replace the glass, locate the inner end of the
glass in the retaining clip of the housing first.
5.Carefully press the outer end of the glass
inwards until it securely locates in the front
retaining clip.
6.Reset the fine adjustment as required.Complete assembly
Service repair no - 76.11.10
Remove
1.Disconnect battery negative lead.
2.Carefully prise off interior finisher to reveal
retaining plate and securing screws.
3.Disconnect electrical plug.
4.Supporting the mirror assembly remove three
securing screws and retaining plate.
5.Detach mirror assembly from outer door frame.
Refit
6.Reverse removal procedure.
NOTE: To prevent damage to the electrical
lead ensure that it is not pushed down
inside the door casing.

ELECTRICAL
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REPAIR INSTRUMENT BINNACLE COMPONENTS
1. Instrument cowl
2. Face plate
3. Fuel gauge
4. Speedometer
5. Instrument binnacle
6. Screw - securing circuit board
7. Circuit board8. Tachometer
9. Temperature gauge
10. Illumination board
11. Screw securing illumination board
12. Circuit board - instrument illumination
13. Instrument illumination bulb holder and bulb
14. Speedometer trip reset button sleeve
15. Screw - cowl and binnacle

86ELECTRICAL
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REPAIR SPEEDOMETER
Service repair no - 88.30.01
Remove
1.Remove instrument cowl.
See Instrument
cowl and illumination board
2.Remove speedometer trip reset button sleeve.
3.Remove instrument face plate.
4.Remove 4 screws securing speedometer,
remove speedometer.
Refit
5.Reverse removal procedure.TACHOMETER
Service repair no - 88.30.21
Remove
1.Remove circuit board.
See Circuit board
2.Remove instrument cowl.See Instrument
cowl and illumination board
3.Remove speedometer trip reset button sleeve.
4.Remove instrument face plate.
5.Remove 3 screws securing tachometer to
binnacle, remove tachometer.
Refit
6.Reverse removal procedure.

ELECTRICAL
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REPAIR COOLANT TEMPERATURE AND FUEL GAUGES
Service repair no - 88.25.14 - Coolant temperature
gauge
Service repair no - 88.25.26 - Fuel gauge
Remove
1.Remove instrument cowl.
See Instrument
cowl and illumination board
2.Remove speedometer trip reset button sleeve.
3.Remove instrument face plate.
Coolant temperature gauge
4.Remove circuit board,See Circuit board
5.Remove 3 screws securing coolant temperature
gauge to binnacle, remove gauge.
Fuel gauge
6.Remove 3 screws securing fuel gauge to
binnacle, remove gauge.
Refit
7.Reverse removal procedure.SPEEDOMETER TRANSDUCER
Service repair no - 88.30.14
Remove
1.Position vehicle on ramp and chock wheels.
2.Raise ramp.
3.Disconnect multiplug from transducer.
4.Remove bolt securing transducer, remove
transducer.
Refit
5.Reverse removal procedure.

ELECTRICAL
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REPAIR COOLANT TEMPERATURE TRANSMITTER - V8i
Service repair no - 26.10.02
Remove
1.Disconnect battery negative lead.
2.Disconnect lead from transmitter.
3.Remove transmitter, discard sealing washer if
fitted.
Refit
4.Coat threads of replacement transmitter with
Loctite 572.
5.Fit a new sealing washer to transmitter.
6.Fit transmitter, connect lead.
7.Top-up cooling system.HEATED FRONT SCREEN
Heated front screen will operate when switch is
operated, with engine running. Timer unit will provide
a preset time cycle of 7« minutes±20%.
To identify timer unit.
See Electrical Trouble
Shooting Manual.Electrical Troubleshooting
Manual
Switching OFF ignition, or further operation of heated
front screen switch during cycle will switch off screen
and cancel, reset and switch off timer unit.