sensor LAND ROVER DISCOVERY 1995 Workshop Manual

76CHASSIS AND BODY
70
REPAIR
8.Remove the securing bolt and detach the inertia
reel from the bottom of the 'B' post.9.Release the seat belt sensor connector (if fitted).
10.Release Torx bolt to allow removal of the seat
belt stalk assembly.
Refit
11.Reverse removal procedure.
NOTE: Ensure the seat belt is not twisted.
12.Re-connect the seat belt sensor connector (if
fitted).
13.Finally, tighten the seat belt fixings to
32 Nm (24
lbf ft)
.

82AIR CONDITIONING
10
REPAIR 2.Disconnect 2 Lucar connectors from thermostat.
3.Position wiring aside.
4.Remove 2 screws securing heater pipe bracket
and position pipes aside.
5.Remove 10 clips retaining upper and lower
casings.
6.Remove 5 screws retaining upper casing.
7.Remove lower casing and evaporator.
8.Remove 4 clips securing evaporator top cover.
9.Remove evaporator top cover.
10.Remove thermostat sensor from evaporator
matrix.
11.Remove evaporator assembly from lower casing.
12.Remove bulkhead seal from case.
Expansion valve
13.Remove insulation from evaporator and
expansion valve connections.
14.Remove expansion valve sensor retaining clip.
15.Unscrew 2 pipe unions. Discard 'O' ring seals.
CAUTION: Use a second wrench to
support pipe adapters and plug
connections.
16.Remove expansion valve.
17.Unscrew pipe union. Discard 'O' ring seal.
18.Remove evaporator pipe.
Refit
19.Reverse removal procedure. Use new 'O' rings,
insulation and bulkhead seal.
NOTE: Use refrigerant oil on all 'O' rings
and mating surfaces. Tighten connection
See Specifications, torque, Torque Values
20.Wrap all exposed metal at hose connections with
prestite tape.
21.Evacuate and recharge system.
See
Adjustment, Refrigerant Recovery Recycling
Recharging
22.Leak test any disturbed joints.See Adjustment,
Leak Test System
23.Perform a functional check.
24.Disconnect service unit.

AIR CONDITIONING
11
REPAIR THERMOSTAT
Service repair no - 86.25.50
Remove
1.Remove heater and cooler unit.
See Heater
and Cooler Unit
2.Remove lower cover and evaporator.See
Evaporator and Expansion Valve
3.Remove 5 clips and screw securing evaporator
top cover.
4.Remove evaporator top cover.
5.Remove thermostat sensor from evaporator
matrix.
6.Remove 2 screws securing sensor unit.
7.Remove thermostat and insulation.
Refit
8.Reverse removal procedure.
CAUTION: The thermostat insulation must
be installed in the ORIGINAL POSITION in
the evaporator.EVAPORATOR/BLOWER MOTOR ASSEMBLY -
REAR
Service repair no - 82.26.01
Remove
1.Recover refrigerant from system.
See
Adjustment, refrigerant recovery recycling
recharging
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant. Plug all exposed
connections immediately.
2.Remove evaporator to alpine light duct.
See
evaporator to alpine light duct
3.Remove LH rear mud flap.See CHASSIS AND
BODY, Repair, mud flap - rear - lh
4.Clean area around low and high pressure air
conditioning pipe unions, beneath rear wheel
arch, to prevent any risk of dirt entering the
system.
5.Loosen and disconnect high and low pressure
air conditioning pipe unions beneath rear wheel
arch.
6.Remove and discard 'O' rings from pipe unions.
CAUTION: Use 2 spanners when loosening
or tightening air conditioning pipe unions.
CAUTION: Plug exposed connections
immediately.

86ELECTRICAL
2
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
6
DESCRIPTION AND OPERATION ALARM COMPONENT LOCATIONS (96 MODELS)
COMPONENT LOCATION
1. Electronic control unit (ECU) and relays Under dash (passenger side).................
2. Anti-theft alarm indicator light Instrument panel..................................
3. Engine immobilisation warning light (EIWL) * Instrument panel..........
4. Passive coil Over starter switch barrel.............................................................
5. Bonnet switch RH engine compartment..........................................................
6. Door switches
7. Ultrasonic sensor Interior light switch panel....................................................
8. Lock barrel, sill buttons
9. Handset and key
10. Battery backed-up sounder or horn * RH engine compartment......................
11. Immobilisation unit (spider) * Above heater...................................
12. Aerial Part of fascia harness.......................................................................
* where applicable

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
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.

86ELECTRICAL
44
REPAIR BONNET SWITCH
Service repair no - 86.55.89
Remove
1.Remove 2 bolts securing sounder, move
sounder aside.
2.Locate and disconnect bonnet switch multiplug.
3.Release and remove switch.
Refit
4.Reverse removal procedure.ULTRASONIC SENSOR
Service repair no - 86.77.32
Remove1.Release sensor from switch panel.
2.Disconnect multiplug and remove sensor.
Refit
3.Reverse removal procedure.
ANTI-THEFT ALARM INDICATOR LIGHT (96
MODELS)
Service repair no - 86.45.61
See Instrument illumination and warning light
bulbs
ENGINE IMMOBILISATION WARNING LIGHT (96
MODELS)
Service repair no - 86.45.61
See Instrument illumination and warning light
bulbs

86ELECTRICAL
46
REPAIR STARTER MOTOR - 4.0 V8
Service repair no - 86.60.01
Remove
1.Disconnect battery negative lead.
2.Raise vehicle on ramp.
3.Remove heated oxygen sensor from RH front
exhaust pipe.
See EMISSION CONTROL,
Repair, Heated Oxygen Sensor (HO2S) - 4.0
V8
4.Mark front propeller shaft and drive flanges for
assembly reference.
5.Remove 4 nuts and bolts securing propeller
shaft flange.
NOTE: Raise 1 front road wheel and rotate
propeller shaft to gain access to all
fixings.
6.Tie propeller shaft aside.
7.Position starter motor heat shield above motor.
See Starter Motor Heat Shield - 4.0 V8
8.Disconnect Lucar from solenoid.
9.Remove nut securing feed wires to starter
solenoid and disconnect from terminal.

86ELECTRICAL
48
REPAIR STARTER MOTOR HEAT SHIELD - 4.0 V8
Service repair no - 86.60.12
Remove
1.Disconnect battery negative lead.
2.Raise vehicle on ramp.
3.Remove heated oxygen sensor from RH exhaust
front pipe.
See EMISSION CONTROL, Repair,
Heated Oxygen Sensor (HO2S) - 4.0 V8
4.Remove bolt securing heat shield to RH engine
mounting bracket.
5.Release heat shield clip from starter solenoid.
6.Manoeuvre heat shield rearwards and around
starter motor.
Refit
7.Reverse removal procedure.BULB - FRONT FOG LAMP
Service repair no - 86.40.94
Remove
1.Remove front fog lamp.
See fog lamp - front
2.Remove 2 Torx screws securing fog lamp to
bracket and collect 2 spacers.
3.Release fog lamp adjustment ball joint from
bracket and remove lamp.
4.Release lamp lens from shroud.
5.Disconnect 2 Lucars from bulb.
6.Release bulb retaining clip.
7.Remove bulb from lens.