alarm LAND ROVER DISCOVERY 1995 Service Repair Manual

TRANSFER GEARBOX
1
DESCRIPTION AND OPERATION LT230T TRANSFER BOX
The LT230T transfer box is a permanent 4 wheel
drive, two speed ratio reducing gearbox incorporating
high and low range outputs with mechanically lockable
centre differential (diff-lock). High/low range and
diff-lock selection are made via a single lever located
forward of the main gear lever.
A shiftlock device is fitted in some territories, it is used
as a park facility and prevents accidental gear
disengagement when the ignition is switched off. An
audible neutral alarm is also fitted. This alerts the
driver when parking to move the gear lever to the high
or low position.

41TRANSFER GEARBOX
4
REPAIR SHIFTLOCK SOLENOID/NEUTRAL SWITCH
Service repair no - 41.10.63/64
This is sited on top of the transfer gearbox. Access to
the component is gained through the transmission
tunnel aperture.
Remove
1.Disconnect battery negative lead.
2.Remove centre console.
See CHASSIS AND
BODY, Repair, Centre Console
3.Remove rear passenger heater air ducts.
4.Remove insulation pad.
5.Remove four screws and remove main gear
lever assembly.
6.Drill out rivets and remove tunnel blanking plate.
7.Disconnect solenoid multiplug.
8.Remove four retaining bolts and remove shiftlock
solenoid cover.
9.Remove solenoid and spring washer.
10.Clean joint sealant from mating faces.
KEY
1. Gearlever
2. Transmission tunnel aperture
3. Transfer gearbox
4. Bolt
5. Switch
6. Solenoid
7. Electrical connectionsRefit
1.Apply Hylosil or equivalent sealant to mating
faces.
2.Ensure solenoid plug lead is located in cover
recess.
3.Reverse removal procedure.
4.Fit four solenoid bolts. Tighten to
9Nm.
Neutral switch, audible alarm
1.Disconnect neutral switch electrical plug.
2.Remove neutral switch from transfer box.
Refit
3.Apply Hylomar PL32/L20 or SL500 sealant to
neutral switch.
4.Reverse removal procedure.
5.Switch - Tighten to
25Nm.

70BRAKES
22
REPAIR MODULATOR UNIT
Service repair no - 70.65.45
WARNING: New modulator units are
supplied in a shock absorbing pack
marked with a use by date. The new
modulator will contain hydraulic brake fluid within
the valve block and all ports plugged.
Modulator units must be handled with care the
following must be avoided:- any impact, use of
compressed air on any of the hydraulic ports,
removing plugs to connection ports before fitting
unit.
Remove
1.Refer to the illustration of brake components
ABS. For details of modulator unit and hydraulic
pipe connections to it.
See Brake
Components ABS
2.Refer to general brake service practice.See
General Brake Service Practice
3.Check new modulator unit is packaged in
accordance with the WARNING above.
4.Disconnect battery negative lead.
5.Remove the two electrical plugs.
6.Identify 8 pipe to modulator connections for
correct reassembly.
7.Disconnect 8 pipe unions.
8.Remove nuts securing modulator to mounting
bracket.
9.Remove modulator unit.
10.Remove mounting bushes and cup.
Refit
11.Fit mounting bushes and cup to new modulator.
12.Fit modulator unit to mounting bracket.
13.Fit 8 pipes to modulator connections. Pipes
mustbe connected to correct port. Tighten to
15Nm.
14.Bleed the complete hydraulic system.See
Brake System Bleed
15.Check system function using the 'Testbook'
diagnostics
16.Test operation of brakes.ELECTRONIC CONTROL UNIT ABS
Service repair no - 70.65.01
Remove
For location of the ECU.
See Description and
operation, ABS Components
1.Disconnect battery negative lead.
2.Remove retaining bolt and lower alarm system
ECU and relay mounting bracket into passenger
footwell.
3.Remove two screws and detach ECU complete
with harness plug from mounting bracket.
4.Release ECU plug retaining clip.
5.Move plug in direction of arrow and release
hooked end of plug from retaining post.
Refit
6.Reconnect ECU harness plug ensuring that it is
firmly located and retaining clip secures plug.
7.Reverse removal procedure.

CHASSIS AND BODY
39
REPAIR SUNROOF ELECTRIC MOTORS
Service repair no - 76.82.84/85
FRONT MOTOR
Remove
1.Disconnect battery negative lead.
2.Ensure sunroof is in normally closed position
NOTE: If the electric motor has failed the
sunroof can be closed manually using an
allen key to turn motor spindle A.
3.Remove switch panel from stowage pocket
panel
4.Remove interior lamp from stowage pocket
panel
5.Remove alarm ultrasonic unit.
6.Unscrew ten fixings and remove stowage pocket
from headlining.
7.Disconnect motor wiring multiplug.
8.Remove three screws and motor.
Refit
9.Reverse removal procedure.
CAUTION: Ensure the motor is aligned
with fixing holes and the sunroof is in the
normally closed position. DO NOT rotate
the motor drive spindle in the rack - this may
result in incorrect operation of the sunroof.REAR MOTOR
Remove
1.Disconnect battery negative lead.
2.Ensure sunroof is in normally closed position
NOTE: If the electric motor has failed the
sunroof can be closed manually using an
allen key to turn motor spindle.
3.Remove headlining.
See headlining.
4.Disconnect motor wiring multiplug.
5.Remove three screws and motor.
Refit
6.Reverse removal procedure.
CAUTION: Ensure the motor is aligned
with fixing holes and the sunroof is in the
normally closed position. DO NOT rotate
the motor drive spindle in the rack - this may
result in incorrect operation of the sunroof.

76CHASSIS AND BODY
40
REPAIR SUNROOF ELECTRIC CONTROL UNIT
Service repair no - 76.82.73
The control unit serves both front and rear sunroofs
and is sited above the front switches behind
headlining.
Remove
1.Disconnect battery negative lead.
2.Ensure sunroof is in normally closed position.
NOTE: If the electric motor has failed the
sunroof can be closed manually using an
allen key to turn motor spindle.
3.Remove switch panel from stowage pocket
panel
4.Remove interior lamp from stowage pocket
panel
5.Remove alarm ultrasonic unit.
6.Unscrew ten fixings and remove stowage pocket
from headlining.
7.Disconnect electric plugs from control unit.
8.Remove two retaining screws and control unit.
Refit
9.Reverse removal procedure.

76CHASSIS AND BODY
42
REPAIR SUNROOF REGULATOR MANUAL
Service repair no - 76.83.03/04
FRONT
Remove
1.Ensure sunroof is in normally closed position.
2.Remove retaining screw and regulator handle.
3.Remove switch panel from stowage pocket
panel
4.Remove interior lamp from stowage pocket
panel
5.Remove alarm ultra sonic unit.
6.Unscrew ten fixings and remove stowage pocket
from headlining.
7.Remove two retaining screws and regulator from
clamping frame.
Refit
8.Reverse removal procedure.
CAUTION: Ensure the regulator is aligned
with fixing holes and the sunroof is in the
normally closed position. DO NOT rotate
the regulator spindle in the rack - this may result
in incorrect operation of the sunroof.REAR
Remove
1.Ensure sunroof is in normally closed position.
2.Remove retaining screw and regulator handle.
3.Remove headlining.
See headlining.
4.Remove two retaining screws and regulator from
clamping frame.
Refit
5.Reverse removal procedure.
CAUTION: Ensure the regulator is aligned
with fixing holes and the sunroof is in the
normally closed position. DO NOT rotate
the regulator spindle in the rack - this may result
in incorrect operation of the sunroof.

76CHASSIS AND BODY
68
REPAIR Dismantle
4.Remove interior lamp lens.
5.Remove 2 nuts securing lamp to stowage panel.
6.Remove lamp.
7.Remove alarm volumetric sensor/blanking plate.
8.Remove electric sun roof switch pack.
9.Remove electric sun roof manual opening plug.
Rebuild
10.Fit electric sun roof manual opening plug to
panel.
11.Fit alarm volumetric sensor.
12.Fit electric sun roof switch pack to panel.
13.Fit interior lamp to panel and secure with nuts.
14.Fit interior lamp lens.
Refit
15.Position stowage panel assembly and connect
Lucar and multiplugs.
16.Align panel to headlining and secure with
screws.REAR FOLD DOWN SEAT BELTS - LH WITH REAR
AIR CONDITIONING FITTED
Service repair no - 76.73.28/20
Remove
1.Locate the seat in the down position, remove the
seat belt strap and buckle from their stowed
positions.
2.Remove seat belt strap and buckle retaining bolt
covers.
3.Remove bolts securing strap and buckle.
4.Remove seat belts and collect spacers.
Refit
5.Fit spacers to seat belt retaining bolts, position to
fixings and tighten to
32 Nm (24 lbf ft).
6.Fit seat belt retaining bolt covers.
7.Secure seat belt strap and buckle to their stowed
positions and position seat in the up position.

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.

ELECTRICAL
3
DESCRIPTION AND OPERATION Radio frequency system
The RF system uses four frequencies according to
market. If the coaxial aerial is not fitted system
performance will be impaired. Both ECU and handset
have a colour coded label.
Frequency Colour Territory
ECU/Handset
433.92 MHz Blue/black........................... UK, Ireland........................
224.5 MHz, Yellow/yellow............................ France...................
433.92 MHz Blue/Purple........................... Germany......................
433.92 MHz Blue/blue........................... Europe, not France, Switzerland, Italy, Denmark,..........................
Germany
433.92 MHz White/Blue........................... Switzerland, Denmark.......................
315.0 MHz Green/green............................. Rest of world, Italy, Australia....................
315.0 MHz Orange/Green............................. Gulf, Japan..................
Partially armed mode
If a door, tailgate or bonnet [hood] is left open when
the system is armed, the LED will not light for 10
seconds indicating a mislock condition. Hazard lights
will not flash. If an open door or tailgate is causing the
mislock, the starter motor is disabled. The alarm will
sound if ignition is turned to start position. If an open
bonnet [hood] is causing the mislock the starter motor
is disabled. The alarm will arm the volumetric part of
the system. If the door tailgate or bonnet [hood] is
subsequently closed, after a 5 second delay, the
doors will unlock and immediately lock and the system
will fully arm.
Handset transmitter
The handset LED will give one short flash when
button is pressed momentarily.
If button is held down the LED will light again after 2
seconds for 2 seconds, and extinguish until button is
released and repressed. The handset contains unique
information distinguishing it from other transmitters. It
also contains a set of 'random' rolling codes
programmed into the ECU before leaving the factory.
Each time the handset is pressed a different code is
transmitted to the ECU.
If handset is operated more than four times outside
the vehicle range (6 metres) or power supply is
removed, it will be necessary to re-sychronise handset
and the ECU by pressing the handset three times
within range and within 5 seconds.
NOTE: If both handsets are lost or
damaged when system is armed it will be
necessary to fit a new ECU with two
matching handsets.
Handset batteries
If handset LED flashes continuously when button is
pressed, the batteries need replacing. The hazard
lights will flash one 3 second pulse, instead of three
times upon arming vehicle.
Power up mode
The alarm system always remembers the state it was
left in when power was removed. If the alarm powers
up in an armed state and is subsequently triggered it
will give a warning that it will fully trigger unless
disarmed. This warning consists of short horn pulses
every two seconds for 15 seconds.
New born mode
When the ECU is first produced, it will be in its 'new
born' mode. In this mode it will respond to any remote
of the right frequency. This mode will be cancelled
when the ECU has received ten valid handset signals
without power interruption.
Engine cranking
It is only possible to crank the engine when ignition is
ON and alarm disabled.

86ELECTRICAL
4
DESCRIPTION AND OPERATION BUILT IN TEST PROCEDURE
The built in test procedure is accessed as follows:
1.Starting conditions: ignition off, doors unlocked,
bonnet [hood] switch depressed.
2.Carry out instructions 3 to 7 within 8 seconds.
3.Release bonnet [hood] switch.
4.Switch ignition ON.
5.Lock doors.
6.Switch ignition OFF.
7.Switch ignition ON.
If alarm is correctly accessed, horn will sound and
LED will flash. The following checks can be made:
8.Open and close any door or tailgate - LED will
light.
9.Depress bonnet [hood] switch - hazards will
flash.
10.Check engine cranking is disabled. Do not turn
off ignition.
11.Check ultrasonic by operating handset, LED will
emit one 5 second flash, and will flash if interior
is disturbed.
NOTE: If ECU is new born mode any
handset of the right frequency will work. If
not an initialised handset is required see
Handset Initialisation.
12.Turn OFF ignition or press handset to end test
procedure. Horn will sound as before to indicate
end of test mode.