1995 LAND ROVER DISCOVERY ECU

WIPERS AND WASHERS
3
REPAIR WIPER ARMS - WINDSCREEN
Service repair no - 85.15.01.
Remove
1.Lift wiper arm end cap to gain access to securing
nut.
2.Remove nut and withdraw wiper arm from
splined boss.
Refit
3.Allow wiper motor to move to 'park' position.
4.Push arm onto splined boss, locating it so that
wiper blades are clear of windscreen rail.
5.Fit and tighten securing nut.
6.Push end cap over securing nut.
7.Operate wiper on a wet windscreen to ensure
blades do not over travel.WIPER ARM - REAR WINDOW
Service repair no - 84.35.01.
Remove
1.Remove plastic nut cover and wiper arm
securing nut.
2.Withdraw wiper arm and grommet from splined
boss.
Refit
3.Allow wiper motor to move to 'park' position.
4.Fit spacer and wiper arm to splined boss so that
the wiper blade is clear of rear window surround.
5.Fit and tighten securing nut.
6.Push plastic nut cover into position.
7.Check operation of wiper.

WIPERS AND WASHERS
5
REPAIR WINDSCREEN WIPER MOTOR AND LINKAGE
Service repair no - 84.15.12.
Remove
1.Disconnect battery negative lead.
2.Remove windscreen wiper arms.
See Wiper
arms - Windscreen
3.Remove securing nuts and steel and rubber
washer from wiper spindles.
4.Open the bonnet [hood].
5.Remove rubber seal from cowl flange.
6.Disconnect tubing from windscreen washer jets.
7.Remove centre bolt from cowl.
8.Remove retainers securing centre section of
cowl to outer sections.
9.Detach centre section of cowl.
10.Remove nut and bolt securing wiper motor
negative lead to body.
11.Remove five screws securing wiper
motor/linkage support plate.
12.Lift assembly clear of bulkhead, disconnect
wiper motor multi-plug and withdraw assembly.
13.Remove wiper motor spindle nut and release
rotary connecting link from spindle.
14.Remove wiper motor retaining bolts and
withdraw negative lead and wiper motor from
support plate.
15.The linkage arms can be detached by removing
the retaining clips and withdrawing the arms and
washers.
Note location of plain and wavy washers for
reassembly purposes.

84WIPERS AND WASHERS
6
REPAIR Refit
16.Reverse removal procedure.
17.Fit wiper motor to support plate using new
sealing bushes at the motor spindle as
necessary.
18.When positioning assembled motor and support
plate use a new seal and bushes, if necessary.
REAR DOOR WIPER MOTOR
Service repair no - 84.35.12.
Remove
1.Disconnect battery negative lead.
2.Remove rear door trim panel.
3.Remove spare wheel.
4.Remove wiper arm and grommet.
5.Remove nut, plain washer and seal from drive
spindle.
6.From inside the door, disconnect wiper motor
leads from door harness at multi-plug.
7.Remove bolts securing wiper motor mounting
bracket and negative lead to inner door panel.
8.Withdraw motor spindle from outer door panel
and manoeuvre wiper motor from door casing
complete with the spindle spacer.
9.Remove two rubber mounted nuts securing
mounting bracket to motor and detach bracket.
Refit
10.Reverse removal procedure. 1 to 9.
NOTE: If a new wiper motor assembly has
been fitted, before fitting the wiper arm.
Reconnect battery negative lead. Operate
wiper motor to ensure that motor spindle is in
park position.

WIPERS AND WASHERS
7
REPAIR HEADLAMP POWER WASH JET
Service repair no - 84.20.08
Remove
1.Disconnect hose from power wash jet.
2.Remove nut securing jet to bumper.
3.Remove power wash jet.
Refit
4.Reverse removal procedure. 1 to 3.POWER WASH HOSE
Service repair no - 84.20.14
Remove
1.Disconnect power wash hoses from jets and
washer pump.
2.Release clamps securing hose.
3.Remove power wash hose.
Refit
4.Reverse removal procedure. 1 to 3, locating
hose in original 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.

ELECTRICAL
5
DESCRIPTION AND OPERATION ANTI THEFT ALARM SYSTEM
The main function of the system is to offer easy to use
remote locking and unlocking of the vehicle without
having to actively select the alarm function.
ALARM COMPONENTS
COMPONENT LOCATION
1. Electronic control unit (ECU) and relays Passenger footwell.................
2. Bonnet switch RH engine bay..........................................................
3. Door switches
4. Alarm sounder RH engine bay.........................................................
5. Light emitting diode (LED) Dash panel.......................................
6. Ultrasonic unit Roof map pocket.........................................................
7. Lock barrel, sill buttons
8. Handset transmitter
9. Aerial 'A' post, passenger side........................................................................