ECU LAND ROVER DISCOVERY 1995 Workshop Manual

82AIR CONDITIONING
26
REPAIR ALPINE LIGHT DUCT
Service repair no - 82.26.21
Remove
1.Remove evaporator to alpine light duct.
See
evaporator to alpine light duct
2.Remove rear door upper trim panel.See
CHASSIS AND BODY, Repair, rear door
upper trim panel - with rear air conditioning
fitted
3.Remove clip securing alpine light duct to body
flange.
4.Remove screw securing alpine light duct.
5.Manoeuvre alpine light duct from headlining and
'D' post finishers and remove duct.
Refit
6.Position alpine duct and manoeuvre into
position.
7.Fit and tighten screw securing alpine duct to
body.
8.Fit clip securing alpine duct to body flange.
9.Fit rear door upper trim panel.
See CHASSIS
AND BODY, Repair, rear door upper trim
panel - with rear air conditioning fitted; Refit
10.Fit evaporator to alpine light duct.See
evaporator to alpine light duct; Refit
EVAPORATOR TO ALPINE LIGHT DUCT
Service repair no - 82.26.22
Remove
1.Remove rear compartment lower trim panel.
See CHASSIS AND BODY, Repair, rear
compartment lower trim panel - lh - with rear
air conditioning fitted
2.Remove 4 clips securing duct to evaporator.
3.Release duct from evaporator.
4.Remove duct from alpine light.
Refit
5.Fit duct to alpine light.
6.Position duct to evaporator ensuring rear of duct
flange is positioned beneath body panel flange.
7.Fit clips securing duct to evaporator.
8.Fit rear compartment lower trim panel.
See
CHASSIS AND BODY, Repair, rear
compartment lower trim panel - lh - with rear
air conditioning fitted; Refit

AIR CONDITIONING
27
REPAIR BLOWER MOTOR RESISTOR - REAR
Service repair no - 82.26.23
Remove
1.Remove evaporator/blower motor assembly.
See evaporator/blower motor assembly -
rear
2.Disconnect multiplug from resistor.
3.Remove 2 screws securing resistor to blower
motor casing.
4.Remove resistor.
Refit
5.Fit resistor to blower motor casing and secure
with screws.
6.Connect multiplug to resistor.
7.Fit evaporator/blower motor assembly.
See
evaporator/blower motor assembly - rear;
Refit

WIPERS AND WASHERS
1
REPAIR WASHER RESERVOIR
Service repair no - 84.10.03.
Remove
1.Remove two bolts securing top of reservoir.
2.From underneath the wheelarch remove two
bolts securing base of reservoir.
3.Withdraw reservoir and disconnect tubing from
washer pumps and power wash.
4.Disconnect electrical leads from pumps.
Refit
5.Reverse removal procedure. 1 to 4.WASHER PUMP - WINDSCREEN, REAR WINDOW
OR POWER WASH
Service repair no - 84.20.21.
Remove
1.Remove washer reservoir.See Washer
reservoir
2.Disconnect washer tubing from pump.
3.Disconnect electrical leads from pump.
4.Pull top of pump away from its location in
reservoir and remove pump.
Note position of sealing gasket in reservoir.
Refit
5.Reverse removal procedure. 1 to 4.

84WIPERS AND WASHERS
2
REPAIR WINDSCREEN WASHER JETS
Service repair no - 84.10.09.
Remove
1.Disconnect washer tube from jet.
2.Remove nut and washer securing washer jet to
air intake cowl.
3.Remove jet.
Refit
4.Reverse removal procedure. 1 to 3.WINDSCREEN WASHER TUBES
Service repair no - 84.10.15.
Remove
1.Disconnect tubing from reservoir pump.
2.Disconnect tubing from washer jets.
3.Disconnect tubing from three-way tee piece.
4.Release tubing from retaining clip and withdraw.
Refit
5.Reverse removal procedure. 1 to 4. Ensuring the
tubing is not pinched or restricted.

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.