wiring LAND ROVER DISCOVERY 1995 Owner's Manual

80HEATING AND VENTILATION
2
REPAIR 8.Disconnect 4 multiplugs and position harness
aside.
NOTE:Do not carry out further
dismantling if component is removed for
access only.
9. Fan speed switch:remove fan speed switch
slide and push out fan speed switch.
10.Pull out light bulb disconnect terminals and
remove fan speed light strip.
11.Unclip 3 heater control cables from control unit.
12. Microswitch:Unclip 3 micro switches.
13.Cut cable tie and release wiring harness from
control unit.
14.Remove heater control unit.
Refit
15.Reverse removal procedure. Check the
satisfactory function of the controls before fitting
louvre vent panel.CONTROL CABLES
Service repair no - 80.10.06 - Air flow
Service repair no - 80.10.25 - Temperature control
RH
Service repair no - 80.10.26 - Temperature control
LH
Remove
1.Release fascia centre louvre vent panel from its
fitted position to gain access to rear of panel.
See CHASSIS AND BODY, Repair, Dash
Panel Central Louvre Panel
2.Open glove box, manoeuvre side springs
through cut-outs and lower lid.

80HEATING AND VENTILATION
6
REPAIR BLOWER MOTOR UNIT - HEATER AND AIR
CONDITIONING
Service repair no - 80.20.17
Service repair no - 82.25.54.
Remove
1.Move seats to rear most position.
2.Disconnect battery negative lead.
3.Remove fascia panel assembly.
See CHASSIS
AND BODY, Repair, Dash Panel Assembly
4.Remove 2 nuts securing lower brackets to
toeboard.
5.Manoeuvre blower unit from heater unit and
remove.
Refit
6.Reverse removal procedure. Ensure seal
between blower and heater unit is tight.BLOWER MOTOR
Service repair no - 80.20.17
Service repair no - 82.25.33.
Remove
1.Remove blower motor unit.
See Blower Motor
Unit - Heater and Air Conditioning
2.Release wiring harness retaining clip.
3.Remove 3 screws securing casing.
4.Remove blower motor assembly.

AIR CONDITIONING
3
FAULT DIAGNOSIS FAULT CAUSE REMEDY
1. Overcharge of refrigerant. 1. Discharge, evacuate and charge
system.
A.
HIGH HEAD2. Air in system. 2. Discharge system, fit new drier,
PRESSUREevacuate and charge system.
3. Condenser air passage clogged 3. Clean condenser of debris.
with dirt or other foreign matter.
4. Condenser fan motor defective. 4. Replace motor.
5. Incorrect voltage to fan motor. 5. Check voltage.
1. Undercharge of refrigerant; 1. Evacuate and charge system.
B.evident by bubbles in sight Check for leakage.
LOW HEADglass while system is operating
PRESSURE2. Split compressor gasket or 2. Replace gasket and/or reed
leaking valves. valve. Fit new drier, evacuate and
charge system.
3. Defective compressor. 3. Repair or replace compressor.
1. Loose drive belt 1. Check belt tension.
2. Refrigerant flooding through
evaporator into suction line; evident
by ice on suction line and suction
service valve.2. Check thermobulb. Bulb should be
securely clamped to clean horizontal
section of copper suction pipe.
C.3. Expansion valve stuck open. 3. Replace expansion valve.
HIGH4. Leaking compressor valves, 4. Replace valves and/or
SUCTIONvalve gaskets and/or service gaskets. Fit new drier
PRESSUREvalves. evacuate and charge system.
5. Receiver/drier blocked; evident 5. Fit new drier, evacuate
by temperature difference and charge system.
between input and output lines.
1. Expansion valve thermobulb not 1. Warm thermobulb with hand.
operating. Suction should rise rapidly to 1.4 bar
20 lb/in
2or more. If not replace
expansion valve.
2. Expansion valve sticking closed. 2. Check inlet side screen.
D.Clean if clogged. Refer
LOWto C-2 and C-3.
SUCTION3. Moisture freezing in expansion valve
orifice. Valve outlet tube will frost
while inlet hose tube will have little or
no frost. System operates
periodically.3. Fit new drier, evacuate and charge
system.
4. Dust, paper scraps, or other debris
restricting evaporator blower grille4. Clean grilles as required.
5. Defective evaporator blower motor,
wiring, or blower switch.5. Refer to Fault Diagnosis Chart for
blower motor.

AIR CONDITIONING
7
REPAIR
12.Disconnect receiver/drier pipes at condenser
unions.
13.Remove retaining bracket from side pipe.
14.Remove LH pipe from condenser and discard 'O'
ring.
15.Remove 2 screws securing receiver/drier
bracket.
16.Release pipes from lower clips and remove
receiver/drier assembly.
17.Remove 'O' ring from RH pipe
18.Remove 2 screws securing lower end of each
fan motor.
19.Remove 2 bolts and remove condenser lower
mounting bracket.
20.Remove 2 bolts and securing condenser upper
mounting bracket.
21.Remove upper mounting bracket and fan motor
assembly.
22.Remove 2 screws securing each side mounting
bracket and remove the brackets.
23.Transfer parts removed to new condenser.
24.Add 40 ml of refrigerant oil to new compressor to
compensate for oil loss.
Refit
25.Reverse removal procedure. 3 to 11.
26.Evacuate and recharge air conditioning system.
See Adjustment, Refrigerant Recovery
Recycling Recharging
27.Carry out leak test on disturbed joints.See
Adjustment, Leak Test System
28.Check air conditioning operation by carrying out
a System Test.
See Adjustment, System Test
CONDENSER FANS AND MOTORS
Service repair no - 82.15.01 - Motor
Service repair no - 82.15.03 - Fan
Remove
1.Remove condenser assembly.
See Condenser
2.Remove 4 bolts securing fan cowl to condenser.
3.Remove 3 bolts securing fan motor to cowl.
4.Remove fan motor assembly.
5.Remove 3 screws securing fan blades to motor.
6.Remove fan blades.
Refit
7.Reverse removal procedure. Ensuring that wiring
is clipped and no fouling of fan blade can occur.

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.

WIPERS AND WASHERS
1
FAULT DIAGNOSIS WIPER MOTOR CHECKING
NOTE: These instructions apply to
windscreen and rear window wiper motor.
If unsatisfactory operation of wiping equipment is
experienced, a systematic check to determine fault
should be carried out:
1.Check blades for signs of excessive friction. This
reduces wiping speed of motor and cause
increased current draw which may damage
armature. Check by substitution.
2.Check windscreen wiper motor light running
current and speed with motor coupling link
disconnected from wiper shaft transmission
linkage.
Check rear window glass wiper motor with wiper
connected and glass wet. Connect an ammeter in
series with motor supply. Measure current
consumption when motor is switched on. Check
operating speed by timing speed of rotation of motor
coupling link. The results should compare with figures
given in 'General Specification Data'.
NOTE: If vehicle wiring connections are
disconnected and an alternative supply
source is applied it is essential that
correct polarity is observed. Failure to observe
this will cause motor to rotate in reverse direction,
which may result in limit switch contacts being
damaged.
3.If motor does not run satisfactorily or takes
higher than normal current, a fault exists and
must be remedied.
4.If current consumption and speed of motor are
satisfactory. A check should be carried out for
proper functioning of transmission linkage and
wiper arm shafts.
NOTE: Service parts are not available for
windscreen and rear window wiper motors
with exception of windscreen wiper rotary
connecting link.

86ELECTRICAL
2
FAULT DIAGNOSIS LUCAS CONSTANT ENERGY IGNITION SYSTEM -
V8i
Preliminary checks
Inspect battery cables and connections to ensure they
are clean and tight. Check electrical condition of
battery.
Inspect all L.T. connections, ensure they are clean
and tight. Check H.T. leads are correctly positioned
and not shorting to ground against any engine
components. Wiring harness and individual cables
should be firmly fastened to prevent chaffing.
Pick-up air gap
Check air gap between pick-up limb and reluctor teeth
is 0.20 - 0.35 mm, using a non-ferrous gauge.
NOTE: Air gap is set initially at factory and
will only require adjusting if tampered with
or when pick-up module is replaced.
TEST 1:
H.T. Sparking
Remove coil/distributor H.T. lead from distributor
cover and hold approximately 6mm from engine block,
using suitable insulated pliers. Switch ignition 'On' and
operate starter.
Regular sparking indicates fault in H.T. distribution,
plugs, timing or fuelling, proceed to Test 6. If no spark
or weak spark occurs proceed to Test 2.TEST 2:
L.T. Voltage
Switch ignition 'On' - engine stationary.
(a) Connect voltmeter to points in circuit indicated
by V1 to V4 and make a note of voltage
readings.
(b) Compare voltages obtained with specified
values listed below:
Expected readings
V1 More than 12 volts.
V2 1 volt maximum below volts at V1.
V3 1 volt maximum below volts at V1.
V4 0 volt - 0.1 volt.
(c) If all readings are correct proceed to Test 3.
(d) Check incorrect reading(s) with chart to identify
area of possible faults, i.e. faults listed under
heading SUSPECT and rectify.
(e) If coil and amplifier is suspected, disconnect L.T.
lead at coil, repeat V3. If voltage is still incorrect,
fit new coil. If voltage is now correct, check L.T.
lead, if satisfactory fit new amplifier.
(f) If engine will not start proceed to Test 3.

ELECTRICAL
3
FAULT DIAGNOSIS 1 2 3 4 SUSPECT
L * * * DISCHARGED BATTERY
* L L * IGN. SWITCH AND/OR
WIRING
* * L * COIL OR AMPLIFIER
* * * H AMPLIFIER GROUND
Key
*Expected Voltage
HVoltage higher than expected
LVoltage lower than expectedTEST 3:
Amplifier Switching
Connect voltmeter between battery positive (+ve)
terminal and H.T. coil negative (-ve) terminal.
Voltmeter should register 0 volts.
Switch ignition 'On', voltmeter should still register 0
volts.
Crank engine, voltmeter reading should increase
when cranking, in which case proceed to Test 5.
If no increase in voltage during cranking proceed to
Test 4.

ELECTRICAL
9
REPAIR
7.Disconnect wiring solenoid to multiplug.
8.Remove circlip and retainer plate.
9.Remove clip and centre sleeve.
10.Refit clip into groove on spindle and lever
against it to remove solenoid from housing.
Refit
11.Fit solenoid with wiring positioned into side cover
recess.
12.Fit sleeve and new clip.
13.Fit retaining plate and circlip.
14.Connect wiring to multiplug.
15.Apply sealant and fit side cover to housing. Use
Silcoset 152 sealant or equivalent.
16.Grease all moving parts of gear selector
mechanism. Use Rocol E1A or equivalent
grease.
17.Reverse removal procedure. 1 to 5.Interlock microswitch onto castellated plate.
Remove
1.Disconnect battery negative lead.
2.Remove gear selector head and illumination
panel
See CHASSIS AND BODY, Repair,
Centre console
3.Disconnect electrical multiplug.
4.Remove screws and lift gear selector
mechanism above housing.
5.Remove screws from microswitch support
bracket.
6.Remove screws and separate side cover from
housing.
7.Disconnect wiring microswitch to multiplug.

86ELECTRICAL
10
REPAIR
8.Remove 3 clips as shown.
9.Slide trunnion forward and remove gear selector
arm.
10.Remove bolts securing coxcomb.
11.Remove microswitch retaining clip and
microswitch.Refit
12.Reverse removal procedure, correctly
positioning microswitch.
13.Apply Loctite 242E to castellated plate bolts.
Tighten to
9Nm.
14.Grease all moving parts of gear selector
mechanism. Use Rocol E1A or equivalent
grease.
15.Apply Silcoset 152 sealant or equivalent and fit
side cover to housing.
Interlock microswitch onto side cover
Remove
1.Disconnect battery negative lead.
2.Remove gear selector head and illumination
panel
See CHASSIS AND BODY, Repair,
Centre console
3.Disconnect electrical multiplug.
4.Remove screws from microswitch support
bracket.
5.Disconnect wiring microswitch to multiplug.
Refit
6.Reverse removal procedure. Correctly
positioning microswitch.
7.Grease all moving parts of gear selector
mechanism. Use Rocol E1A or equivalent
grease.