lock LAND ROVER DISCOVERY 1995 Workshop Manual

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.

86ELECTRICAL
4
FAULT DIAGNOSIS TEST 4:
Pick-up Coil Resistance
Remove amplifier.
Connect ohmmeter leads to two pick-up terminals in
body of distributor.
The ohmmeter should register between 2k and 5k
ohm if pick-up is satisfactory. If ohmmeter reading is
correct, check all connections between pick-up and
amplifier, if satisfactory, fit new amplifier. If engine still
does not start carry out Test 5.
Change pick-up if ohmmeter reading is incorrect. If
engine still does not start proceed to Test 5.TEST 5:
Coil H.T. Sparking
Remove existing coil/distributor H.T. lead and fit test
H.T. lead to coil tower. Using suitable insulated pliers,
hold free end about 6mm from engine block and crank
engine. There should be good H.T. sparking.
If weak or no sparking, fit new coil, repeat test.
H.T. sparking good, repeat test with original H.T. lead.
If sparking is good carry out Test 6.
If weak or no sparking, fit new H.T. lead, if engine will
not start carry out Test 6.

ELECTRICAL
1
REPAIR FUSE BOX - INTERIOR
Right Hand Drive shown
The interior fusebox is fitted below the steering column, behind the trim panel. It comprises of three integral units.
'A'Main fusebox,'B'Satellite 2,'C'Satellite 1.
A label in the fusebox cover shows the circuits protected, the fuse rating and their locations. Access is by
releasing the fixing screws and lowering the panel.
'A' Main fusebox
1. Stop lights, direction indicators
2. LH side light
3. Radio/cassette/CD player
4. RH headlight main beam
5. LH headlight main beam
6. Cigar lighter
7. Airbag SRS
8. RH side lights
9. Rear fog guard lights
10. RH headlight dipped beam
11. LH headlight dipped beam
12. Multi-function unit
13. Ignition feed for Multi-function unit
14. Instruments, reversing lights
15. Air conditioning, windows
16. Washers & wipers - front
17. Starter, glow plug
18. Wash/wipe - rear, mirrors, cruise control
'B' Satellite 2
1. Electric windows - front
2. Electric windows - rear
3. Anti-lock braking
4. Central door locking
5. Electric sun roof
6. Trailer lights
'C' Satellite 1
1. Anti-theft alarm
2. Headlight washers
3. Engine management
4. Anti-lock brakes
5. Anti-theft alarm
6. Rear air conditioning, heater
'D' Spare fuses (5 off)

86ELECTRICAL
2
REPAIR FUSE BOX - ENGINE COMPARTMENT
The fusebox is located on the right side of the engine compartment. The circuits protected and their locations are
shown on the inside of the fusebox cover. To change a main circuit fuse prise off protective cover A and remove
retaining screws.
Fuses
1. Heated rear window
2. Sidelights
3. Air conditioning
4. Hazard warning lights, horn
5. ABS valve
6. Fuel pump
7. Fuel injectors
A Main circuit fuses
8. ABS pump
9. Ignition circuits
10. Lighting
11. Window lift, central door locking, rear blower
12. Heater, air conditioning
13. Generator

86ELECTRICAL
6
REPAIR Refit
NOTE: If a new distributor is being fitted,
mark body in same relative position as
distributor removed.
8.Leads for distributor cap should be connected as
illustrated.
Figures 1 to 8 inclusive indicate plug lead
numbers.
RH-Right hand side of engine, when viewed
from rear.
LH-Left hand side of engine, when viewed from
rear.
9.If engine has not been turned while distributor
has been removed, carry out instructions 10. to
17. Alternatively proceed to instruction 18.
10.Fit new 'O' ring seal to distributor housing.
11.Turn distributor drive until centre line of rotor arm
is 30Ê anti-clockwise from mark made on top
edge of distributor body.
12.Fit distributor in accordance with alignment
markings.
NOTE: It may be necessary to align oil
pump drive shaft to enable distributor
drive shaft to engage in slot.
13.Fit clamp and bolt. Secure distributor in exact
original position.
14.Connect vacuum hose to distributor and low
tension lead to coil.
15.Fit distributor cap.
16.Reconnect battery.
17.Using suitable electronic equipment, set ignition
timing.
See Adjustment, Ignition timing
18.If engine has been turned with distributor
removed, carry out instructions 19 to 30.
19.Set engine-No. 1 piston to static ignition timing
figure
See ENGINE TUNING DATA,
Information, Engine 3.9 V8i
20.Turn distributor drive until rotor arm is
approximately 30Ê anti-clockwise from number
one sparking plug lead position on cap.
21.Fit distributor to engine.
22.Check that centre line of rotor arm is now in line
with number one sparking plug lead on cap.
Reposition distributor if necessary.
23.If distributor does not seat correctly in front
cover, oil pump drive is not engaged. Engage by
lightly pressing down distributor while turning
engine.
24.Fit clamp and bolt, do not tighten.
25.Set ignition timing statically to 6Ê B.T.D.C.
26.Connect vacuum hose to distributor.
27.Fit low tension lead to coil.
28.Fit distributor cap.
29.Reconnect battery.
30.Using suitable electronic equipment set the
ignition timing.
See Adjustment, Ignition
timing

86ELECTRICAL
8
REPAIR PARK BRAKE WARNING SWITCH
Service repair no - 86.65.45
Remove
1.Disconnect battery negative lead.
2.Remove four screws and move aside window lift
switch panel.
3.Remove two screws, manoeuvre switch from
park brake and disconnect electrical lead.
Refit
4.Reverse removal procedure.GEAR SELECTOR-INTERLOCK
Interlock solenoid
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.

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.

ELECTRICAL
11
REPAIR HANDSET INITIALISATION
NOTE: New handsets are supplied in pairs.
If a new handset is required, it will require
initialisation to the ECU using the
following procedure:
1.Starting conditions: ignition off, doors unlocked,
bonnet switch depressed.
2.Carry out instructions 3. to 9. within 8 seconds.
3.Switch ignition ON.
4.Switch ignition OFF.
5.Lock doors.
6.Unlock doors.
7.Release bonnet switch.
8.Switch ignition ON.
9.Switch ignition OFF.
If alarm is correctly accessed, horn will sound and
LED will light. It is now possible to programme two
handsets of correct frequency to vehicle alarm ECU.
This must be carried out within two minutes.
10.Press and hold down button on first handset until
dash LED flashes.
11.Repeat instruction 10. for second handset.
12.The LED will extinguish if both handsets have
been initialised correctly.CENTRAL DOOR LOCKING
Where electrically operated central door locking is
fitted, locking or unlocking the drivers door from
outside by key operation, or from the inside with the
sill knob automatically locks or unlocks the passenger
and rear doors.
Front and rear passenger doors can be independently
locked or unlocked from inside the vehicle by sill knob
operation but can be overidden by further operation of
the driver's door locking control.
On rear doors, where side facing fold down seats are
fitted, a child safety lock is provided which can be
mechanically pre-set to render the interior door
handles inoperative.
Failure of a door actuator will not affect the operation
of the remaining doors and the door with the
inoperative actuator can still be locked or unlocked
manually.
The actuator unit fitted to the driver's door is the
master actuator and is identified from the actuators
fitted to the passenger and rear doors by having a
white connecting link, whereas the passenger and
rear door actuators have grey coloured connecting
links.
NOTE: Actuator units are non-servicable, if
a fault should occur replace the unit with a
new one.

86ELECTRICAL
12
REPAIR FRONT DOOR ACTUATOR UNIT
Service repair no - 86.26.08
Remove
1.Ensure that the window glass is in its fully closed
position.
2.Disconnect battery negative lead.
3.Remove the door pull, trim panel and plastic
vapour barrier.
See CHASSIS AND BODY,
Repair, Front Door Trim Panel
4.Remove the lower two screws and plain washers
securing the actuator mounting plate to the inner
door panel.
NOTE: The upper two actuator mounting
plate securing screws also secure one of
the door pull mounting brackets and
locate with a nut retainer strip fitted on the inside
face of the inner door panel.
5.Remove the upper two screws, the door pull
mounting bracket and retrieve the nut retaining
strip from inside the door.
6.Release the window lift motor leads from the
three clips at the front of the door to allow
sufficient slack in the harness for actuator
assembly removal.
7.Detach actuator assembly operating rod from the
actuator link on the door lock.8.Withdraw the actuator assembly from the door
until the electrical cable is pulled out of its
channel sufficiently to expose the connector.
9.Detach the connector and remove the actuator
from the door.
10.The actuator unit may be changed by removing
the two rubber mounted screws that secure it to
the mounting plate.
Refit
11.Attach the actuator assembly connector to its
mating half on the door harness.
12.Engage the actuator assembly operating rod
with the hooked end of the actuator link.
13.Pull the door harness back into its channel from
the front end and secure the window lift motor
leads with the three clips.
14.Fit the actuator assembly to the inner door panel
and loosely secure with the two lower screws
and plain washers.
15.Position the nut retainer on the inside face of the
inner door panel, locate the door pull mounting
bracket and loosely secure with the two upper
screws.
16.Set the actuator mounting plate with the screws
in the centre of the slotted holes, then tighten the
screws sufficiently to retain the assembly.
17.Ensure that manual operation of the sill locking
control is not restricted by the operation of the
actuator operating rod and vice versa, resetting
the mounting plate as necessary.
18.Reconnect battery negative lead.
19.Check that electrical operation of the door lock
occurs when the sill locking control is moved
through half of its total movement. Reset the
mounting plate as necessary and fully tighten the
four screws.
NOTE: The above adjustment ensures that
the full tolerance on the switching
operation is utilised.