relay LAND ROVER DEFENDER 1999 Owner's Guide

84WIPERS AND WASHERS
4
DESCRIPTION AND OPERATION REAR WIPER - FROM 02MY
1.Rear wiper relay
The rear wiper system is unchanged except for the addition of a wiper motor relay into the electrical circuit.
The new rear wiper relay is located in the tail door, below the wiper motor. The relay coil is energised by a feed
supplied from the rear wiper switch. When the relay contacts close, a feed is supplied via the ignition switch
(position II) and a fuse in the passenger compartment fuse box, through the relay contacts to the wiper motor.
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WIPERS AND WASHERS
5
REPAIR
9.Remove cable ties securing washer tube to
windscreen wiper rack tube.
10.Loosen fully 4 nuts securing backplates to wheel
boxes and remove windscreen wiper rack tubes.
11.Remove seals from wheel box spindles.
12.Remove 2 nuts securing wheel boxes and
remove sealing washers.
13.Carefully pull fascia support rail from bulkhead
sufficiently to remove wheel boxes.
Refit
14.Loosen fully but do not remove nuts securing
wheel box back plates.
15.Grease wheel boxes.
16.Fit wheel boxes, fit sealing washers and tighten
nuts to5 Nm (3.7 lbf.ft).
17.Fit spindle seals.
18.Fit wiper rack tubes and tighten wheel box back
plate nuts sufficiently to hold tubes. Tighten
wheel box back plate nuts to6 Nm (4 lbf.ft)
after fitting windscreen wiper motor.
19.Align washer tube to rack tube and secure with
cable ties.
20.Align fascia support rail and secure with screws.
21.Fit steering column support bracket and tighten
bolt and nut and bolt to45 Nm (33 lbf.ft).
22.Fit demister duct to tube, align relay bracket and
secure duct with screws.
23.Position heater fan switch and secure with
screws.
24.Fit wiper motor and drive rack.See this
Section.
25.Fit steering column nacelle.See STEERING,
Repair.
26.Connect battery negative lead.See
ELECTRICAL, Repair.RELAY - WIPER DELAY - FROM 02MY
Service repair no - 84.15.37
Remove
1.Disconnect battery negative lead.See
ELECTRICAL, Repair.
2.Remove 4 screws securing instrument pack and
release pack from fascia.
3.Disconnect 2 multiplugs from warning lamp
panel.
4.Disconnect instrument pack multiplug from main
harness.
5.Remove instrument pack.
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84WIPERS AND WASHERS
6
REPAIR
6.Identify and remove relay.
Refit
7.Fit relay.
8.Position instrument pack and connect multiplugs.
9.Fit instrument pack to fascia and secure with
screws.
10.Connect battery negative lead.See
ELECTRICAL, Repair.MOTOR - WIPER - TAIL DOOR - FROM 02MY
Service repair no - 84.35.12
Remove
1.Remove spare wheel from tail door.
2.Raise nut cover, remove nut and release wiper
arm.
3.Remove nut and collect washer securing wiper
motor to tail door.
4.Open tail door.
5.Remove tail door trim casing.See CHASSIS
AND BODY, Repair.
6.Remove bolt securing door locking solenoid to
tail door.
7.Pivot both assemblies and withdraw wiper motor
from tail door.
8.Disconnect multiplugs from wiper motor.
9.Remove wiper motor assembly.
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WIPERS AND WASHERS
7
REPAIR
NOTE: Do not carry out further
dismantling if component is removed for
access only.
10.Remove 2 bolts securing wiper motor to
mounting bracket, remove bracket.
Refit
11.Fit mounting bracket to motor and tighten bolts
to10 Nm (7 lbf.ft).
12.Fit motor spindle to rear door, connect multiplugs
and push motor fully home. Align motor
mounting bracket with solenoid mounting
bracket, fit bolt and tighten to10 Nm ( 7 lbf.ft ).
13.Fit rear door trim casing.See CHASSIS AND
BODY, Repair.
14.Fit washer and nut to rear wiper assembly,
tighten nut to3 Nm (2.2 lbf.ft).
15.Fit wiper arm to spindle, align blade to glass and
tighten nut to17 Nm (13 lbf.ft).
16.Close nut cover.
17.Fit spare wheel and tighten nuts to45 Nm (33
lbf.ft).RELAY - TAIL DOOR WIPER - FROM 02MY
Service repair no - 84.35.38
Remove
1.Remove tail door trim casing.See CHASSIS
AND BODY, Repair.
2.Remove rear wiper motor relay.
Refit
3.Fit relay.
4.Fit tail door trim casing.See CHASSIS AND
BODY, Repair.
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86 - ELECTRICAL
CONTENTS
Page
LAMP ASSEMBLY - CENTRE HIGH MOUNTED STOP LIGHT (CHMSL) -
FROM 02MY 16......................................................................................................
FLASHER UNIT - HAZARD WARNING - FROM 02MY 16.....................................
RELAY - HEATED FRONT SCREEN - FROM 02MY 17........................................
RELAY - REAR FOG GUARD - FROM 02MY 18...................................................
RELAY - STARTER - FROM 02MY 19...................................................................
SWITCH - HEADLAMP LEVELLING - FROM 02MY 19.........................................
CIGAR LIGHTER - FRONT - FROM 02MY 20........................................................
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ELECTRICAL
7
DESCRIPTION AND OPERATION Alarm Sounders
1.Battery Backed Up Sounder (BBUS)
2.Alarm sounder
Two types of alarm sounder are available, dependant on the vehicle market configuration.
A Battery Backed-Up Sounder (BBUS) is used in some markets and located in the LH front wing, behind the
headlamp. This is a tamper proof sounder with its own power supply which allows it to continue operating even if
disconnected from the vehicle power supply. The BBUS is connected to a permanent battery supply via fuse 7 in
the under seat fuse box. Two further connections are made to the anti-theft alarm ECU and a fourth connection is
to an earth header. If the BBUS is disconnected without first being disarmed by the anti-theft alarm ECU, it will
operate for 4.5 minutes.
To disarm the BBUS, when the battery is to be disconnected for instance, the ignition must be turned on to
position II and back to the off position , after which a 17 second delay is initiated to allow the battery or BBUS
connector to be disconnected. If the BBUS sounds, it can be disarmed by unlocking the vehicle with the remote
handset.
Where a BBUS is not specified, a standard vehicle horn is used for the alarm sounder and is located in the LH
front wing, behind the headlamp. The sounder is operated by an alarm relay which is controlled by the anti-theft
alarm ECU. The relay receives a permanent battery supply via fusible link 6 in the under seat fuse box. The relay
coil is connected to the anti-theft alarm ECU which provides an earth for the coil when horn operation is required.
This operates the relay contacts and supplies battery voltage to the sounder, causing it to operate.
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86ELECTRICAL
12
DESCRIPTION AND OPERATION IMMOBILISATION SYSTEM - FROM 02MY
Engine immobilisation is available on all 2002MY engine derivatives, although it is not available in selected
markets. On Td5 models, the immobilisation system is controlled directly by the anti-theft alarm ECU. On 300Tdi
models, the immobilisation system is controlled by an engine immobilisation ECU in conjunction with the anti-theft
alarm ECU.
When immobilisation occurs on Td5 models, engine crank is disabled by the anti-theft alarm ECU breaking the
earth path for the starter relay coil and the ECM disables the fuel pump relay and the glow plug relay.
When immobilisation occurs on 300Tdi models, engine crank is disabled by the anti-theft alarm ECU breaking the
earth path for the starter relay coil and the engine immobilisation ECU disables the fuel cut-off solenoid, the starter
motor solenoid and the glow plug relay.
Two types of immobilisation are available; passive and active.
Engine Immobilised Warning Lamp
The engine immobilised warning lamp is located in the instrument pack. The lamp is used by the anti-theft alarm
ECU to show that the engine is immobilised during an attempted engine start.
The warning lamp receives a battery supply from the ignition switch position I (aux) via the passenger
compartment fusebox. The anti-theft alarm ECU controls the warning lamp. When the warning lamp is not
required, the ECU supplies a battery supply to the warning lamp. When warning lamp operation is required, the
ECU provides an earth for the bulb.
If the ignition switch is moved to the crank position, but operation of the starter motor is prohibited and the engine
immobilised warning lamp flashes, then the anti-theft alarm ECU has not received the correct code from the
remote handset and the vehicle will remain immobilised. Ensure that the remote handset is in the proximity of the
transponder coil. If the remote handset is not available or inoperative, the immobilisation system can be disarmed
using the EKA procedure outlined later in this section.
If the ignition switch is turned to the crank position III and the remote handset is not in the proximity of the
transponder coil, engine immobilisation will remain active and the warning lamp will flash to inform the driver.
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86ELECTRICAL
20
DESCRIPTION AND OPERATION HEATED FRONT SCREEN - FROM 02MY
1.Heated front screen RH connector
2.Heated front screen LH connector
3.Heated front screen ECU (behind instrument pack)
4.Heated front screen relay (passenger compartment fuse box)
5.Heated front screen switch
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ELECTRICAL
21
DESCRIPTION AND OPERATION The Heated Front Screen (HFS) is a new feature for 2002MY which is available as part of a cold climate pack on
Td5 engine variants only. The HFS system comprises an HFS ECU, an HFS relay, a controlling switch and the
HFS elements.
The HFS comprises two elements laminated in the windscreen. The elements are connected by bus bars within
the screen and therefore the HFS has only one feed and one earth connector.
The HFS is controlled by the HFS ECU which determines when HFS operation is permitted. The ECU also has a
timer which allows HFS operation for up to 8 minutes. The HFS ECU is located behind the instrument pack,
adjacent to the dim/dip relay. The ECU is connected by a multiplug. The ECU receives an ignition feed via the
satellite fuse box and an engine running signal from the engine oil pressure switch.
A non-latching switch for HFS operation is located in the fascia. The switch has a tell-tale lamp to indicate when
the HFS screen is operative.
The HFS relay is located in the under seat fuse box and receives a permanent battery voltage supply via fusible
link 1 in the under seat fuse box. The relay coil is connected to the HFS ECU and an earth point. When the relay is
operated, battery voltage is supplied from the relay, via fuse 25 in the passenger compartment fuse box to the
HFS element.
When the HFS switch is depressed, a momentary earth path is completed from the HFS ECU, through the switch
to earth. This is sensed by the ECU as a request for HFS operation. If the ECU receives an ignition on signal and
an oil pressure signal, it allows HFS operation. The ECU provides an output to the coil of the HFS relay. When the
coil is energised, the contacts close and battery voltage, via fusible link 1 in the under seat fuse box is supplied to
the HFS element, via fuse 25 in the passenger compartment fuse box. The feed is also supplied via a splice joint
to the HFS switch to illuminate the tell tale lamp in the switch.
The HFS ECU will allow screen operation for up to 8 minutes, after which it removes the feed to the HFS relay
coil, which, after the contacts open, removes the supply to the HFS element and simultaneously extinguishing the
tell tale lamp in the switch. If, during the timed operation period, the HFS ECU receives an additional request
signal from operation of the switch, HFS operation is stopped.
When operating, the HFS element draws approximately 25 Amps. To prevent excess drain on the vehicle battery,
if the ignition on signal and/or the oil pressure switch (engine running) signal is lost, the HFS ECU de-energises, if
already operating, or will not energise the HFS relay.
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86ELECTRICAL
22
DESCRIPTION AND OPERATION HEATED FRONT SEATS - FROM 02MY
1.LH and RH seat heater switches
2.Seat heater cushion and squab elements
3.Seat heat/Window lift relay (passenger compartment fuse box)
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