Land Rover Defender Electrical Library Elld970e Rover Manual

							DESCRIPTIONANDOPERATION
DEFENDER 97MY 4.11
When
theignition switchisturned tothe crank position (090-1), itprovides a
feed tothe starter relaycoil(C151-85) onawhite/red wire.Therelay isearthed
(C151-86) onablack wire.Feed fromfusible link2(C907-2) ofthe engine
compartment fuseboxcannow flowacross thestarter relay(C151-87 &
C151-30). Currentflowsfromthestarter relay(C151-30) tothe similarily
energised fuelpump relay(C298-87) onawhite/red wire.Thefuelpump relay
(C2298-30) thenprovides afeed tothe fuel pump (C115-2) onawhite/purple
wire. Thefuelpump isearthed (C115-3) onablack wire.
With theengine running, andtheignition switchturned backtoposition II
(C094-1), theoilpressure switchwillsense oilpressure. Thisopens theswitch
and de-energises thefuel pump relay.Feedtothe fuel pump isnow provided
solely bythe fuel pump relay.
Ignition
Withtheignition switchinposition II,afeed issupplied tothe ignition coil
(C156-1) andtheignition amplifier module(C633-3). Botharesupplied current
on white wiresandareconnected inparallel. Anearth pathisprovided bythe
ignition amplifier modulefixings.
When theignition switchisturned tothe crank position, powerflowsacross
the switch (C090-1) tothe starter relay(C151-85) onawhite/red wire.The
relay isearthed (C151-86) onablack wire.Thisflowofcurrent energizes the
relay coiland allows abattery feedtoflow across therelay (C151-87 &
C151-30) andonto thestarter motor(C179-1) onawhite/red wire.Thisfeed
energizes thestarter solenoid, andallows afeed from thealternator (C178-1)
on abrown wiretooperate thestarter motor.Anearth isprovided bythe starter
motor. 
						

							DESCRIPTIONANDOPERATION
4.12 DEFENDER97MY
HEATER
BLOWER
DESCRIPTION The heater isoperated bythree sliding controls attached tothe instrument
binnacle. Twoofthe controls regulate thetemperature andairflow distribution.
The third control operates thetwo speed heater blower. Theheater blower
operates withtheignition switchinposition I.
OPERATIONFeed fromthepositive batteryterminal isconnected tothe engine compartment
fuse box(C632-1) byabrown wire.Current passesthrough fusiblelink2.
Fusible link2(C907-2) isconnected tothe ignition switch(C028-1) byabrown
wire. With theignition switchinposition I,power flowsthrough theignition switch
(C099-1) tofuse 5(C580-9) ofthe passenger compartment fuseboxbya
white/orange wire.Fuse 5(C580-10) ofthe passenger compartment fuseboxis
connected tothe blower fanmotor (C846-3) byapurple/green wire.When the
blower control isin the offposition, theblower motorhasnoroute toearth and
does notrun.
Moving theblower control toposition I,connects theblower motor(C846-2) to
the blower switch(C058-2) onagreen/yellow wire.Power flowsthrough the
blower motorandresistor tothe blower switch(C058-2) andtoearth (C058-3)
on ablack wire.Theblower fanoperates atlow speed.
Moving theblower control toposition 2,connects theblower motor(C846-1)
directly tothe blower switch(C058-1) onagreen/slate wire,andtoearth
(C058-3) onablack wire.Theblower fannow operates athigh speed. 
						

							DESCRIPTIONANDOPERATION
DEFENDER 97MY 4.13
HEATED
REARWINDOW (HRW)
DESCRIPTION The heated rearwindow (HRW)isoperated byalatching switchmounted on
the dash panel. Whentheswitch isset tothe On position, theinstrument
panel warning lampwillilluminate toindicate theHRW isoperating. TheHRW
only operates whentheignition switchisturned toposition II.
OPERATIONFeed fromthepositive batteryterminal isconnected tothe engine compartment
fuse box(C632-1) byabrown wire.Current passesthrough fusiblelink2and
fusible link4ofthe engine compartment fusebox,which areconnected in
parallel. Fusiblelink2(C907-2) isconnected tothe ignition switch(C028-1) by
a brown wire.
With theignition switchinposition II(C094-1), currentflowstothe HRW
switch (C381-2) onawhite wire.Theswitch controls theHRW relaycoil.
When theswitch isdepressed, currentflowsfromtheswitch (C381-4) tothe
relay coil(C044-85) onawhite/green wire.Current flowsacross thecoil and is
earthed (C044-86) byablack wireviathe earth header joint(C287-2).
With therelay coilenergised, batteryfeedviafusible link4(C906-1) isable to
flow across theHRW relaymainterminals (C044-87 &C044-30). The
energised relaynowsupplies afeed tofuse 8ofthe passenger compartment
fuse box(C580-15) onabrown/white wire.
Fuse 8ofthe passenger compartment fusebox(C580-16) suppliescurrentto
the HRW element (C382-1) onabrown/white wire,andtheHRW warning lamp
(C929-1), alsoonawhite/brown wire.Thewarning lampandheater element
are connected inparallel. 
						

							DESCRIPTIONANDOPERATION
4.14 DEFENDER97MY
WIPERS
ANDWASHERS
DESCRIPTION The front windscreen wipersarecontrolled fromthecolumn switchandoperate
when theignition switchisin position II.The wipers have2speed settings,
along withaflick wipe andsingle wipefacility. Anintermittent wipefunction and
programmed washwipefacility iscontrolled bythe front wiper delay unit.
Moving thewiper switch downfromtheoffposition initiatestheintermittent
wipe function. Movingthewiper switch upone position fromtheoffposition,
operates thewipers atslow speed. Moving thewiper switch uptwo positions
from theoffposition, operates thewipers atfast speed. Pushing thewiper
switch upfrom theoffposition, notallowing itto latch, andthen releasing it
causes thewipers toperform asingle wipecycle atslow speed. Pushing and
holding thewiper switch upfrom theoffposition, notallowing itto latch, causes
the wipers tooperate atslow speed untilthewiper switch isreleased.
Pressing theend ofthe wiper switch, initiates theprogrammed washwipe
sequence. Thewindscreen washersoperatewhiletheswitch ispressed and
the wipers continue tooperate foranumber ofcycles aftertheswitch is
released. The rear screen wiperandwash facilities arecontrolled byaswitch mounted
on the dash panel. Pressing theswitch causes therear washer tooperate until
the switch isreleased. Therear wiper doesnotoperate automatically withthe
rear wiper. Turning theswitch clockwise causestherear wiper tooperate until
the switch isturned backtothe offposition. 
						

							DESCRIPTIONANDOPERATION
DEFENDER 97MY 4.15
OPERATION Feed
fromthepositive batteryterminal isconnected tothe engine compartment
fuse box(C632-1) byabrown wire.Current passesthrough fusiblelink2
(C907-2) whichisconnected tothe ignition switch(C028-1) byabrown wire.
With theignition switchinposition II,power flowsacross theswitch (C094-1)
to fuse 3(C580-5) andfuse 4(C580-7) ofthe passenger compartment fuse
box, which areconnected inparallel. Botharefedbywhite wires. Fuse3
supplies therear wash/wiper circuit,andfuse 4the front wash/wipe circuit.
FrontWipers andWashers
Fuse 4ofthe passenger compartment fusebox(C580-8) suppliesthefront
wiper delay unit(C303-8) a12 volt feed onagreen wirewhen theignition
switch isin position II.
SlowandFast Speeds
Fuse 4also provides afeed tothe wash/wipe switch(C278-6) onagreen wire.
Moving theswitch tothe slow speed position allowspowertoflow across the
switch (C278-1), tothe wiper motor (C030-3) onablue/light greenwire.This
feed intothewiper motor doesnotenergize allthe motor windings, therefore
the motor operates atslow speed. Thewiper motor isearthed (C030-1) ona
black wire.Moving thewiper switch tothe fast position allowspowertoflow
through theswitch (C278-5) tothe wiper motor (C030-5) onared/light green
wire. Thistime, allmotor windings areenergized andthemotor operates atfast
speed. Again,thewiper motor (C030-1) isearthed onablack wire.
Operating theflick wipe function outputsafeed from thewash/wipe switch
(C278-5), andonto thewiper motor (C030-5) foraslong asthe switch isheld
against springpressure. Thewipers operate atfast speed. 
						

							DESCRIPTIONANDOPERATION
4.16 DEFENDER97MY
Park Circuit
Positioning thewash/wipe switchtothe off position cutspower tothe wiper
motor onthe blue/light greenorred/light greenwire.Thepark circuit operates
to return thewipers totheir park position. Thepark switch (C030-4), integralto
the wiper motor unit,receives a12 volt supply fromfuse4ofthe passenger
compartment fusebox(C580-6) onagreen wire.Thepark switch isclosed with
the wipers inany position otherthantheirpark position.
With thepark switch closed, powerflowsacross theswitch (C030-2) tothe
front wiper delay unit(C303-5) onabrown/light greenwire.Thefront wiper
delay unit(C303-2) isconnected tothe wash/wipe switch(C278-4) bya
yellow/light greenwire.Power flowsthrough thewash/wipe switch(C278-1) to
the wiper motor (C030-3) onablue/light greenwire.Thewiper motor isearthed
on ablack wire.Thewipers operate untiltheir park position isreached andthe
park switch opens, cuttingpowersupply tothe wiper motor.
Intermittent WiperFunction
Moving thewiper switch tothe intermittent wipeposition allowspowertoflow
across theswitch (C278-3) tothe front wiper delay unit(C303-1) ona
white/green wire.Witha12 volt signal applied tothe delay unitfrom thewiper
switch, thedelay unitswitches theroute toearth (C303-4) onand off
approximately every5seconds onablack wire.
Programmed Wash/WipeFunction
Depressingtheend ofthe wiper switch operates theprogrammed wash/wipe
function. Thewasher switch(C278-6) issupplied fromfuse4ofthe passenger
compartment fusebox(C580-8) onagreen wire.When theswitch isclosed,
power flowsthrough theswitch (C278-2) tothe front wiper delay unit(C303-6)
on agreen/black wire,andtothe windscreen washerpump(C008-2) on
another green/black wire.Thewasher pumpisearthed (C008-1) onablack
wire. 
						

							DESCRIPTIONANDOPERATION
DEFENDER 97MY 4.17
When
thedelay unit(C303-6) receivesafeed from thewasher switch(C278-2),
it outputs afeed (C303-2) tothe wash/wipe switch(C278-4) onayellow/light
green wire.Power flowsoutthrough thewash/wipe switch(C278-1) andonto
the wiper motor (C030-3), whichoperates atslow speed. Whenthewasher
switch isreleased, thedelay unitwilloperate thewipers forafurther 3cycles.
Once thishas been completed, feedtothe wash/wipe switchiscut bythe delay
unit and thepark circuit isinitiated.
Rear Wiper
Therear wiper switch (C918-1) issupplied byfuse 3ofthe passenger
compartment fuseboxonagreen wire.When theswitch isin the on position
(C915-1), powerisfed tothe rear screen wipermotor (C388-2) onared/light
green wire.Thewiper motor (C388-1) isearthed onablack wire.
ParkCircuit
Positioning thewiper switch tothe off position cutspower tothe wiper motor
on the red/light greenwire.Thepark circuit operates toreturn thewiper toits
park position. Thepark switch (C079-2), integraltothe wiper motor unit,
receives a12 volt supply fromfuse3ofthe passenger compartment fusebox
(C580-6) onagreen wire.Thepark switch isclosed withthewiper inany
position exceptitspark position
With thepark switch closed, powerflowsacross thepark switch (C079-1) tothe
wiper switch (C916-1) onabrown/light greenwire.Power flowsthrough the
wiper switch (C915-1) tothe wiper motor (C388-2) onared/light greenwire.
The wiper motor isearthed (C388-1) onablack wire.
RearWash
Therear wash switch (C918-1) issupplied byfuse 3ofthe passenger
compartment fuseboxonagreen wire.When theswitch isclosed (C917-1),
power isfed tothe rear screen washer pump(C021-2) onablack/light green
wire. Thewasher pump(C021-1) isearthed onablack wire.Therear screen
wash doesnotoperate therear wiper. 
						

							DESCRIPTIONANDOPERATION
4.18 DEFENDER97MY
EXTERIOR
LAMPS-Brake andReverse Lamps
DESCRIPTION The brake lamps illuminate whentheignition isin position IIand thebrake
pedal isdepressed. Thereverse lampsilluminate whentheignition isin
position IIand reverse gearisselected.
OPERATIONFeed fromthepositive batteryterminal isconnected tothe engine compartment
fuse box(C632-1) byabrown wire.Current passesthrough fusiblelink2
(C907-2) andisconnected tothe ignition switch(C028-1) byabrown wire.
When theignition switchisin position II,power flowsacross theswitch
(C094-1) andisconnected tofuse 17ofthe passenger compartment fusebox
(C580-33) byawhite wire.Current flowsacross thefuse (C580-34) andfeeds
the brake pedalswitch (C075-1) andthereverse lampswitch (C167-2), which
are connected inparallel. Bothswitches arefedbygreen wires.
Brake Lamps
Whenthebrake pedalisdepressed, thebrake pedalswitch closes andpower
flows through theswitch. Thebrake pedalswitch (C029- 1)isconnected tothe
LH taillamp (C404-2), thetrailer pick-up (C416-1), andtheRH taillamp
(C401-2) bygreen/purple wires.Allbrake lamps areearthed onblack wires.
Reverse Lamps
Whenreverse gearisselected, thereverse lampswitch isclosed. Current
flows across thereverse lampswitch (C167-1) tothe RH reverse lamp
(C455-2), andtheLHreverse lamp(C490-1) ongreen/brown wires.Both
reverse lampsareearthed onblack wires. 
						

							DESCRIPTIONANDOPERATION
DEFENDER 97MY 4.19
EXTERIOR
LAMPS-Head, SideandNumber PlateLamps
DESCRIPTION The lights areoperated fromthelighting switchlocated onthe steering column.
The lighting switchhastwopositions. Position1switches onthe taillamps, the
number platelamps, andfront sidelamps. Position 2additionally switcheson
the front headlamps. Whentheheadlamps areon,thecolumn switchcanbe
used toswitch between mainbeam anddipped beam.
The headlamps canbeflashed withthelights onoroff, bypulling thecolumn
switch towards thedriver.
OPERATIONFeed fromthepositive batteryterminal isconnected tothe engine compartment
fuse box(C632-1) byabrown wire.Current passesthrough fusiblelink1and
fusible link2,which areconnected inparallel. Powerfromfusible link1(C907-
1) feeds thelighting switch(C041-1) onabrown wire.
SideLamps
Withthelighting switchinthe side lamps position, powerflowsthrough thelight
switch (C041-2) tofuse 16(C580-31) andfuse 15(C580-29) ofthe passenger
compartment fuseboxonred wires. Fuses 16and 15are connected inparallel,
fuse 16feeding theRH lamps, fuse15the LHlamps.
Fuse 16ofthe passenger compartment fusebox(C580-32) isconnected tothe
RH front sidelamp (C537-2) byared/orange wire.Thelamp isthen earthed
(C537-1) onablack wire.Fuse 16also feeds theRH trailer pick-up (C418-1)
on ared/orange wire.Thisisconnected inseries withtheRH taillamp
(C401-3). Thetaillamp isearthed (C401-1) onablack wire.Alsoconnected in
parallel withtheRH front sidelamp isthe side lamp instrument packwarning
lamp (C233-5), whichisfed byared/orange wire.Thewarning lampisearthed
(C233-2) byablack wire. 
						

							DESCRIPTIONANDOPERATION
4.20 DEFENDER97MY
Fuse
15ofthe passenger compartment fusebox(C580-30) isconnected tothe
LH front sidelamp (C538-2) byared/black wire.Thelamp isthen earthed
(C538-1) onablack wire.Connected inparallel withtheLHfront sidelamp is
the LHtrailer pick-up (C877-1), whichisalso fedbyared/black wire.Thetrailer
pick-up (C877-2) isconnected inseries tothe LHtaillamp (C404-3) bya
red/black wire.Thetaillamp isearthed (C404-1) onablack wire.
Headlamps
Withthelighting switchinthe main beam position, powerflowsthrough the
switch (C041-4) tothe headlamp relay(C282-87) onablue wire. Therelay coil
(C282-85) isenergized whentheignition switchisin position II,and is
earthed (C282-86) onablack wire.
Dipped beam
Whentherelay coilisenergized, itallows current toflow across therelay
(C282-30) tothe column switch(C036-1) onablue wire. Thecolumn switch
(C036-6) isconnected tothe dim diprelay (C048-8) byablue/red wire.Asthe
dim diprelay isnot energized, currentisallowed toflow from therelay (C048-2)
to fuses 11and 12ofthe passenger compartment fusebox.Both fuses arefed
by blue/red wires,andareconnected inparallel. Fuse11feeds theRH
headlamp, fuse12the LHheadlamp.
Fuse 11ofthe passenger compartment fusebox(C580-22) isconnected tothe
RH headlamp (C011-2)byablue/black wire.Thisilluminates theheadlamp
dipped beamandisearthed (C011-3) onablack wire.
Fuse 12ofthe passenger compartment fusebox(C580-24) isconnected tothe
LH headlamp (C009-2)byablue/black wire.Thisilluminates theheadlamp
dipped beamandisearthed (C009-3) onablack wire.