Land Rover Defender 300 Tdi Electrical Library Rover Manual

							DESCRIPTION AND OPERATION
DEFENDER 97 MY4.11
When the ignition switch is turned to the crank position (090-1), it provides a
feed to the starter relay coil (C151-85) on a white/red wire. The relay is earthed
(C151-86) on a black wire. Feed from fusible link 2 (C907-2) of the engine
compartment fuse box can now flow across the starter relay (C151-87 &
C151-30). Current flows from the starter relay (C151-30) to the similarily
energised fuel pump relay (C298-87) on a white/red wire. The fuel pump relay
(C2298-30) then provides a feed to the fuel pump (C115-2) on a white/purple
wire. The fuel pump is earthed (C115-3) on a black wire.
With the engine running, and the ignition switch turned back to position II
(C094-1), the oil pressure switch will sense oil pressure. This opens the switch
and de-energises the fuel pump relay. Feed to the fuel pump is now provided
solely by the fuel pump relay.
Ignition
With the ignition switch in position II, a feed is supplied to the ignition coil
(C156-1) and the ignition amplifier module (C633-3). Both are supplied current
on white wires and are connected in parallel. An earth path is provided by the
ignition amplifier module fixings.
When the ignition switch is turned to the crank position, power flows across
the switch (C090-1) to the starter relay (C151-85) on a white/red wire. The
relay is earthed (C151-86) on a black wire. This flow of current energizes the
relay coil and allows a battery feed to flow across the relay (C151-87 &
C151-30) and onto the starter motor (C179-1) on a white/red wire. This feed
energizes the starter solenoid, and allows a feed from the alternator (C178-1)
on a brown wire to operate the starter motor. An earth is provided by the starter
motor. 
						

							DESCRIPTION AND OPERATION
4.12
DEFENDER 97 MY
HEATER BLOWER
DESCRIPTION
The heater is operated by three sliding controls attached to the instrument
binnacle. Two of the controls regulate the temperature and air flow distribution.
The third control operates the two speed heater blower. The heater blower
operates with the ignition switch in position I.
OPERATION
Feed from the positive battery terminal is connected to the engine compartment
fuse box (C632-1) by a brown wire. Current passes through fusible link 2.
Fusible link 2 (C907-2) is connected to the ignition switch (C028-1) by a brown
wire.
With the ignition switch in position I, power flows through the ignition switch
(C099-1) to fuse 5 (C580-9) of the passenger compartment fuse box by a
white/orange wire. Fuse 5 (C580-10) of the passenger compartment fuse box is
connected to the blower fan motor (C846-3) by a purple/green wire. When the
blower control is in the off position, the blower motor has no route to earth and
does not run.
Moving the blower control to position I, connects the blower motor (C846-2) to
the blower switch (C058-2) on a green/yellow wire. Power flows through the
blower motor and resistor to the blower switch (C058-2) and to earth (C058-3)
on a black wire. The blower fan operates at low speed.
Moving the blower control to position 2, connects the blower motor (C846-1)
directly to the blower switch (C058-1) on a green/slate wire, and to earth
(C058-3) on a black wire. The blower fan now operates at high speed. 
						

							DESCRIPTION AND OPERATION
DEFENDER 97 MY4.13
HEATED REAR WINDOW (HRW)
DESCRIPTION
The heated rear window (HRW) is operated by a latching switch mounted on
the dash panel. When the switch is set to the On position, the instrument
panel warning lamp will illuminate to indicate the HRW is operating. The HRW
only operates when the ignition switch is turned to position II.
OPERATION
Feed from the positive battery terminal is connected to the engine compartment
fuse box (C632-1) by a brown wire. Current passes through fusible link 2 and
fusible link 4 of the engine compartment fuse box, which are connected in
parallel. Fusible link 2 (C907-2) is connected to the ignition switch (C028-1) by
a brown wire.
With the ignition switch in position II (C094-1), current flows to the HRW
switch (C381-2) on a white wire. The switch controls the HRW relay coil.
When the switch is depressed, current flows from the switch (C381-4) to the
relay coil (C044-85) on a white/green wire. Current flows across the coil and is
earthed (C044-86) by a black wire via the earth header joint(C287-2).
With the relay coil energised, battery feed via fusible link 4 (C906-1) is able to
flow across the HRW relay main terminals (C044-87 & C044-30). The
energised relay now supplies a feed to fuse 8 of the passenger compartment
fuse box (C580-15) on a brown/white wire.
Fuse 8 of the passenger compartment fuse box (C580-16) supplies current to
the HRW element (C382-1) on a brown/white wire, and the HRW warning lamp
(C929-1), also on a white/brown wire. The warning lamp and heater element
are connected in parallel. 
						

							DESCRIPTION AND OPERATION
4.14
DEFENDER 97 MY
WIPERS AND WASHERS
DESCRIPTION
The front windscreen wipers are controlled from the column switch and operate
when the ignition switch is in position II. The wipers have 2 speed settings,
along with a flick wipe and single wipe facility. An intermittent wipe function and
programmed wash wipe facility is controlled by the front wiper delay unit.
Moving the wiper switch down from the off position initiates the intermittent
wipe function. Moving the wiper switch up one position from the off position,
operates the wipers at slow speed. Moving the wiper switch up two positions
from the off position, operates the wipers at fast speed. Pushing the wiper
switch up from the off position, not allowing it to latch, and then releasing it
causes the wipers to perform a single wipe cycle at slow speed. Pushing and
holding the wiper switch up from the off position, not allowing it to latch, causes
the wipers to operate at slow speed until the wiper switch is released.
Pressing the end of the wiper switch, initiates the programmed wash wipe
sequence. The windscreen washers operate while the switch is pressed and
the wipers continue to operate for a number of cycles after the switch is
released.
The rear screen wiper and wash facilities are controlled by a switch mounted
on the dash panel. Pressing the switch causes the rear washer to operate until
the switch is released. The rear wiper does not operate automatically with the
rear wiper. Turning the switch clockwise causes the rear wiper to operate until
the switch is turned back to the off position. 
						

							DESCRIPTION AND OPERATION
DEFENDER 97 MY4.15
OPERATION
Feed from the positive battery terminal is connected to the engine compartment
fuse box (C632-1) by a brown wire. Current passes through fusible link 2
(C907-2) which is connected to the ignition switch (C028-1) by a brown wire.
With the ignition switch in position II, power flows across the switch (C094-1)
to fuse 3 (C580-5) and fuse 4 (C580-7) of the passenger compartment fuse
box, which are connected in parallel. Both are fed by white wires. Fuse 3
supplies the rear wash/wiper circuit, and fuse 4 the front wash/wipe circuit.
Front Wipers and Washers
Fuse 4 of the passenger compartment fuse box (C580-8) supplies the front
wiper delay unit (C303-8) a 12 volt feed on a green wire when the ignition
switch is in position II.
Slow and Fast Speeds
Fuse 4 also provides a feed to the wash/wipe switch (C278-6) on a green wire.
Moving the switch to the slow speed position allows power to flow across the
switch (C278-1), to the wiper motor (C030-3) on a blue/light green wire. This
feed into the wiper motor does not energize all the motor windings, therefore
the motor operates at slow speed. The wiper motor is earthed (C030-1) on a
black wire. Moving the wiper switch to the fast position allows power to flow
through the switch (C278-5) to the wiper motor (C030-5) on a red/light green
wire. This time, all motor windings are energized and the motor operates at fast
speed. Again, the wiper motor (C030-1) is earthed on a black wire.
Operating the flick wipe function outputs a feed from the wash/wipe switch
(C278-5), and onto the wiper motor (C030-5) for as long as the switch is held
against spring pressure. The wipers operate at fast speed. 
						

							DESCRIPTION AND OPERATION
4.16
DEFENDER 97 MY
Park Circuit
Positioning the wash/wipe switch to the off position cuts power to the wiper
motor on the blue/light green or red/light green wire. The park circuit operates
to return the wipers to their park position. The park switch (C030-4), integral to
the wiper motor unit, receives a 12 volt supply from fuse 4 of the passenger
compartment fuse box (C580-6) on a green wire. The park switch is closed with
the wipers in any position other than their park position.
With the park switch closed, power flows across the switch (C030-2) to the
front wiper delay unit (C303-5) on a brown/light green wire. The front wiper
delay unit (C303-2) is connected to the wash/wipe switch (C278-4) by a
yellow/light green wire. Power flows through the wash/wipe switch (C278-1) to
the wiper motor (C030-3) on a blue/light green wire. The wiper motor is earthed
on a black wire. The wipers operate until their park position is reached and the
park switch opens, cutting power supply to the wiper motor.
Intermittent Wiper Function
Moving the wiper switch to the intermittent wipe position allows power to flow
across the switch (C278-3) to the front wiper delay unit (C303-1) on a
white/green wire. With a 12 volt signal applied to the delay unit from the wiper
switch, the delay unit switches the route to earth (C303-4) on and off
approximately every 5 seconds on a black wire.
Programmed Wash/Wipe Function
Depressing the end of the wiper switch operates the programmed wash/wipe
function. The washer switch (C278-6) is supplied from fuse 4 of the passenger
compartment fuse box (C580-8) on a green wire. When the switch is closed,
power flows through the switch (C278-2) to the front wiper delay unit (C303-6)
on a green/black wire, and to the windscreen washer pump (C008-2) on
another green/black wire. The washer pump is earthed (C008-1) on a black
wire. 
						

							DESCRIPTION AND OPERATION
DEFENDER 97 MY4.17
When the delay unit (C303-6) receives a feed from the washer switch (C278-2),
it outputs a feed (C303-2) to the wash/wipe switch (C278-4) on a yellow/light
green wire. Power flows out through the wash/wipe switch (C278-1) and onto
the wiper motor (C030-3), which operates at slow speed. When the washer
switch is released, the delay unit will operate the wipers for a further 3 cycles.
Once this has been completed, feed to the wash/wipe switch is cut by the delay
unit and the park circuit is initiated.
Rear Wiper
The rear wiper switch (C918-1) is supplied by fuse 3 of the passenger
compartment fuse box on a green wire. When the switch is in the on position
(C915-1), power is fed to the rear screen wiper motor (C388-2) on a red/light
green wire. The wiper motor (C388-1) is earthed on a black wire.
Park Circuit
Positioning the wiper switch to the off position cuts power to the wiper motor
on the red/light green wire. The park circuit operates to return the wiper to its
park position. The park switch (C079-2), integral to the wiper motor unit,
receives a 12 volt supply from fuse 3 of the passenger compartment fuse box
(C580-6) on a green wire. The park switch is closed with the wiper in any
position except its park position
With the park switch closed, power flows across the park switch (C079-1) to the
wiper switch (C916-1) on a brown/light green wire. Power flows through the
wiper switch (C915-1) to the wiper motor (C388-2) on a red/light green wire.
The wiper motor is earthed (C388-1) on a black wire.
Rear Wash
The rear wash switch (C918-1) is supplied by fuse 3 of the passenger
compartment fuse box on a green wire. When the switch is closed (C917-1),
power is fed to the rear screen washer pump (C021-2) on a black/light green
wire. The washer pump (C021-1) is earthed on a black wire. The rear screen
wash does not operate the rear wiper. 
						

							DESCRIPTION AND OPERATION
4.18
DEFENDER 97 MY
EXTERIOR LAMPS - Brake and Reverse Lamps
DESCRIPTION
The brake lamps illuminate when the ignition is in position II and the brake
pedal is depressed. The reverse lamps illuminate when the ignition is in
position II and reverse gear is selected.
OPERATION
Feed from the positive battery terminal is connected to the engine compartment
fuse box (C632-1) by a brown wire. Current passes through fusible link 2
(C907-2) and is connected to the ignition switch (C028-1) by a brown wire.
When the ignition switch is in position II, power flows across the switch
(C094-1) and is connected to fuse 17 of the passenger compartment fuse box
(C580-33) by a white wire. Current flows across the fuse (C580-34) and feeds
the brake pedal switch (C075-1) and the reverse lamp switch (C167-2), which
are connected in parallel. Both switches are fed by green wires.
Brake Lamps
When the brake pedal is depressed, the brake pedal switch closes and power
flows through the switch. The brake pedal switch (C029- 1) is connected to the
LH tail lamp (C404-2), the trailer pick-up (C416-1), and the RH tail lamp
(C401-2) by green/purple wires. All brake lamps are earthed on black wires.
Reverse Lamps
When reverse gear is selected, the reverse lamp switch is closed. Current
flows across the reverse lamp switch (C167-1) to the RH reverse lamp
(C455-2), and the LH reverse lamp (C490-1) on green/brown wires. Both
reverse lamps are earthed on black wires. 
						

							DESCRIPTION AND OPERATION
DEFENDER 97 MY4.19
EXTERIOR LAMPS - Head, Side and Number Plate Lamps
DESCRIPTION
The lights are operated from the lighting switch located on the steering column.
The lighting switch has two positions. Position 1 switches on the tail lamps, the
number plate lamps, and front side lamps. Position 2 additionally switches on
the front headlamps. When the headlamps are on, the column switch can be
used to switch between main beam and dipped beam.
The headlamps can be flashed with the lights on or off, by pulling the column
switch towards the driver.
OPERATION
Feed from the positive battery terminal is connected to the engine compartment
fuse box (C632-1) by a brown wire. Current passes through fusible link 1 and
fusible link 2, which are connected in parallel. Power from fusible link 1 (C907-
1) feeds the lighting switch (C041-1) on a brown wire.
Side Lamps
With thelighting switch in the side lamps position, power flows through the light
switch (C041-2) to fuse 16 (C580-31) and fuse 15 (C580-29) of the passenger
compartment fuse box on red wires. Fuses 16 and 15 are connected in parallel,
fuse 16 feeding the RH lamps, fuse 15 the LH lamps.
Fuse 16 of the passenger compartment fuse box (C580-32) is connected to the
RH front side lamp (C537-2) by a red/orange wire. The lamp is then earthed
(C537-1) on a black wire. Fuse 16 also feeds the RH trailer pick-up (C418-1)
on a red/orange wire. This is connected in series with the RH tail lamp
(C401-3). The tail lamp is earthed (C401-1) on a black wire. Also connected in
parallel with the RH front side lamp is the side lamp instrument pack warning
lamp (C233-5), which is fed by a red/orange wire. The warning lamp is earthed
(C233-2) by a black wire. 
						

							DESCRIPTION AND OPERATION
4.20
DEFENDER 97 MY
Fuse 15 of the passenger compartment fuse box (C580-30) is connected to the
LH front side lamp (C538-2) by a red/black wire. The lamp is then earthed
(C538-1) on a black wire. Connected in parallel with the LH front side lamp is
the LH trailer pick-up (C877-1), which is also fed by a red/black wire. The trailer
pick-up (C877-2) is connected in series to the LH tail lamp (C404-3) by a
red/black wire. The tail lamp is earthed (C404-1) on a black wire.
Headlamps
With the lighting switch in the main beam position, power flows through the
switch (C041-4) to the headlamp relay (C282-87) on a blue wire. The relay coil
(C282-85) is energized when the ignition switch is in position II, and is
earthed (C282-86) on a black wire.
Dipped beam
When the relay coil is energized, it allows current to flow across the relay
(C282-30) to the column switch (C036-1) on a blue wire. The column switch
(C036-6) is connected to the dim dip relay (C048-8) by a blue/red wire. As the
dim dip relay is not energized, current is allowed to flow from the relay (C048-2)
to fuses 11 and 12 of the passenger compartment fuse box. Both fuses are fed
by blue/red wires, and are connected in parallel. Fuse 11 feeds the RH
headlamp, fuse 12 the LH headlamp.
Fuse 11 of the passenger compartment fuse box (C580-22) is connected to the
RH headlamp (C011-2) by a blue/black wire. This illuminates the headlamp
dipped beam and is earthed (C011-3) on a black wire.
Fuse 12 of the passenger compartment fuse box (C580-24) is connected to the
LH headlamp (C009-2) by a blue/black wire. This illuminates the headlamp
dipped beam and is earthed (C009-3) on a black wire.