Defender Electric Diagrams. Manual - part 19

 

  Index      Land Rover     Land Rover Defender Electric Diagrams - manual 1997 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  17  18  19  20   ..

 

 

Defender Electric Diagrams. Manual - part 19

 

 

CIRCUIT OPERATION

DEFENDER 90 NAS

REV: 9/97

31

Power from the dimmer circuit flows through the following on red/white wires; 

• 

Left hand heater control illumination (C942-1). 

• 

Tachometer illumination (C936-1). 

• 

Speedometer illumination (C932-1). 

• 

Fuel gauge illumination (C935-1). 

• 

Right hand heater control illumination (C941-1). 

• 

Coolant temperature gauge illumination (C943-1). 

• 

Cigar lighter illumination (C74-1). 

• 

HRW switch illumination (C947-7). 

• 

Rear wiper switch illumination (C79-7). 

• 

Rear washer switch illumination (C73-8). 

• 

Clock illumination (C948-1). 

• 

Hazard warning switch illumination (C96-11). 
All illumination lamps are grounded on black wires. 

CIRCUIT OPERATION

32

DEFENDER 90 NAS

REV: 9/97

INSTRUMENTS  

DESCRIPTION  

The vehicle relays information to the driver via the instrument pack. The instrument pack
contains lights and analogue gauges.  The color of the light  denotes the severity of the
information, warning lights are red, caution lights are orange, green and blue lights
indicate that a  system is operating.  

The analogue gauges relay information to the driver such as engine speed and engine
temperature.  

OPERATION  

Feed from the positive battery terminal is connected to the engine compartment fuse box
(C632-1) by the brown wire.  Current passes through fusible link 1 and fusible link 5 of
the engine compartment fuse box which are connected in series. Fusible link 5 (C570-2)
is connected to the ignition switch (C28-1) by the brown wire.  

With the ignition switch in position 'II', power flows through the switch (C94-1) to fuse 1
of the passenger compartment fuse box (C580-1) and to the in-line resistor (C38-1) on
white wires.  The in-line resistor (C37-2) is connected to the ground side of the
instrument pack ignition/no charge warning light (C230-5) by the yellow/brown wire.  

Fuse 1 of the passenger compartment fuse box is connected to the instrument pack (C230-
4) by the white/green wire via a header joint (C287) and feeds the following warning
lights; 

• 

Seat belt warning light - grounded (C230-1) on the white/black wire via the seat belt
buckle switch (C100-2).  Illuminates with the ignition in position 'II' and seat belt
not fastened. 

• 

Differential warning light - grounded (C233-8) on the black/blue wire through the
differential lock unit (C306-1). Illuminates with the ignition in position 'II' and
differential lock engaged. 

• 

Oil pressure warning light - grounded (C230-3) on the white/brown wire via a
header joint (C288) through the oil pressure switch (C187-1). Illuminates with the
ignition in position 'II' and engine oil pressure below minimum. 

CIRCUIT OPERATION

DEFENDER 90 NAS

REV: 9/97

33

• 

Brake/system warning light - grounded (C230-6) on the white/yellow wire, via a
header joint (C285), through the handbrake switch (C91-1) or brake fluid level
switch (C26-1). Illuminates with the ignition in position 'II' and the handbrake
applied or when the brake fluid level drops below minimum. As a bulb check, in the
event of the handbrake not being applied, the lamp will illuminate for 3 seconds
after the ignition is first turned on. This function is served by the Warning Lamp
Check Unit which provides an alternative ground path for the lamp during the timed
period.

• 

Ignition/no charge warning light - grounded (C230-5) on the yellow/brown wire via
the diode (C116-1) and generator (C185-1) on the brown/yellow wire.  The
ignition/no charge warning light illuminates if the generator produces no output
voltage. See charging and starting.  Fuse 1 of the passenger compartment fuse box
feeds the following: 

• 

Instrument pack engine immobilization warning light (C233-3) on the white/green
wire.  The light is grounded (C233-10) on the red/slate wire through the engine
immobilization unit (C306-1).  Illuminates with the ignition in position 'II' and
engine immobilized. 

• 

Instrument pack speedometer (C932-2) on the white/green wire.  The speedometer
is grounded (C932-3) on a black wire and receives a road speed signal (C932-1)
from the speed sensor (C195-3) on the black/red wire. 

• 

Instrument pack tachometer (C938-1) on the white/green wire.  The tachometer is
grounded (C937-1) on a black wire and receives the engine speed signal  (C937-1)
from the generator (C183-1) on the white/slate wire. 

• 

Instrument pack fuel gauge (C860-2) on the white/green wire.  The fuel gauge is
grounded (C860-1) on a black wire and receives the fuel level signal (C860-3) from
the fuel tank unit (C113-1) on the green/black wire. 

• 

Instrument pack coolant temperature gauge (C940-2) on the white/green wire.  The
coolant temperature gauge is grounded (C940-3) on a black wire and receives the
coolant temperature signal (C940-1) from the coolant temperature sensor (C113-1)
on the green/black wire.  

The instrument pack sidelights warning light is illuminated when the lighting switch is in
the sidelights or headlights position.  Fusible link 4 of the engine compartment fuse box
(C573-2) is connected to the lighting switch (C41-1) by the brown wire.

CIRCUIT OPERATION

34

DEFENDER 90 NAS

REV: 9/97

With the lighting switch in the on position, power flows across the switch (C41-2) to fuse
12 of the passenger compartment fuse box (C581-1) on the red wire.  Fuse 12 of the
passenger compartment fuse box supplies the instrument pack sidelights warning light
(C233-3) on the red/orange wire.  The warning light is grounded (C233-2) on a black
wire.

The instrument pack LH indicator warning light operates when the hazard warning switch
is operated or when the column switch is positioned for a left turn with the ignition switch
in position 'II'.  With the hazard switch on, power is supplied from the hazard switch
(C96-6) to the LH indicator warning light (C230-10) via a header joint (C286) on the
green/red wire. The warning light is grounded (C233-2) on a black wire.  With the
ignition switch in position 'II' and the column switch positioned for a left turn,  power is
supplied to the warning light (C230-10) from the column switch (C36-4) via a header
joint (C286) on the green/red wire.  

The instrument pack RH indicator warning light operates when the hazard warning switch
is operated or when the column switch is positioned for a right turn with the ignition
switch in position 'II'.  With the hazard switch on, power is supplied from the hazard
switch (C96-3) to the RH indicator warning light (C230-9) via a header joint (C286) on
the green/white wire. The warning light is grounded (C233-2) on a black wire.  With the
ignition switch in position 'II' and the column switch positioned for a right turn,  power is
supplied to the warning light (C230-9) from the column switch (C36-2) via a header joint
(C286) on the green/white wire.  

The instrument pack trailer warning light flashes once when the hazard warning switch is
operated or when the column switch is positioned for a left or right turn with the ignition
switch in position 'II'.  Power is supplied to the trailer warning light (C233-1) from the
flasher unit (C547-30) on the red/slate wire. The trailer warning light is grounded (C233-
2) on a black wire.  

The instrument pack main beam warning light illuminates when headlight main beam is
selected from the column switch or headlight flash is operated.  With headlight main beam
selected or headlight flash operated, power from the column switch (C36-5) supplies the
main beam warning light (C233-5) on the blue/white wire.  The main beam warning light
is grounded (C233-2) on a black wire.  

The instrument pack heated rear window warning light illuminates when the engine is
running and the HRW switch is depressed momentarily to signal the multi-function ECU
to switch the heating element on (see Heated Rear Window). Power from the HRW relay
(C44-30) is supplied to the HRW warning light (C929-1) on the white/black wire.  The
warning light is grounded (C928-1) on a black wire. 

 

 

 

 

 

 

 

Content   ..  17  18  19  20   ..