Land Rover Defender Electrical Library 3rd Edition Nas Rover Manual

CIRCUIT OPERATION
DEFENDER 90 NAS25With the column switch in the dip position, power from the column switch (C36-6) is fed
to fuses 7 and 8 of the passenger compartment fuse box (C580-13) on a blue/red wire.
With the column switch in the main beam position, power from the column switch (C36-
5) is fed to fuses 9 and 10 of the passenger compartment fuse box (C580-17) on a
blue/white wire via a header joint (C289).  A feed is also supplied through the header
joint (C289) to the instrument pack main beam...

CIRCUIT OPERATION
26DEFENDER 90 NASEXTERIOR LAMPS - Lights On Alarm   
DESCRIPTION  
If the side lights are switched on when the ignition is in the off position, opening either
the drivers door or passengers door will cause the lights on alarm to sound.  
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 5 of the
engine compartment fuse box which are connected in series....

CIRCUIT OPERATION
DEFENDER 90 NAS27INDICATORS / HAZARD WARNING LIGHTS   
DESCRIPTION  
The indicators are controlled from the steering column switch and operate when the
ignition switch is in position II.  Moving the column switch for a left turn causes the left
hand indicator lights to flash.  Moving the column switch for a right turn causes the right
hand indicators to flash.  
The hazard light switch is located towards the center of the dash panel. Hazard operation
is not dependent on the position of...

CIRCUIT OPERATION
28DEFENDER 90 NASRight turn  
Moving the column switch to the right turn position allows power to flow through the
switch (C36-2) to  the trailer connector (C499-3), the RH rear direction indicator light
(C402-2), RH front direction indicator light (C2-1) and instrument pack RH indicator
warning light (C230-9) on green/white wires. The flasher unit (C547-30) is connected to
the instrument pack trailer warning light (C233-1) by the light green purple wire. All
lights are grounded on...

CIRCUIT OPERATION
DEFENDER 90 NAS29INTERIOR LAMPS  
DESCRIPTION  
Two interior lamps are provided, one in the front and one in the rear of the vehicle.  The
front interior light can be switched on manually using its integral switch.  If either front
door is or tail door is opened, both lights are illuminated.  The lights are controlled by the
multi-function ECU.  The ECU contains a time out feature which switches off the interior
lights after a specified time period if either of the doors is left open,...

CIRCUIT OPERATION
30DEFENDER 90 NASINTERIOR ILLUMINATION  
DESCRIPTION  
The automatic gearbox selector is illuminated when the ignition switch is in position II.
When the side lights are switched on, the interior controls and gauges are illuminated so
that they can be easily located during night driving, the gearbox selector illumination is
dimmed to prevent dazzling.  Two levels of illumination, high and low, can be selected
using the dimmer switch.  
OPERATION  
Feed from the positive battery terminal...

CIRCUIT OPERATION
DEFENDER 90 NASREV: 9/9731Power 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)....

CIRCUIT OPERATION
32DEFENDER 90 NASREV: 9/97INSTRUMENTS  
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...

CIRCUIT OPERATION
DEFENDER 90 NASREV: 9/9733· 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...

CIRCUIT OPERATION
34DEFENDER 90 NASREV: 9/97With 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...