Discovery electrical Manual - part 59

INTERIOR LAMPS

J1

13

REV: 06/97

18

PW

S261

0

[1]

1

C3008

X142
Left Rear Door
Switch

[1]

Open

0

[1]

1

C2087

X118
Right Front Door
Switch

[1]

Open

S309

0

[1]

1

C3009

X163
Right Rear Door
Switch

[1]

Open

1

C306

0

[1]

1

C2086

X150
Left Front Door
Switch

[1]

Open

Theft Alarm Sys-
tem (NAS)

PG

C205

S2106

0

[1]

1

C451

X265
Rear End Door
Switch

[1]

Open

Z148
Multi–Function
Unit (MFU)

2

C277

5

HJ4

Z163
Theft Alarm Unit

1

16

C225

PW

WP

PG

5

Z277
Tailgate Diode

S2013

HJ1

S2135

WP

1

C205

Interior Lamps

PU

S2136

Theft Alarm Sys-
tem (NAS)

NAS
From VIN 550523
& 717859

CIGAR LIGHTER/CLOCK

J2

1

CIRCUIT DIAGRAM



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BLOWER CONTROLS

K1

CIRCUIT OPERATION

1

CIRCUIT OPERATION

Front Blower

With the Ignition Switch (X134) in position II, battery
voltage is applied to the Ignition Load Relay (K127).
The relay is energised, applying battery voltage to
the Front Blower Motor Relay (K192).

When the Front Fan Speed Switch (X247) is turned
to position I, ground is applied to terminal 85 of the
Front Blower Motor Relay (K192). The relay is
energised, applying battery voltage to terminal 2 of
the Front Blower Motor (M101). Ground is applied to
the Front Blower Motor (M101) through all three
resistors of the Front Blower Resistor Unit (Z214).
The Front Blower Motor (M101) then runs at low
speed. When the Front Fan Speed Switch (X247) is
turned to position II, the Front Blower Motor Relay
(K192) remains energised. Battery voltage is still
applied to terminal 2 of the Front Blower Motor
(M101). Ground is now applied to the Front Blower
Motor (M101) through two resistors of the Front
Blower Resistor Unit (Z214) and the Front Fan
Speed Switch (X247). The motor then runs at the
low–medium speed. When the Front Fan Speed
Switch (X247) is turned to position III, the Front
Blower Motor Relay (K192) remains energised.
Ground is now applied to the Front Blower Motor
(M101) through one resistor of the Front Blower
Resistor Unit (Z214) and the Front Fan Speed
Switch (X247). The motor then runs at the
medium–high speed. When the Front Fan Speed
Switch (X247) is turned to position IV, the Front
Blower Motor Relay (K192) remains energised.
Ground is now applied directly to the Front Blower
Motor (M101) through the Front Fan Speed Switch
(X247). The motor then runs at high speed.

Fresh Air Mode

With the Ignition Switch (X134) in position II, battery
voltage is applied to the Ignition Load Relay (K127).
The relay is energised, applying battery voltage to
the Air Recirculation Solenoid In–Line Fuse (P138)
and Air Recirculation Solenoid (K123). When the Air
Supply Selector Switch is moved to the Fresh Air
position, ground is applied to the Air Recirculation
Solenoid (K123). The solenoid now opens the fresh
air intake flap allowing fresh air to enter the vehicle
cabin. When the fresh air intake flap has been fully
opened, the microswitch inside the Air Recirculation
Solenoid (K123) moves to the Fresh Air position
interrupting the ground supply. The solenoid now
stops and remains in the Fresh Air position.

Recirculated Air Mode

With the Ignition Switch (X134) in position II, battery
voltage is applied to the Ignition Load Relay (K127).
The relay is energised, applying battery voltage to
the Air Recirculation Solenoid In–Line Fuse (P138)
and Air Recirculation Solenoid (K123). When the Air
Supply Selector Switch is moved to Recirculate Air
position, ground is applied to the Air Recirculation
Solenoid (K123). The solenoid now closes the fresh
air intake flap allowing only the air inside the vehicle
cabin to circulate. When the fresh air intake flap has
been fully closed, the microswitch inside the Air
Recirculation Solenoid (K123) moves to the
Recirculate Air position interrupting the ground
supply. The solenoid now stops and remains in the
Recirculate Air position.

BLOWER CONTROLS

K1

CIRCUIT OPERATION

2

Rear Blower

With the Ignition Switch (X134) in position II, battery
voltage is applied to the Ignition Load Relay (K127).
The relay is energised, applying battery voltage to
the Rear Blower Motor Relay (K193), the Rear A/C
Fan Speed Relay (K205) and the Rear A/C Control
Relay (K194).

When the Rear A/C System is turned on, the Rear
A/C Switch Amplifier provides ground to the Rear
A/C Control Relay (K194). The relay is energised,
applying ground to the Rear A/C Fan Speed Relay
(K205). The Rear A/C Fan Speed Relay (K205) then
energises. When the Passenger’s Rear Fan Speed
Switch (X246) is turned to position I, ground is
applied to terminal 85 of the Rear Blower Motor
Relay (K193) through the closed switch contacts of
the Rear A/C Fan Speed Relay (K205). The Rear
Blower Motor Relay (K193) energises, applying
battery voltage to terminal 1 of the Rear Blower
Motor (M145).

Ground is applied to the Rear Blower Motor (M145)
through all three resistors of the Rear Blower
Resistor Unit (Z215). The Rear Blower Motor (M145)
then runs at low speed. When the Passenger’s Rear
Fan Speed Switch (X246) is turned to position II, the
Rear Blower Motor Relay (K193) remains energised.
Battery voltage is still applied to terminal 1 of the
Rear Blower Motor (M145). Ground is now applied to
the Rear Blower Motor (M145) through two resistors
of the Rear Blower Motor Resistor Unit (Z215) and
the Passenger’s Rear Fan Speed Switch (X246).
The motor then runs at the low–medium speed.
When the Passenger’s Rear Fan Speed Switch
(X246) is turned to position III, the Rear Blower
Motor Relay (K193) remains energised. Ground is
now applied to the Rear Blower Motor (M145)
through one resistor of the Rear Blower Motor
Resistor Unit (Z215) and the Passenger’s Rear Fan
Speed Switch (Z246).

The motor then runs at medium–high speed. When
the Passenger’s Rear Fan Speed Switch (X246) is
turned to position IV, the Rear Blower Motor Relay
(K193) remains energised. Ground is now applied
directly to the Rear Blower Motor (M145) through the
Passenger’s Rear Fan Speed Switch (X246). The
motor then runs at high speed.