Discovery electrical Manual - part 66

COOLING FANS (300TDI WITHOUT EDC)

K5

10

CIRCUIT DIAGRAM

30

F 3
30 A

[1]

B

M

M

A

P125
Engine Compart-
ment Fuse Box

GW

S209

1

C116

85

30

C292

85

86

30

87

86

87

C292

BN

See Fuse Details

K109
Condenser Fan
Relay

BP

1

17

5

C217

C216

Not used

S123

Not used

Z209
Condenser Fan
Control Diode 1

PB

BP

1

C146

X113
Condenser Fan
Coolant Tem-
perature Switch

[1]

< 94

C

(201

F)

[2]

> 100

C

(212

F)

[2]

2

C146

B

1

C182

1

C183

2

C182

2

C183

B

B

See Ground Dis-
tribution

S122

E200

B

M121
Right Con-
denser Fan
Motor

M113
Left Condenser
Fan Motor

B

300Tdi without
EDC

S229

NG

K5-12

K5-4

See Ground Dis-
tribution

S155

E100

COOLING FANS (300TDI WITH EDC)

K5

11

CIRCUIT DIAGRAM

30

F 3
30 A

E100

[1]

B

M

M

A

P125
Engine Compart-
ment Fuse Box

GW

S209

1

C116

85

30

C292

85

86

30

87

86

87

C292

BN

See Fuse Details

K109
Condenser Fan
Relay

BP

1

17

5

C217

C216

Not used

S123

Not used

Z209
Condenser Fan
Control Diode 1

PB

BP

1

C146

X113
Condenser Fan
Coolant Tem-
perature Switch

[1]

< 94

C

(201

F)

[2]

> 100

C

(212

F)

[2]

2

C146

B

See Ground Dis-
tribution

1

C182

1

C183

2

C182

2

C183

B

B

See Ground Dis-
tribution

S122

E200

B

M121
Right Con-
denser Fan
Motor

M113
Left Condenser
Fan Motor

B

300Tdi with EDC

S229

NG

K5-12

K5-4

COOLING FANS

K5

12

CIRCUIT DIAGRAM

0

S244

YB

Z210
Condenser Fan
Control Diode 2

PB

MFI–V8

300Tdi with-
out EDC

300Tdi with EDC

PB

4

5

2

C2025

X225
Front A/C Switch

Compressor
Controls

Interior Lamps

Compressor
Controls

UR

LG

1

3

C2025

WB

E200

See Ground Dis-
tribution

S2056

Blower Controls

N

5

C2022

X247
Front Fan Speed
Switch

1

C2022

E200

See Ground Dis-
tribution

0

I

IV

III

II

4

C2073

NW

[1]

N

2

C2067

2

C2027

K5-11

K5-10

K5-6

NAS

MFI–V8

300Tdi without
EDC
300Tdi with EDC

PB

S2071

2

C217

Not used

PB

K5-9

B

MFI–T16

13

C1027

2

C217

1

C2067

NW

SFI–V8

B

CIRCUIT OPERATION

Voltage for window lift and sunroof operation is
provided to the Window Lift ECU (Z147) from fuses
F1 and F2.  The Window Lift ECU is grounded
through the B wire at ground E200.

Timeout Feature

Fuse F15 applies voltage to the Window Lift ECU
terminal 3 when the ignition switch is on.  When the
ignition switch is turned off, the absence of voltage at
terminal 3 signals the Window Lift ECU to start the
timeout feature.  When the timeout feature is
activated, the Window Lift ECU will allow window and
sunroof operation for an additional 45 seconds.

For NAS vehicles only:
The timeout feature will be cancelled if the driver’

s

door is opened and then closed.  The Window Lift
ECU monitors the door’

s position at terminal 9.

Front Window Operation

When a Front Window Switch is operated, the switch
grounds one of four Window Lift ECU input terminals.
This signals the Window Lift ECU to apply voltage
and ground to the respective window motor.  If the
front window switch is held in the down position for
more than 1/2 second, the express down feature is
activated.  The Window Lift ECU will operate the
window motor until it is completely lowered.

Rear Window

The Window Lift ECU terminal 4 supplies voltage to
the Rear Window Console and door switches for rear
window operation.

When a window console switch is in the ‘

DOWN’

position, voltage is applied to the window motor
through the ‘

up’

 

switch contacts.  The window motors

operate because they are grounded through the
‘

down’

 

contacts of the window console switch.  When

a switch is in the ‘

UP’

 

position, the polarity applied to

the window motor is reversed, causing the motor to
run in the opposite direction and the window to close.

Rear Window Isolation Switch (X187)

The Rear Window Isolation Switch (X187) is placed
in series with the ground supply to the Rear Window
Door Switches (X188,X189).  If the isolation switch is
opened, the ground supply is interrupted, preventing
rear window operation using the rear door switches .

CIRCUIT OPERATION

1

POWER WINDOWS

L1