Discovery electrical Manual — part 46

HEATED REAR SCREEN AND MIRROR DEMISTERS

F8

2

CIRCUIT DIAGRAM





F8-1





NP

BG

BR

B

NP

BG

BR

E200

See Ground Dis-
tribution

E201

See Ground Dis-
tribution

ELECTROCHROMIC REAR VIEW MIRROR

G1

1

CIRCUIT DIAGRAM

& (& $+

% ('%!

$&'$# *'

)%& *'

& (& $+

!'%$%$"

% * %%$%

GY

GY

GN

LGO

B

B

GY

GN

B

See Fuse Details

See Fuse Details

See Ground Dis-
tribution

Reversing Lamps

Automatic
Transmission

Manual Trans-
mission

Automatic
Transmission

Manual Trans-
mission

MULTI–FUNCTION UNIT (MFU)

G4

CIRCUIT OPERATION

1

REV: 11/97

CIRCUIT OPERATION

Multi–Function Unit (MFU)

The multi–function unit (MFU) is mounted on the
rear of the passenger compartment fusebox and has
an input to operation of the following:

D

Heated rear screen

D

Heated front screen

D

Courtesy lights

D

Side and headlights

D

Rear fog guard lamps

D

Headlamp power wash

D

Front wipers

D

Rear wash/wipe

Diagnostic Procedure

1.

Close all doors and the tailgate.

NOTE: If the oil pressure switch goes open circuit
(engine is started) during the following procedure,
the MFU will exit the diagnostic mode immediately.

2.

Press and hold the heated rear screen switch

and switch on the ignition.

3.

Release the heated rear screen switch within 2

seconds and the MFU will beep to indicate that it’s in
diagnostic mode 1.

4.

Press the heated rear screen switch; the MFU

will beep twice. In turn, operate each of the following
switches, heated front screen, rear fog guard lamps,
side lights, headlights, front wiper and rear wiper.
The MFU will beep twice each time a switch is oper-
ated.

5.

Pressing the heated rear screen again will cause

the MFU to enter diagnostic mode 2.

6.

The MFU will provide outputs to the following in

order given below:

D

Heated rear screen relay energised for 2 seconds

D

Heated front screen energised for 2 seconds

D

Courtesy lights energised for 2 seconds

D

Dim dip relay energised for 2 seconds

D

Rear fog guard lamp energised for 2 seconds

D

Headlamp power wash energised for half a second

D

Front wiper energised for half a second

D

Rear wipe/wash energised for half a second

7.

The MFU will then exit the diagnostic mode.

MULTI–FUNCTION UNIT (MFU)

G4

2

CIRCUIT DIAGRAM

REV: 11/97

S288

15

F 14

10 A

0

[1]

6

C208

E201

See Ground Dis-
tribution

P126
Fascia Fuse Box

G

15

F 13

10 A

E

15

F 1

15 A

F

Z148
Multi–Function
Unit (MFU)

P126
Fascia Fuse Box

30

F 12

10 A

I

Warnings and
Indicators

WN

16

C204

WN

3

C206

B

1

C142

X149
Oil Pressure Switch

[1]

0.19–0.40 Bar
(2.75–5.75 psi)

18

C217

N

A

HJ11

0

[1]

1

C142

X149
Oil Pressure Switch

[1]

0.19–0.40 Bar
(2.75–5.75 psi)

3

C1027

Except NAS

NAS