Discovery electrical Manual - part 29

INSTRUMENTS

E1

6

1

C434

Z134
Fuel Pump Mod-
ule

[1]

Fuel Level
Sensor

[1]

B

2

C434

B

See Ground Dis-
tribution

S415

E400

E404

E1-5

C

GB

Z132
Engine Control
Module (ECM)

S2100

Except NAS

NAS

Except NAS

NAS

7

C1017

GB

13

C1026

23

C277

2

C407

WARNINGS AND INDICATORS (EXCEPT NAS)

E2

CIRCUIT OPERATION

1

CIRCUIT OPERATION

Hazard Indicator

If the Hazard Switch (X220) is depressed, a pulsing
voltage is applied to the Hazard Indicator which is
permanently grounded by ground E200.

Direction Indicator

If the Direction Indicator Switch (X116) is turned on,
a pulsing voltage is applied from the Flasher Unit
(Z128) to the Direction Indicator which is
permanently grounded by ground E200.

Trailer Indicator

With the Direction Indicator Switch (X116) turned on,
the Flasher Unit (Z128) also applies a pulsing
voltage to the Trailer Indicator which is permanently
grounded by ground E200.

Main Beam Indicator

With the Headlamps turned on by the Main Lighting
Switch (X145), battery voltage is applied to the Main
Beam Indicator which is also permanently grounded
by ground E200.

MFI–V8 and 300Tdi with EDC

Malfunction Indicator Lamp (Check Engine)

The Malfunction Indicator Lamp (Check Engine) is
grounded by the Engine Control Module (ECM)
(Z132) when a diagnostic trouble code is set.

Diesel

Glow Plug Indicator

The Glow Plug Indicator is grounded by the Glow
Plug Timer Unit (Z135) to indicate that the Glow
Plugs have been activated.

Oil Pressure Warning Light

The oil pressure warning light receives battery
voltage with the Ignition Switch (X134) in position II.
If the engine oil pressure is very low, the Oil
Pressure Switch (X149) will apply ground to the
warning light.

Differential Lock Indicator

The Differential Lock Indicator receives battery
voltage with the Ignition Switch (X134) in position II.
It is grounded by the Differential Lock Switch (X238)
when the Differential is locked.

Brake Warning Light

The brake warning light receives battery voltage with
the Ignition Switch (X134) in position II. It is
grounded by the Brake Fluid Level Switch (X111)
when the brake fluid level is low. It may also be
grounded when the Handbrake Switch (X191) is
closed.

WARNINGS AND INDICATORS (EXCEPT NAS)

E2

CIRCUIT OPERATION

2

ABS Warning Light

The ABS warning light receives battery voltage with
the Ignition Switch (X134) in position II. It is
grounded by the Anti–Lock Brake System ECU
(Z108) or the ABS Warning Relay (K103) in the
event of an ABS problem.

Engine Immobilised Warning Lamp (EIWL)

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 $ #

Flashing = Immobilised

Continuous = Immobilised (Cirrus Fail)

Theft Alarm LED

The Theft Alarm LED receives battery voltage at all
times. It is grounded by the Theft Alarm Unit (Z163)
to indicate the following conditions:

Slow Flash = Immobilised or Immobilised and
armed

Rapid Flash = Perimetrically and Volumetrically
armed

Intermittent Rapid Flash = Perimetrically armed

No Flash for 10 Seconds = Mislock

Continuous = Driver’s door open (or ignition on)
and Immobilised

Transmission/Transfer Box Oil Temperature

Warning Light

The transmission/transfer box oil temperature
warning light is grounded by the Automatic
Transmission Oil Temperature Switch (X108) when
the temperature of the transmission fluid exceeds
130

°

C (266

°

F). The warning light is also grounded

by the Transfer Box Oil Temperature Switch (X174)
when the temperature of the transfer box fluid
exceeds 145

°

C (266

°

F).

Low Fuel Warning Indicator

When the fuel gauge sender’s resistance falls below
approximately 25 Ohms (6 liters/1.5 US gallons), the
Low Fuel Warning Indicator will illuminate to warn
the driver.

Charge Warning Light

The charge warning light receives battery voltage
with the Ignition Switch (X134) in position II. This
warning light is grounded by the Generator (Z106) if
the Generator is not producing normal power output
or the Generator stops turning.

SRS Indicators

The SRS Indicators are controlled by the Air Bag
Diagnostic Control Module (Z151) and the SRS
Indicator Control Circuit of the Instrument Cluster
(Z142) to indicate SRS System faults.

Fasten Seat Belt Indicator

(Gulf States Vehicles Only)

The Fasten Seat Belt Indicator receives battery
voltage with the Ignition Switch (X134) in position II.
The indicator is grounded through the Multi–
Function Unit (MFU) (Z148) and the Driver’s Seat
Buckle Switch (X120). If the Driver’s Seat Belt is
buckled, the Driver’s Seat Belt Buckle Switch opens
and the Indicator turns off.

WARNINGS AND INDICATORS (EXCEPT NAS)

E2

3

CIRCUIT DIAGRAM

LGG

Instruments

Z142
Instrument
Cluster

[13] Illumination

Z128
Flasher Unit

56d

F 4

10 A

P126
Fascia Fuse Box

1

C254

LGU

Warnings and
Indicators

9

4

6

3

G

UW

4

C208

C207

Direction Indica-
tor Lamps

W/L

RN

7

9

RN

C222

Interior Lamps

B

1

E201

C221

[13]

S253

See Ground Dis-
tribution

HJ8

31

31

31

31

31

31

31

31

31

31

31

56a