Discovery electrical Manual - part 32

WARNINGS AND INDICATORS (EXCEPT NAS)

E2

12

CIRCUIT DIAGRAM

Z142
Instrument
Cluster

[3]

Fuel Gauge

[4]

Temperature
Gauge

[8]

CPU

[9]

3–Sec.
Timer

[10] Low Fuel

Warning
and Anti-
slosh Con-
trol

1

C255

[10]

[3]

[4]

[8]

Instruments

9.1 

5

C221

15

F 14

10 A

B

– +

See Fuse Details

15

C208

2

C222

LG

[9]

Warnings and
Indicators

NY

Instruments

Warnings and
Indicators

24

C215

4

C217

Z106
Generator

See Ground Dis-
tribution

S255

S214

P126
Fascia Fuse Box

220 

E201

D+

Instruments

HJ9

1

B

HJ8

S253
HJ8

15

15

15

31

31

31

Not used

15

WARNINGS AND INDICATORS (EXCEPT NAS)

E2

13

CIRCUIT DIAGRAM

P126
Fascia Fuse Box

15

10 A

Z142
Instrument
Cluster

[5]

SRS Indica-
tor Control

[6]

SRS Indica-
tor 1

[7]

SRS Indica-
tor 2

1

P

14

3

C223

3

C252

S

22

C354

Z151
Air Bag Diagnos-
tic Control Mod-
ule

1

C223

8

C204

F 7

See Fuse De-
tails

15

10 A

LG

S214

2

C222

15

C208

F 14

5

C252

G

[6]

[7]

[5]

5

Instruments
Warnings and
Indicators

S253

E201

See Ground Dis-
tribution

1

C221

B




HJ8

6

C252

2

C223

Not used

15

31

16

C209

HJ9

WARNINGS AND INDICATORS (NAS)

E3

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.

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.

Service Reminder Indicator

The Service Reminder Indicator receives battery
voltage with the Ignition Switch (X134) in position II.
The Service Reminder Unit (Z126) grounds the
Service Reminder Indicator when the vehicle
requires service. The Service Reminder Indicator is
also grounded by a 3 second timer as a bulb check.

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. The brake warning light is also grounded by
a 3 second timer as a bulb check.

WARNINGS AND INDICATORS (NAS)

E3

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.

Fasten Seat Belt Indicator

(NAS and 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.

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.