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.
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