Range Rover 2. Electrical Manual - part 30

WARNINGS AND INDICATORS

CIRCUIT OPERATION

CIRCUIT OPERATION

All warning Indicators are controlled by Data sent to
the Instrument Cluster (Z142) from the Body
Electrical Control Module (BeCM) (Z238). All data is
transmitted via the serial data lines. The BeCM
(Z238) will provide data based upon input from
various sensors.

Some warning lights may also be accompanied by a
message which will appear in the message centre
display on the instrument pack.

Service Reminder Indicator (SERVICE ENGINE)

Illuminates briefly (for 3 seconds) as a bulb check
when the Ignition switch is turned to position II.

Illuminates continuously when the vehicle reaches
50,000 miles (80,500 km) approx.

Low Fuel Warning Indicator

Illuminates briefly (for 4 seconds) as a bulb check
when the Ignition Switch is turned to position II.

When the fuel gauge sensors resistance value
increases to 175

Ω

(9 liters/2.25 US gallons, the low

fuel warning light will illuminate to warn of the fuel
status. Both Petrol and Diesel sensors are interfaced
to the Instrument Cluster (Z142) via the BeCM
(Z238).

High Temperature Warning Indicator

Illuminates briefly (for 4 seconds) as a bulb check
when the Ignition switch is turned to position II.

The engine coolant temperature gauge sensor has
the capability to sense from –40

C to +130

C. Petrol

and Diesel resistance valves are different.

Both Petrol and Diesel sensors are interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238).

Malfunction Indicator Lamp (CHECK ENGINE)

Illuminates briefly when the Ignition Switch is turned
to position II as a bulb check and extinguishes when
the engine is running. Illumination at any other times
indicates an engine fault.

Both Petrol and Diesel Engine Control Modules
(Z132) are interfaced to the Instrument Cluster
(Z142) via the BeCM (Z238).

Oil Pressure Warning Indicator

Illuminates as a bulb check when the Ignition switch
is turned to position II, and extinguishes when the
engine is running.

The Oil Pressure Switch (X149) is closed with Low
Oil Pressure.

Both Petrol and Diesel switches are interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238).

ABS Warning Indicator

This light illuminates for approximately 1 second
when the Ignition switch is turned to position II, and
then briefly extinguishes before coming on again.
The warning indicator will then remain illuminated
until the vehicle is driven above approximately 5 mph
(7 km/h). If the light does not extinguish or
illuminates again then a fault has occurred with the
ABS system.

If the light remains illuminated once a speed of 5
mph (7km/h) has been reached, or subsequently
illuminates whilst driving, a fault has been detected
by the self–monitoring system. The message centre
will display

ABS FAULT

The ABS System is interfaced to the Instrument
Cluster (Z142) via the BeCM (Z238).

WARNINGS AND INDICATORS

CIRCUIT OPERATION

ETC Warning Indicator (TC)

Illuminates for 3 seconds after the Ignition switch is
turned on and the ABS and traction control systems
have completed their self–checks.

Whilst driving, the TC light will illuminate (for a
minimum of 2 seconds) whenever traction control is
active; the light extinguishing as soon as traction
control ceases. The light flashing (for at least 10
seconds) indicates that the system has been
over–used; it will be available again once the system
components have cooled.

If the light illuminates continuously, a fault with the
system is indicated.

The ABS System is interfaced to the Instrument
Cluster (Z142) via the BeCM (Z238).

Brake Warning Indicator

Illuminates for 3 seconds as a bulb check when the
Ignition switch is turned to position II and also
illuminates when the handbrake is applied and the
Ignition switch is in position II.

The light should extinguish when the handbrake is
fully released or after the bulb check if the
handbrake is off. If the light illuminates whilst driving,
a fault is indicated.

NOTE: If the vehicle has been standing for some
time, it may take up to 40 seconds before the light
extinguishes (in this case, ABS and TC warning
lights will also be illuminated).

The Brake System and Handbrake Switch (X191)
are interfaced to the Instrument Cluster (Z142) via
the BeCM (Z238).

Cruise Active Indicator

When the Cruise Control System has been activated
the indicator will be illuminated. The Cruise System
is interfaced to the Instrument Cluster (Z142) via the
BeCM (Z238).

Charge Warning Indicator

Illuminates as a bulb check when the Ignition switch
is turned to position II and extinguishes when the
engine is running and the Generator (Z106) is
producing normal power. If the Generator (Z106) is
not producing normal power or the Generator (Z106)
stops turning the indicator will illuminate.

Both Petrol and Diesel Generators (Z106) are
interfaced to the Instrument Cluster (Z142) via the
BeCM (Z238).

Fasten Seat Belt Indicator

Illuminates for 6 seconds when the Ignition switch is
turned to position II. When the driver’s seat belt is
buckled, the indicator turns off.

The Driver’s Seat Belt Switch (X120) is interfaced to
the Instrument Cluster (Z142) via the BeCM (Z238).

WARNINGS AND INDICATORS

CIRCUIT OPERATION

Air Suspension Indicator

Illuminates as a bulb check when the Ignition switch
is turned to position II and remains illuminated until 2
seconds after the engine has started.

In addition, the light will illuminate whilst driving
whenever

High

Extended

ride heights are

selected, and also if a fault with the air suspension
system is detected.

The air suspension system is interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238).

Lights

Indicator

This light illuminates when the sidelights and/or
headlights are switched on. It will not illuminate when
parking lights or headlight delay are in operation.

The Main Light Switch is interfaced to the Instrument
Cluster (Z142) via the BeCM (Z238).

Direction Indicators

The left or right warning indicator flashes in time with
the corresponding left or right direction indicator
lamps whenever they are operated. A warning
indicator flashing twice the normal speed indicates
that a direction indicator lamp bulb has failed (the
message centre will indicate which bulb is faulty). If a
trailer is connected and a rear indicator lamp bulb
fails then the message will not be displayed. When
the hazard switch is pressed, both warning indicators
will illuminate in conjunction with the indicator lamps.

The Direction Indicator switches are interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238).

Main Beam Indicator

This indicator illuminates whenever the main beam
headlights are on.

The Main Beam Switch is interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238).

Trailer Indicator

This indicator is only operative when a trailer is
connected to the vehicle via a multi–pin socket. The
indicator flashes in conjunction with the vehicle
direction indicator lamps, thus confirming that the
trailer indicator lamps are operating correctly. In the
event of a failure of a trailer direction indicator lamp,
the warning indicator will not illuminate.

The Trailer Auxilliary Socket is interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238).

Glow Plug Indicator

This indicator illuminates when the Engine Control
Module (Z132) activates the Glow Plug Timer Unit
(Z135).

The Engine Control Module (Z132) is interfaced to
the Instrument Cluster (Z142) via the BeCM (Z238).

Catalyst Warning Indicator (Japan Only)

This indicator illuminates when a fault in the catalyst
system is detected.

The Catalyst Overheat Sensors (X299, X300) and
the Catalyst Amplifier (X301) are interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238).

Audible Warning

Receipt of an audible warning request signal from a
vehicle parameter/message condition shall cause the
BeCM (Z238) to generate the required number of
warning tones. The actuator sounder unit is located
at the rear of the Instrument Cluster (Z142).

See message listing for categories/priority and levels
of audible warnings.

WARNINGS AND INDICATORS

CIRCUIT DIAGRAM

C258

C242

S205

See Fuse Details

F 1

10 A

Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)

C246B

C246A

With Air Condition-
ing

Without Air Condi-
tioning

Z238
Body Electrical
Control Module
(BECM)

Interior Lamps

E2-5

Z142
Instrument
Cluster
[13] Illumina-

tion

[15] Control

Unit and
Message
Centre Dis-
play

[13]

[15]

C242

C256

Z238
Body Electrical
Control Module
(BECM)

E254

LCD

[13]

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