Discovery 2. Manual — part 369

INSTRUMENTS

DESCRIPTION AND OPERATION

88-21

Hill Descent Control (HDC) information warning lamp

The HDC information warning lamp within the instrument pack utilises a green LED and a clear legend. On vehicles
fitted with HDC, the HDC switch provides a hard wired voltage to the SLABS ECU to illuminate the LED when HDC
is switched on. This provides the driver with a visible warning that the system is enabled.

When the ignition is switched on, the SLABS ECU illuminates the LED to provide a self-check, providing there is no
fault it will remain illuminated for 3 seconds or until the ignition is switched off.

The power input for the LED is supplied by the instrument pack via fuse 27. The SLABS ECU provides the earth path
to illuminate the warning lamp.

The voltage on the SLABS ECU earth path to the instrument pack is as follows:

l

< 1.8 volts = warning lamp on.

l

> 7.7 volts = warning lamp off.

INSTRUMENTS

88-22

DESCRIPTION AND OPERATION

Brake system warning lamp

The brake system warning lamp within the instrument pack utilises a red LED and a clear legend. If the brake fluid
level is low, the hand brake is operated or there is a brake system fault, the LED will be illuminated providing the driver
with a visible warning.

When the ignition is switched on, the instrument pack illuminates the LED to provide a self-check, providing there is
no fault it will remain illuminated for 3 seconds or until the ignition is switched off.

There are two configurations of the legend for the warning lamp:

l

NAS only.

l

All other markets.

The power input for the LED is supplied by the instrument pack via fuse 27. The hand brake switch, the low brake fluid
level switch or the SLABS ECU provides the earth path illuminating the warning lamp.

The hand brake switch has a separate connection to the vehicle body. The low brake fluid switch connects to an earth
header joint.

On the earth paths to the instrument pack the warning lamp is controlled according to these voltages:

l

< 1.8 volts = warning lamp on.

l

> 7.7 volts = warning lamp off.

INSTRUMENTS

DESCRIPTION AND OPERATION

88-23

Differential lock warning lamp (If fitted)

The differential lock is a device used for rolling road testing only on vehicles up to 03 model year. On vehicles from
03 model year, the differential is a driver selectable option which can also be used for off road driving. Refer to the
service procedures for details of rolling road testing on vehicles up to and from 03 model year.

CAUTION: Engage the differential lock when testing the vehicle on a two wheel rolling road. The propeller
shaft connecting the axle not on the rolling road must also be removed.

Differential lock warning lamp – vehicles up to 03 model year
The differential lock warning lamp within the instrument pack utilises a red LED and a clear legend. When the
differential lock is engaged, using the lever on the side of the transfer box, the differential lock switch is operated and
the warning lamp is switched on providing the driver with a visible warning.

When the differential lock is engaged, the warning lamp will be illuminated continuously when the ignition switch is in
position II.

Differential lock warning lamp – vehicles from 03 model year
The differential lock warning lamp is located in the top left hand corner of the instrument pack and uses an amber LED
and a clear legend. When the differential lock is engaged, the warning lamp illuminates when the ignition is on to
provide a visual indication to the driver that the differential lock is engaged. The instrument pack, simultaneously emits
three audible warning chimes as a confirmation.

When the differential lock is disengaged, the warning lamp is extinguished and the instrument pack simultaneously
emits three audible warning chimes as a confirmation.

All vehicles
The power input for the LED is supplied by the instrument pack via fuse 13 in the engine compartment fusebox. The
differential lock switch or switches provide(s) the earth path illuminating the warning lamp.

The voltage on the differential lock switch or switches to instrument pack earth path produces the following warning
lamp functions:

l

< 1.8 volts = warning lamp on.

l

> 7.7 volts = warning lamp off.

INSTRUMENTS

88-24

DESCRIPTION AND OPERATION

Traction control warning lamp

The traction control warning lamp within the instrument pack utilises a red LED and a clear legend. The traction control
warning lamp informs the driver that the traction control system is enabled. The warning lamp is hard wired to the
SLABS ECU. The SLABS ECU controls the warning lamp on or off via a high or low voltage signal to the instrument
pack.

When the ignition is switched on, the SLABS ECU illuminates the LED to provide a self-check, providing there is no
fault it will remain illuminated for 3 seconds or until the ignition is switched off.

The power input for the LED is supplied by the instrument pack via fuse 27. The SLABS ECU provides the earth path
to illuminate the warning lamp.

The voltage on the SLABS ECU earth path to the instrument pack is as follows:

l

< 1.8 volts = warning lamp on.

l

> 7.7 volts = warning lamp off.