Discovery 2. Manual - part 367

 

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Discovery 2. Manual - part 367

 

 

INSTRUMENTS

DESCRIPTION AND OPERATION

88-13

Transfer box neutral warning lamp

The transfer box neutral warning lamp illuminates to inform the driver that the transfer box is in neutral. The warning 
lamp utilises an amber LED with a clear legend which is to ISO design standards. There is no self-check for this 
warning lamp. If the transfer box neutral warning lamp is illuminated the audible warning speaker will also chime.

There are two configurations for this warning lamp:

l

NAS, Canada and Japan = warning lamp enabled.

l

Rest of World = warning lamp disabled.

The instrument pack provides the power input and the BCU provides the signal to illuminate the warning lamp. The 
transfer box in neutral information is provided by a switch on the transfer box, this sends an analogue signal to the 
BCU. The BCU commands the warning lamp on using the serial link to the instrument pack.

INSTRUMENTS

88-14

DESCRIPTION AND OPERATION

Overspeed warning lamp

The overspeed warning lamp within the instrument pack utilises an amber LED and a clear legend. The BCU 
illuminates the LED when the vehicle speed has exceeded 77 mph (123 km/h) and remains on until the vehicle speed 
falls below 74 mph (118 km/h), providing the driver with a visible warning. There is no self-check for this warning lamp.

There are two configurations for this warning lamp:

l

Gulf  = symbol.

l

All other markets  = disabled.

The instrument pack provides the power input and the warning lamp is controlled by the instrument pack according 
to PWM signal received from the ECM. The road speed information is derived from the SLABS ECU.

The lamp activation thresholds are shown in the table below

Lamp on

Lamp off

Input pulse, Hz

165.75

158.83

Road speed, mph (km/h)

77 (123)

74 (118.5)

INSTRUMENTS

DESCRIPTION AND OPERATION

88-15

Instrument illumination

Dimmer switch

The instrument pack contains 3 bulbs to illuminate the dials. Depending on market the bulbs are illuminated either 
from the side lamps feed with no dimmer control or from a PWM dimmer control located on the dashboard. A PWM 
dimmer is used so finer control of the instrument illumination can be achieved.

The input is either direct from the side lamp power feed or from the PWM dimmer control. The instrument pack 
provides the earth path to illuminate the lamps.

INSTRUMENTS

88-16

DESCRIPTION AND OPERATION

Direction indicator warning lamps

The direction indicator warning lamp within the instrument pack utilises a green LED and a clear legend. The LED 
flashes at the same rate as the external indicators, providing the driver with a visible warning.

Operating the left-hand indicator switch instructs the BCU to activate the left-hand indicator warning lamp. 

Operating the right indicator switch instructs the BCU to activate the right-hand indicator warning lamp.

There is no self-test performed at ignition on for these warning lamps.

The power input for the LED is supplied by the instrument pack via fuse 27. The earth path for the warning lamps is 
from the BCU.

 

 

 

 

 

 

 

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