INSTRUMENTS (Description): DESCRIPTION AND OPERATION (page 19 of 37)

INSTRUMENTS

DESCRIPTION AND OPERATION

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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.