LR3/Disco 3
The ignition/no charge indicator is controlled by the instrument cluster software and illuminated by CAN signals from the
Engine Control Module (ECM). The indicator illuminates in a red color when the ignition is moved to position II and is
extinguished when the engine is started.
If the indicator remains illuminated after the engine has started or illuminates when driving, the alternator charge output
has failed.
6. Low Oil Pressure Indicator
The low oil pressure indicator is hardwired directly to the instrument cluster. The indicator is illuminated in a red color
when the ignition is moved to position II. When the engine is started and the oil pressure increases the low oil pressure
indicator should extinguish. If the indicator remains illuminated or illuminates when driving the vehicle should be stopped
at the earliest opportunity and the engine switched off until the fault is rectified.
7. Glow Plugs Active Indicator (Diesel models only)
The glow plugs active indicator is illuminated by the instrument cluster software on receipt of a CAN message from the
Engine Control Module (ECM). The indicator is located in the same position as the MIL on petrol models. The indicator
illuminates in an amber color when the ignition is moved to position II. The indicator illumination period varies with engine
temperature and is some cases will not illuminate when the engine temperature is high. The indicator is controlled by CAN
signals from the ECM which equate to the time which the glow plugs are energised to pre-heat the combustion chambers.
For additional information, refer to
Glow Plug System
(303-07C Glow Plug System)
When the glow plug heating time is complete, the indicator is extinguished indicating to the driver that the engine can now
be started.
8. Malfunction Indicator Lamp (MIL)
The MIL is controlled by the instrument cluster software on receipt of CAN signals from the ECM. The indicator is
illuminated for a bulb check by the ECM when the ignition is moved to position II. The lamp is extinguished when the
engine starts.
If the MIL remains illuminated after the engine is started or illuminates while driving, a fault is present and must
investigated at the earliest opportunity. Illumination of the MIL indicates that there is an On-Board Diagnostic (OBD) fault
which will cause excessive emissions output. This may relate to either an engine management system fault or a
transmission fault.
9. Supplementary Restraint System (SRS) Warning Indicator
The SRS warning indicator is controlled by the restraints control module which transmits CAN signals to the instrument
cluster. The warning indicator is illuminated for 6 seconds for a bulb check by the restraints control module when the
ignition is moved to position II. If a fault is detected in the SRS the restraints control module illuminates the warning
indicator in a red color until the fault is rectified.
The instrument cluster also performs a check of the indicator LED functionality. Failure of the indicator LED is transmitted
to the driver in the form of a '5R5' (SRS) message which is displayed in the trip meter display.
10 and 11. Left and Right Turn Indicators
The turn indicators are controlled by the instrument cluster software on receipt of CAN signals on the medium speed CAN
bus from the Central Junction Box (CJB). When the turn signal indicator switch is operated, the CJB transmits a signal to
the instrument cluster to operate the applicable turn indicator. The instrument cluster software controls the flash rate of
the indicator which flashes in a green color. During normal turn signal indicator operation the indicator flashes slowly,
accompanied simultaneously by a sound from the instrument cluster sounder. If a fault exists, the instrument cluster
responds to a fault message from the CJB and flashes the indicator at double speed.
The hazard warning indicators are also controlled by the CJB and the instrument cluster software and operate in the
same manner as the turn signal indicators. The hazard warning indicators can operate with the ignition switched off,
therefore, the CAN signal from the CJB to the instrument cluster to operate the left and right hand turn signal indicators
will also 'wake-up' the instrument cluster.
12. High Beam Indicator
The high beam indicator is controlled by the instrument cluster software on receipt of CAN signals on the medium speed
CAN bus from the Central Junction Box (CJB). When the high beam switch is moved to the high beam or headlight flash
position, the CJB transmits a CAN message to the instrument cluster to illuminate the high beam indicator in a blue color.
13. Tyre Pressure Monitoring System (TPMS) Indicator
