L322 Range Rover System Description and Operation
LIGHTING
DESCRIPTION AND OPERATION 86-2-27
Operation
General
The following section describe the functionality of the individual light circuits. The control of the circuits is performed
by coding data in the LCM EEPROM. This coding is programmed on the production line and some coding for lamp
functionality is country specific.
Direction Indicator and Hazard Warning Lamps
With the ignition switch in position I or II, the direction indicators can be operated. When the column switch is moved
to the left or right direction position the direction indicator lamps are activated with a pulse rate of 640 milliseconds
and a pulse duty factor of 50:50. If the operation is in the illuminated phase and the direction indicator is switched off,
the flashing phase will end. If the switch position is rapidly moved to from the left position to the right position (or visa
versa), the applicable direction indicator lamps are switched over immediately.
If one of the vehicle or trailer direction indicator bulbs, with the exception of the side repeater lamps, is defective, the
flashing frequency is doubled.
If the ignition is in position I or II and a left or right direction indicator is active, depressing the hazard warning switch
will operate the hazard warning lamps, overriding the direction indicator function. when the hazard warning lamp
switch is pressed a second time, the hazard warning lamp function is deactivated and the direction indicator operation
reinstated, if still selected on.
If the ignition is in position I or II and the hazard warning lamps are active, operating the column switch for the left or
right direction indicators will suspend the hazard warning lamp operation and activate the selected direction indicator.
When the direction indicator column switch is moved to the off position, the hazard warning function will be reinstated.
If the hazard warning lamps have been activated by an I and K Bus message to the LCM in response to a crash
detection, the hazard warning lamps can be switched off using the hazard warning lamp switch. If the hazard warning
lamps have been activated by the BCU due to an anti-theft alarm trigger, the hazard warning lamps can only be
switched off by a deactivate message from the BCU. The hazard warning lamps will also deactivate after 5.5 minutes.
The direction indicator warning lamps and the direction indicator sound are controlled by the instrument pack. They
are activated by the instrument pack on receipt of a lamp status message from the LCM. The direction indicator
warning lamps and the sounder are synchronised with this message with the direction indicator lamp illumination
frequency.
Parking Lamps
The parking lamp function is controlled using the direction indicator column switch. If the ignition is off and the direction
indicator switch is moved to the left or right position, the selected parking lamps will be illuminated. The front parking
lamp is illuminated, along with the top bulb in the rear tail lamp. On NAS vehicles the applicable side marker lamps
are also illuminated. The number plate lamps and the lower bulb in the tail lamp for the selected side are deactivated.
No instrument pack or fascia illumination is activated. If the ignition is on and the direction indicator switch is in the
left or right position, the selected side lamps will not be activated when the ignition is subsequently switched off.
Side Lamps
If the light control switch is in the side lamp or headlamp position, the front side lamps and rear tail lamps are activated.
Both the upper and lower tail lamp bulbs are active along with the number plate lamps. On NAS vehicles, the side
marker lamps are also active.
The instrument pack and fascia illumination remains illuminated at the brightness determined by the position of the
dimmer control.
Light Control Switch Illumination
When the ignition is in position I or II, the switch legends on the light control switch are illuminated at maximum
brightness when the light control switch is in the 'O' (off) position. when the light control switch is rotated to the side
or headlamp position the legend illumination is dimmed.
