L322 Range Rover System Description and Operation
LIGHTING
86-2-38 DESCRIPTION AND OPERATION
Operation
General
The interior lamp operation is activated by any of the following inputs signals:
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Door switch contacts (front and rear)
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Ignition switch position I (Aux)
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Central locking, lock request
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Central locking remote handset operation
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Crash sensor
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Front interior lamp switch.
The load space lamp and the upper tail door lamps are not switched on with the interior lamps. These lamps are only
activated when the upper tail door is opened. When the upper tail door is opened, the interior lamps, in addition to the
load space lamps, are switched on and are subject to the BCU timers.
Automatic Operation
The automatic control of the interior lamps has several switch on and off conditions as follows:
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The interior lamps are switched on when one or more doors are opened. When all the doors are closed, the
interior lamps are switched off after a delay of 20 seconds. If the vehicle is locked after closing the doors, within
the 20 second period, the lamps go off immediately.
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When the interior lamps are on and the ignition is moved to positions I or II, the lamps go off immediately after
all doors have been closed.
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When the ignition switch is moved to the off position, the interior lamps are switched on for 20 seconds. This timer
is overridden if a door is subsequently opened.
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When the vehicle is unlocked and the doors are closed, the interior lamps can be activated for a further 20 second
period by pressing the 'unlock' button on the remote handset.
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When the vehicle is unlocked from a locked condition, the interior lamps are activated for a 20 second period.
This timer is overridden if a door is subsequently opened.
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If a door is left open, the interior lamps will remain on for 16 minutes. After this period, the BCU timer switches
the interior lamps off to prevent excessive battery drain.
The BCU uses a PWM operation of the interior lamps for the on/off conditions. The lamps are switched on with a 'soft
ramp' of 1.3 seconds. The lamps are switched off with a 'soft ramp' of 2.6 seconds. The soft on/off operation is
controlled by a semiconductor within the BCU.
Manual Operation
The interior lamps can be switched on or off using the manual switch for the front interior lamp. The front interior lamp
switch will switch all interior lamps, front and rear, on or off. If the interior lamps are on when the switch is pressed,
all interior lamps will go off. The on and off automatic switching conditions remain effective even when the manual
switch is used.
If the ignition switch is in position I or II and the front interior lamp switch is used to switch the interior lamps on, the
lamps will remain on continuously whilst the ignition is in position I or II. If the ignition switch is moved to the off
position, the interior lamps will be subject to the 16 minute BCU timer. The interior lamp is immediately switched off
when the vehicle is locked. After a locking procedure, the interior lamp automatic control is reinstated.
The rear interior lamp switch will switch the rear interior lamp only on or off.
Continuous Off
To prevent drain on the battery if the doors are to remain open for some time, the interior lamps can be turned off
permanently. This is stored in the BCU EEPROM and is also activated following a system power down or a reset of
the BCU.
To enter the continuous off condition, the front interior lamp switch must be pressed and held for more than 3 seconds.
The continuous off function can only be disabled by pressing the front interior lamp switch, after which, full automatic
control is resumed. When continuous off is active, the rear interior lamp switch can still be used to switch the rear
interior lamp only on or off.
