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Lighting
Operation
Overview
The power supply for the interior lamp operation is from the
battery, through fusible link 9 in the engine compartment fuse
box to the passenger compartment fusebox. The feed is from
fuse 38 to the BCM and is permanently live.
If an interior lamp is left on and the BCM has seen no LIN
Bus activity after a 15 minute period, after the handset has
been removed, it will enter sleep (power saving) mode and
extinguish all interior lamps. When a LIN Bus message wakes
the BCM, the illumination will be restored if still selected.
When the vehicle is locked with the handset, the BCM will
extinguish the interior lamps. All interior lamps are powered
from Field Effect Transistors (FETs) within the BCM. The PWM
output has number of advantages over a constant direct power
supply. If the power supply voltage increases to above 12V, the
PWM output can be adjusted to supply a constant voltage to
each bulb, increasing bulb life. The PWM output when the
lamps are on is at a frequency of 100 ±10 Hz.
When the interior lamps are illuminated, for example when
a door is opened, the PWM output is increased on a linear
ramp to fully illuminate the interior lamps after a 1.3 second
fade on period. When the interior lamps are extinguished, for
example when the ignition is on, the PWM output is decreased
on a linear ramp to fade the lamps off over a 2.8 second period.
If the interior lights are on when the engine is started, they will
switch off immediately.
Interior Lamps
Interior lamp operation illuminates the following lamps:
• Front interior lamp
• Rear Interior lamp
• Glovebox lamp (where fitted)
• Vanity mirrors illuminationwhere fitted
• Boot lamp
• Fascia and handset docking port LEDs
The interior lamp operation is controlled by the BCM on
receipt of signals from the front interior lamp master switch,
from a door or boot open switch or when the vehicle is
unlocked. The boot and door open switches are the same
switches used by the security system for perimetric alarm
operation.
Each door and boot latch mechanism contains an integral
microswitch.
When a door or the boot is open, the
microswitch contacts are closed completing an earth path to
the BCM. When the door is closed, the earth path is removed
and the connection becomes open circuit.
Version 2.0
The interior lamps have two modes of operation; manual
operation using the momentary switch on the front interior
lamp or automatic operation controlled by the BCM.
Manual Operation
The master switch on the front interior lamp assembly can be
used to switch all the front and rear interior and map reading
lamps on or off. When the interior lamps are switched on or
off manually, automatic fade on or off will not operate and the
lamps will come on or go off immediately.
If the interior lamps are selected on manually, and the doors
are closed and then locked, automatic control will resume and
the lamps will fade off.
If the doors are open and the interior lamps are illuminated by
automatic control, then operation of the switch will extinguish
the lamps and automatic control will be disabled until the doors
are closed.
Automatic Operation
Automatic control of the interior lamps operates on a
number of on and off conditions which are controlled by the
BCM on receipt of signals from various sources. When the
lamps are operating in automatic control, the most recent
lamp operation request will override the current operating
condition.
The interior lamps will gradually illuminate if:
• The vehicle is unlocked using the handset.
• The BCM receives a door or boot open signal.
• The side lamps have been on for more than 30 seconds
and the handset removed.
• The handset is removed within 30 seconds of turning the
headlamps off. The interior lamps will stay on for 30
seconds.
• The ignition is on and a door is opened. The interior
lamps will stay on for 15 minutes or until the door is
closed.
• The interior light switch is pushed when the lamps are
off and alarm is not armed.
• The inertia switch or crash sensor is tripped (in this case,
the lamps illuminate instantly without fade).
The interior lamps will fade OFF if:
• All the doors and the boot are closed and the handset is
docked or ignition on (except if the lamps are switched
on from the momentary switch).
• All the doors and the boot are closed, the lamps will
go off after a 30 second delay (except if the lamps are
switched on from the interior light switch).
• The side lamps have been on for more than 30 seconds
and the handset is removed, the lamps will go off after a
Lighting Systems
743
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