Interior Lamps
The interior lighting consist of two groups. This first group includes lamps
that may not be dimmed.
• | Courtesy/ Illuminated Entry Lamps |
• | The Inside Rearview Mirror Lamps |
• | The Vanity Mirror Lamps |
• | The IP Compartment Lamps |
Courtesy Lamps
The courtesy lamps include the instrument panel courtesy lamps, the exterior
courtesy lamps, and the rear view mirror lamps. Turn the courtesy lamps ON manually
by placing the interior lamp switch in the DOME position, by opening a door or opening
the trunk. After all the doors have been closed the courtesy lamps will remain illuminated
approximately 15 seconds after the last door closes. The courtesy lamps will
also turn ON prior to any door being opened, and remain illuminated approximately
30 seconds after the driver removes the ignition key.
The interior lights fuse supplies battery positive voltage to the BCM. The BCM
then applies battery positive voltage to the courtesy lamps through the inadvertant
power supply circuit. When any door or if the trunk is opened, the jam switch contacts
close and the BCM receives a door-open or trunk open input. If the BCM receives
a door lock or unlock input or an trunk open input, the BCM will activate the inadvertant
power circuit, providing battery positive voltage to all of the IP courtesy lamps
and the rearview mirror lamps. The BCM also provides a class 2 message signal
to the driver door module and passenger door module to apply battery positive voltage
to the exterior courtesy lamps. You may use some of the courtesy lamps as reading
lamps by placing the lamp switch in the ON position.
The courtesy lamps will normally turn OFF using the theater dimming feature.
The BCM provides a pulse width modulated ground to the courtesy/reading and inside
rear view mirror lamps for the theater dimming feature. The BCM turns OFF the courtesy
lamps if a door lock command is received after all of the doors are closed, or if
the ignition switch is turned to either the ON or RUN position.
The courtesy lamps will also turn on after an air bag deployment for approximately
15 seconds.
Keyless Entry Interior Illumination
When the driver uses the door key in order to unlock the doors, BCM receives
a door-unlock signal. The BCM must have inputs that indicate that the ignition switch
is OFF, the courtesy lamp switch is OFF and all the doors are closed. The BCM will
then activate the interior lamps. The courtesy lamps will remain ON for 15 seconds
after the door is closed. The BCM will turn off the courtesy lamps through the theater
dimming feature. If the door locks are activated to the LOCK position, or if the
ignition switch is turned to either the RUN or CRANK position, the courtesy lamps
will turn OFF immediately.
When the driver uses the remote function actuator transmitter to unlock the
doors or the trunk or to press the panic button, the BCM will keep the courtesy
lamps ON for 30 seconds. If the door locks are activated to the UNLOCK or
LOCK position, or if the ignition switch is turned to either the RUN or CRANK position,
the courtesy lamps turn OFF immediately. The BCM keeps the courtesy lamps on for
40 seconds after an alarm event is completed.
Vanity Lamps
The interior lights fuse supplies battery positive voltage to the BCM. The BCM
then applies battery positive voltage to the vanity lamps through the inadvertant
power supply circuit. When the vanity mirror cover on the sunshade is opened, its
switch closes providing a ground circuit, and the vanity lamp illuminates.
IP Compartment Lamp
The interior lights fuse supplies battery positive voltage to the BCM. The BCM
then applies battery positive voltage to the IP compartment lamp through the inadvertant
power supply circuit. When the IP compartment is opened, its switch closes providing
a ground circuit, and the IP compartment lamp illuminates.
Underhood Lamp
The interior lights fuse supplies battery positive voltage to the BCM. The BCM
then applies battery positive voltage to the underhood lamp through the inadvertant
power supply circuit. When the underhood is opened, its switch closes providing
a ground circuit, and the underhood lamp illuminates.
Interior Lamps Dimming
The second group includes lamps which may be dimmed. This group may use a combination
of vacuum fluorescent (VF) illumination, incandescent lamps and pulse width modulation
(PWM) illumination.
• | The Door Switches and the Window Switches |
• | The Steering Wheel Controls |
• | The HVAC Control Head Assembly |
• | The Rear Compartment/Fuel Door Release Switch |
• | The Traction/Suspension Control Switch |
• | The Power Folding Top Switch |
• | The Front and Rear Fog Lamp Switch (Export) |
When the ignition switch is turned to the ON position, the vacuum fluorescent
(VF) displays, for radio and HVAC control assembly, the incandescent lamps and the
PWM lamps turn ON at maximum brightness. When the park lamps are ON and the ambient
light sensor indicates low light conditions, all back lighting turn ON at the dimming
level indicated by the IP dimmer switch. At the same time all VF displays dim in
order to match the indicated dimming level. When the headlamp switch is placed in
the PARK position, the BCM energizes the park lamp relay coil control circuit and
dims the interior lamps to the dimming level indicated by the IP dimmer switch.
When the driver selects a dimming setting by moving the IP dimming switch potentiometer,
all back lighting lamps are provided with a specific voltage. When the IP dimmer
switch is moved from MIN to MAX, all VF displays and all back lighting respond from
minimum intensity to maximum brightness in response to the IP dimmer switch.
The driver may select parade mode by manually turning on the park lamps during
daylight conditions.
Driver Controls and Modules
Driver controls include the following components:
• | The Emergency Flasher Switch |
• | The Headlamp Dimmer Switch |
• | The Interior Lamp Switch |
Three modules process the inputs and the controls. The ambient light sensor
supplies the BCM with a signal for daytime conditions or for low light conditions.
• | The Ambient Light Sensor |
• | The Body Control Module (BCM) |
• | The Instrument Panel Cluster (IPC) |
Battery Rundown Protection / Inadvertent Power
The BCM controls the lighting system through circuits that enable both the
exterior lamp functions of the park lamps, the head lamps, the fog lamps, and the
interior lamps. The BCM opens these enabling circuits 20 minutes after the
ignition switch is turned OFF with no lamp switch activity. If the ignition switch
is turned to any position other than OFF, or if a lamp switch is activated during
this 20 minute period, the timer resets for another 20 minutes.