Interior Lights Dimming Circuit; Description; Special Tools And Equipment - GMC Chevrolet Camaro 1998 Service Manual

8-160 Lighting Systems
1/P Compartment Lamp
Ground is applied from G200 through circuit 650 to
the 1/P compartment lamp. When the 1/P compartment
door is opened, voltage is applied by the BCM
through circuit 149 to the 1/P compartment lamp.
Delayed Illumination
The BCM keeps the interior lights on for approximately
25 second after the doors and rear compartment are
closed. The BCM gradually decreases the voltage
on circuit 149 until the lamps are off. The lamps
immediately go out under either of the following
conditions:
• The ignition switch is turned to the run or start
position
• The vehicle doors are locked
Exit Lighting
The BCM illuminates the courtesy lamps for
approximately five seconds after the ignition key is
remove from the ignition switch. The lamps
immediately go out under either of the following
conditions:
• The ignition key is reinserted into the ignition
switch
• The vehicle doors are locked
Illuminated Entry
When the remote control door lock transmitter is used
to access the vehicle, the BCM applies voltage
through circuit 149 to the interior lights. The lights
remain illuminated for approximately 40 seconds or
until the ignition is turned to the start position.
Inadvertent Power Control
The BCM turns off lamps that are left on to conserve
battery power. The BCM removes voltage from
circuit 149 and all lamps are turned off 1 O minutes
after the ignition switch is turned to the off position.
After the 1 O minute period, the BCM turns the lamps
back on under any of the following conditions:
• Either door is opened
• The rear compartment is opened
• The 1/P compartment is opened
• Either of the courtesy/reading lamp switches are
turned on.
• The remote control door lock transmitter is used
to perform any function
Body and Accessories
Interior Lights Dimming Circuit
Description
Circuit Operation
The 1/P dimmer switch controls the brightness of the
following:
• The incandescent illumination lamps of the
instrument cluster
• The vacuum fluorescent (VF) displays of the radio
Incandescent Dimming
When the headlamp switch is in the PARK or HEAD
position or in a low light condition with DRL active,
voltage is applied through circuit 9 to the 1/P dimmer
switch. Voltage from the 1/P dimmer switch is
applied through circuit 44, the 1/P dimmer fuse and
circuit 8 to the incandescent lamps. Turning the
1/P dimmer switch changes the voltage on circuit 8.
The changing voltage varies the intensity of the lamps.
Vacuum Fluorescent Dimming
When the headlamp switch is in the PARK or HEAD
position or in a low light condition with DRL active,
voltage is applied through circuit 9 to the 1/P dimmer
switch. Voltage from the 1/P dimmer switch is
applied through circuit 44, the 1/P dimmer fuse and
circuit 8 to the radio VF display. The radio VF display
dims for night viewing. Turning the 1/P dimmer
switch changes the voltage on circuit 8. The changing
voltage varies the intensity of the radio VF display.
Special Tools and Equipment
Illustration
6302
Tool Number/ Description
J
25300-D
Headlamp Aimer
(
(
(