Headlamp Description - Chrysler Concorde 2004 Service Manual

8L - 16 LAMPS/LIGHTING - EXTERIOR
FRONT POSITION LAMP - EXPORT (Continued)
Fig. 22 FRONT POSITION LAMP BULB
1 - FRONT POSITION LAMP BULB
2 - FRONT POSITION LAMP SOCKET
HEADLAMP
DESCRIPTION
HEADLAMP SYSTEM
The headlamp system is controlled completely by
the Body Control Module (BCM). The BCM controls
the Park lamps, Headlamps, and Front Fog Lamps
using relays located in the Junction Block. Three
wires are connected between the headlamp switch
and the BCM. The first wire contains information
regarding the position of the headlamp switch (Off,
Automatic Headlamps, Automatic Headlamp switch
fog, Park with Fog, Head, or Head with Fog Lamps).
The second wire contains information regarding the
position of the dimmer switch (Dome Lamp, Daytime
Brightness, or Dimming Level). The third wire is a
dedicated signal return (ground) wire.
AUTO HEADLAMP SYSTEM
The Automatic Headlamp system turns the instru-
mentation and exterior illumination lamps ON when
the ambient light levels are low and OFF when light
levels are high.
HEADLAMPS ON WITH WIPERS
For vehicles equipped with the Automatic Head-
lamp System, the instrumentation and exterior illu-
mination lamps will be turned ON when the
headlamp switch is in the AUTO position and the
windshield wipers have been in the intermittent, low
or high mode of operation for more than ten seconds.
When the windshield wipers are turned OFF the
Body Control Module will determine if the instru-
mentation and exterior illumination lamps should
remain ON base upon the current ambient light
level.
LAMP SYSTEMS
Vehicles use lighting on the interior and exterior of
the vehicle for illuminating and indicating purposes.
Lighting circuits are protected by fuses or circuit
breakers. Lighting circuits require an overload pro-
tected power source, on/off device, lamps and body
ground to operate properly. Plastic lamp sockets
require a wire in the harness to supply body ground
to the lamp socket. Lamp sockets that are exposed to
moisture should be coated with Mopar
pose Grease or equivalent to avoid corrosion. If a
socket has become corroded, clean socket and bulb
base with abrasive fiber sanding pad or metallic bris-
tle brush. Replace sockets and bulbs that are
deformed from corrosion that could prevent a contin-
uous body ground.
Wire connectors can make intermittent contact or
become corroded. Before coupling wire connectors,
inspect the terminals inside the connector. Male ter-
minals should not be bent or disengaged from the
insulator. Female terminals should not be sprung
open or disengaged from the insulator. Bent and
sprung terminals can be repaired using needle nose
pliers and pick tool. Corroded terminals appear
chalky or green. Corroded terminals should be
replaced to avoid recurrence of the problem symp-
toms. Wire connector terminals should be coated with
Mopar Multi purpose Grease or equivalent to avoid
corrosion.
Begin electrical system failure diagnosis by testing
related fuses and circuit breakers in the fuse block
and engine compartment. Verify that bulbs are in
good condition and test continuity of the circuit
ground. Refer to Wiring Diagrams, for component
location and circuit information.
HIGH INTENSITY DISCHARGE HEADLAMPS - 300M
SPECIAL
This vehicle is equipped with High Intensity Dis-
charge Headlamps (HID). The HID type lamp is
used in place of the conventional halogen low beam
lamp. High beam lamps remain the same halogen
type.
There are three components in the HID system
(Fig. 23), the ballast module (attached to the bottom
of the headlamp unit), the igniter (plugs into the bal-
last module), and the lamp itself (part of the igniter
assembly and only replaceable with the igniter).
LH
Multi pur-