Diagnosis And Testing - High Intensity Discharge Headlamps - 300M Special - Chrysler 2004 Concorde Service Manual

8L - 20 LAMPS/LIGHTING - EXTERIOR
HEADLAMP (Continued)
CONDITION
HEADLAMPS DO NOT
ILLUMINATE
HEADLAMPS ILLUMINATE
CONTINUOUSLY WITH
IGNITION ON
INSTRUMENT PANEL
LAMPS DO NOT DIM OR
ILLUMINATE
DIAGNOSIS AND TESTING - HIGH INTENSITY
DISCHARGE HEADLAMPS - 300M SPECIAL
The High Intensity Discharge (HID) headlamps are
supplied B+ voltage and ground by the same connec-
tor used to power the normal halogen low beam
lamp. The low beam system is different from there
forward. The ballast module is mounted to the bot-
tom of the headlamp unit (Fig. 23). The ballast mod-
ule has internal circuit protection to prevent module
damage in case of an open or shorted circuit. If the
module senses a short or open circuit condition, it
will not operate the lamp/igniter.
The headlamp unit assembly must be removed to
perform the following tests (Refer to 8 - ELECTRI-
CAL/LAMPS/LIGHTING - EXTERIOR/HEADLAMP
UNIT - REMOVAL).
POSSIBLE CAUSES
1. No voltage to headlamps.
2. No Z1-ground at headlamps.
3. Faulty headlamp switch.
4. Faulty dimmer switch.
5. Broken connection between BCM
and headlamp/parking lamp relay.
6. Faulty parking lamp/headlamp
relay.
7. Faulty Body Control Module
1. Check headlamp switch circuit
G52 for continuity. If no continuity.
2. Check headlamp switch return
circuit L80 for continuity. If no
continuity. (BCM will automatically do
this if no continuity is detected.)
3. Check circuit L43 left side and L44
right side for a short to battery
between the headlamp switch and
the headlamp relay.
4. Stuck relay.
5. Faulty Body Control Module
1. No voltage to dimmer switch.
2. No Z1-ground at headlamps.
3. Faulty dimmer switch.
1. Repair open headlamp circuit, refer to
Wiring Diagrams.
2. Repair circuit ground, refer to Wiring
Diagrams.
3. Replace headlamp switch.
4. Replace headlamp switch.
5. Check Junction Block. continuity.
Service as necessary.
6. Replace relay.
7. Replace Body Control Module
1. Repair circuit.
2. Repair circuit.
3. Repair circuit.
4. Replace relay.
5. Replace Body Control Module
1. Check fuse. If good repair open
headlamp circuit, refer to Wiring
Diagrams.
2. Repair circuit ground, refer to Wiring
Diagrams.
3. Replace dimmer switch.
(1) Inspect lamp/igniter assembly for a burned out
lamp. If lamp is burned out it will appear black or
smoky, similar to a normal halogen bulb. If lamp
looks OK, go to Step 2.
(2) Check for B+ battery voltage at the two pin
connector going into the ballast module. Refer to Wir-
ing Diagrams for connector location. If battery volt-
age and a good ground are present, go to Step 3. If
B+ voltage and a good ground are not present, refer
to Wiring Diagrams for circuit and connector loca-
tions to find short or open circuit.
(3) Plug in a known good ballast module and check
for lamp operation. If lamp lights, replace ballast
module. If lamp still fails to light, replace lamp/ig-
niter assembly.
CORRECTION
LH