air condition CHRYSLER VOYAGER 1996 Repair Manual

CONDITION POSSIBLE CAUSES CORRECTION
LEFT TURN SIGNAL OPERATES
PROPERLY BUT RIGHT TURN
SIGNAL FLASHES FAST1. FAULTY RIGHT FRONT OR
RIGHT REAR TURN SIGNAL LAMP.
2. FAULTY WIRING CONNECTION
FROM JUNCTION BLOCK TO
RIGHT FRONT OR RIGHT REAR
TURN SIGNAL LAMP.
3. FAULTY GROUND WIRING
CONNECTION FROM RIGHT
FRONT OR RIGHT REAR TURN
SIGNAL LAMP.
4. FAULTY MULTI-FUNCTION
SWITCH CONTACTS.
5. FAULTY TERMINALS IN
JUNCTION BLOCK.1. REPLACE RIGHT FRONT OR
RIGHT REAR TURN SIGNAL LAMP.
2. REPAIR OR REPLACE WIRING
CONNECTION FROM JUNCTION
BLOCK TO RIGHT FRONT OR
RIGHT REAR TURN SIGNAL LAMP.
3. REPAIR OR REPLACE FAULTY
GROUND WIRING CONNECTION
TO RIGHT FRONT OR RIGHT
REAR TURN SIGNAL LAMP.
4. REPLACE FAULTY MULTI-
FUNCTION SWITCH.
5. REPLACE JUNCTION BLOCK.
BOTH TURN SIGNAL
INDICATORS IN MESSAGE
CENTER DO NOT FLASH IN
CONJUNCTION WITH OUTSIDE
TURN SIGNAL LAMPS1. FAULTY GROUND WIRING
CONNECTION FROM COWL
GROUND SPLICE.1. REPAIR OR REPLACE WIRING
CONNECTION FROM COWL
GROUND SPLICE.
LEFT OR RIGHT TURN SIGNAL
INDICATOR IN MESSAGE
CENTER DOES NOT FLASH IN
CONJUNCTION WITH OUTSIDE
TURN SIGNAL LAMPS, BUT
OTHER INDICATOR PERFORMS
PROPERLY1. FAULTY INDICATOR LAMP IN
MESSAGE CENTER.
2. FAULTY WIRING CONNECTION
BETWEEN MESSAGE CENTER
AND JUNCTION BLOCK.1. REPLACE FAULTY INDICATOR
LAMP IN MESSAGE CENTER.
2. REPAIR OR REPLACE FAULTY
WIRING CONNECTION BETWEEN
MESSAGE CENTER AND
JUNCTION BLOCK.
NSTURN SIGNAL AND FLASHERS 8J - 7
DIAGNOSIS AND TESTING (Continued)

COMBINATION FLASHER DIAGNOSIS WITH DRL
CONDITION POSSIBLE CAUSES CORRECTION
SYSTEM WILL NOT FLASH
HAZARD WARNING LAMPS1. FAULTY (20) AMP FUSE N
POWER DISTRIBUTION CENTER
(PDC).
2. FAULTY WIRING CONNECTION
BETWEEN BOTTOM SIDE OF PDC
AND JUNCTION BLOCK.
3. FAULTY GROUND FEED TO
MULTI-FUNCTION SWITCH.
4. FAULTY HAZARD WARNING
SWITCH CONTACT.
5. COMBINATION FLASHER/DRL
MODULE NOT PLUGGED INTO
JUNCTION BLOCK.
6. FAULTY COMBINATION
FLASHER/DRL MODULE.
7. FAULTY TERMINALS IN
JUNCTION BLOCK.1. REPLACE FAULTY FUSE IN
PDC.
2. REPAIR FAULTY WIRING
CONNECTION FROM PDC TO
JUNCTION BLOCK.
3. REPAIR OR REPLACE FAULTY
GROUND WIRE FEED TO
MULTI-FUNCTION SWITCH.
4. REPLACE FAULTY MULTI-
FUNCTION SWITCH.
5. PLUG COMBINATION FLASHER/
DRL MODULE INTO JUNCTION
BLOCK.
6. REPLACE FAULTY
COMBINATION FLASHER/DRL
MODULE.
7. REPLACE JUNCTION BLOCK.
SYSTEM WILL FLASH HAZARD
WARNING LAMPS BUT WILL
NOT FLASH RIGHT OR LEFT
TURN SIGNAL LAMPS1. FAULTY (10) AMP FUSE IN THE
JUNCTION BLOCK.
2. FAULTY COMBINATION
FLASHER/DRL MODULE.
3. FAULTY MULTI-FUNCTION
SWITCH CONTACTS.
4. FAULTY TERMINALS IN
JUNCTION BLOCK.1. REPLACE FAULTY FUSE IN
JUNCTION BLOCK.
2. REPLACE COMBINATION
FLASHER/DRL MODULE.
3. REPLACE FAULTY MULTI-
FUNCTION SWITCH.
4. REPLACE JUNCTION BLOCK.
RIGHT TURN SIGNAL
OPERATES PROPERLY BUT
LEFT TURN SIGNAL FLASHES
FAST
(Hazard mode can be used for a
system check)1. FAULTY LEFT FRONT OR LEFT
REAR TURN SIGNAL LAMP.
2. FAULTY WIRING CONNECTION
FROM JUNCTION BLOCK TO LEFT
FRONT OR LEFT REAR TURN
SIGNAL LAMP.
3. FAULTY GROUND WIRING
CONNECTION FROM LEFT
FRONT OR LEFT REAR TURN
SIGNAL LAMP.
4. FAULTY MULTI-FUNCTION
SWITCH CONTACTS.
5. FAULTY TERMINALS IN
JUNCTION BLOCK.1. REPLACE LEFT FRONT OR
LEFT REAR TURN SIGNAL LAMP.
2. REPAIR OR REPLACE WIRING
CONNECTION FROM JUNCTION
BLOCK TO LEFT FRONT OR LEFT
REAR TURN SIGNAL LAMP.
3. REPAIR OR REPLACE FAULTY
GROUND WIRING CONNECTION
TO LEFT FRONT OR LEFT REAR
TURN SIGNAL LAMP.
4. REPLACE FAULTY MULTI-
FUNCTION SWITCH.
5. REPLACE JUNCTION BLOCK.
8J - 8 TURN SIGNAL AND FLASHERSNS
DIAGNOSIS AND TESTING (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
LEFT TURN SIGNAL OPERATES
PROPERLY BUT RIGHT TURN
SIGNAL FLASHES FAST
(Hazard mode can be used for a
system check)1. FAULTY RIGHT FRONT OR
RIGHT REAR TURN SIGNAL LAMP.
2. FAULTY WIRING CONNECTION
FROM JUNCTION BLOCK TO
RIGHT FRONT OR RIGHT REAR
TURN SIGNAL LAMP.
3. FAULTY GROUND WIRING
CONNECTION FROM RIGHT
FRONT OR RIGHT REAR TURN
SIGNAL LAMP.
4. FAULTY MULTI-FUNCTION
SWITCH CONTACTS.
5. FAULTY TERMINALS IN
JUNCTION BLOCK.1. REPLACE RIGHT FRONT OR
RIGHT REAR TURN SIGNAL LAMP.
2. REPAIR OR REPLACE WIRING
CONNECTION FROM JUNCTION
BLOCK TO RIGHT FRONT OR
RIGHT REAR TURN SIGNAL LAMP.
3. REPAIR OR REPLACE FAULTY
GROUND WIRING CONNECTION
TO RIGHT FRONT OR RIGHT
REAR TURN SIGNAL LAMP.
4. REPLACE FAULTY MULTI-
FUNCTION SWITCH.
5. REPLACE JUNCTION BLOCK.
BOTH TURN SIGNAL
INDICATORS IN MESSAGE
CENTER DO NOT FLASH IN
CONJUNCTION WITH OUTSIDE
TURN SIGNAL LAMPS1. FAULTY GROUND WIRING
CONNECTION FROM COWL
GROUND SPLICE.1. REPAIR OR REPLACE WIRING
CONNECTION FROM COWL
GROUND SPLICE.
LEFT OR RIGHT TURN SIGNAL
INDICATOR IN MESSAGE
CENTER DOES NOT FLASH IN
CONJUNCTION WITH OUTSIDE
TURN SIGNAL LAMPS, BUT
OTHER INDICATOR PERFORMS
PROPERLY1. FAULTY INDICATOR LAMP IN
MESSAGE CENTER.
2. FAULTY WIRING CONNECTION
BETWEEN MESSAGE CENTER
AND JUNCTION BLOCK.1. REPLACE FAULTY INDICATOR
LAMP IN MESSAGE CENTER.
2. REPAIR OR REPLACE FAULTY
WIRING CONNECTION BETWEEN
MESSAGE CENTER AND
JUNCTION BLOCK.
NSTURN SIGNAL AND FLASHERS 8J - 9
DIAGNOSIS AND TESTING (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
TURN SIGNAL AND HAZARD
WARNING FLASHERS
FUNCTION PROPERLY BUT
DAYTIME RUNNING LIGHTS
(DRL) DO NOT COME ON WHILE
DRIVING
(The brake lamp in the message
center remains illuminated under
the circumstances noted to the
right in step #3.0 through 3.5
unless the lamp is burned out.)
(Headlamps, either low or high
beam, remain illuminated under
the circumstances noted to the
right in step #4.0 through 4.3 even
though the headlamp switch is
OFF.)1. FAULTY GROUND FEED TO
JUNCTION BLOCK FROM
GROUND STUD CONNECTOR
THROUGH I/P HARNESS.
2. FAULTY GROUND FEED
THROUGH JUNCTION BLOCK TO
CAVITY #11 IN POSITION #3 OF
THE JUNCTION BLOCK.
3.0. FAULTY PARK BRAKE
SWITCH.
3.1. PARK BRAKE INPUT CIRCUIT
FALSELY GROUNDED. COULD BE
THE G09 CIRCUIT WHICH IS A
(20) GA. GY/BK WIRE BETWEEN
THE MESSAGE CENTER AND THE
JUNCTION BLOCK,
3.2. OR BETWEEN THE PARK
BRAKE SWITCH AND THE
JUNCTION BLOCK,
3.3. OR BETWEEN THE BRAKE
PRESSURE SWITCH AND THE
JUNCTION BLOCK,
3.4. OR BETWEEN THE IGNITION
SWITCH AND THE JUNCTION
BLOCK,
3.5. OR A SHORTED IGNITION
SWITCH (CONTACT SHOULD
ONLY BE MADE WHEN IN START
POSITION).
4.0. L93 CIRCUIT FALSELY
GROUNDED BETWEEN JUNCTION
BLOCK AND MULTI-FUNCTION
SWITCH.
4.1. L307 CIRCUIT FALSELY
GROUNDED BETWEEN
HEADLAMP SWITCH AND BODY
CONTROL MODULE.
4.2. HEADLAMP SWITCH
SHORTED.
4.3. HEADLAMP CONTROL
OUTPUT FALSELY GROUNDED BY
BODY CONTROL MODULE.1. REPLACE GROUND CIRCUIT TO
JUNCTION BLOCK.
2. REPLACE JUNCTION BLOCK.
3.0. REPLACE THE PARK BRAKE
SWITCH.
3.1-3.4. REPAIR THE G09 CIRCUIT
TO ELIMINATE THE FALSE
GROUND SOURCE.
3.5. REPLACE IGNITION SWITCH.
4.0. REPAIR OR REPLACE FAULTY
WIRING CONNECTION BETWEEN
JUNCTION BLOCK AND MULTI-
FUNCTION SWITCH.
4.1. REPAIR OR REPLACE FAULTY
WIRING CONNECTION BETWEEN
HEADLAMP SWITCH AND BODY
CONTROL MODULE.
4.2. REPLACE SHORTED
HEADLAMP SWITCH.
4.3. REPLACE BODY CONTROL
MODULE.
8J - 10 TURN SIGNAL AND FLASHERSNS
DIAGNOSIS AND TESTING (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
BLADES CHATTER 1. FOREIGN SUBSTANCE SUCH
AS POLISH ON GLASS OR
BLADES.
2. ARMS TWISTED, BLADE AT
WRONG ANGLE ON GLASS.
3. BLADE STRUCTURE BENT.
4. BLADE ELEMENT HAS
PERMANENT SET.1. CLEAN GLASS AND BLADE
ELEMENT WITH NON-ABRASIVE
CLEANER.
2. REPLACE ARM.
3. REPLACE BLADE.
4. REPLACE BLADE ELEMENT.
WIPER KNOCK AT REVERSAL 1. LINKAGE BUSHINGS WORN.
2. ARMATURE ENDPLAY IN
MOTOR.1. REPLACE WORN LINK. REFER
TO WIPER LINKAGE REMOVAL
AND INSTALLATION.
2. REPLACE WIPER MOTOR.
REFER TO WIPER MOTOR
REMOVAL AND INSTALLATION.
WIPER MOTOR WILL NOT RUN 1. BLOWN FUSE.
2. NEW FUSE BLOWS.
3. NEW FUSE BLOWS.
4. NO VOLTAGE AT MOTOR.
5. POOR GROUND.1. REPLACE FUSE, AND RUN
SYSTEM.
2. CHECK FOR SHORT IN WIRING
OR SWITCH.
3. REPLACE FUSE, REMOVE
MOTOR CONNECTOR, TURN
SWITCH ON, FUSE DOES NOT
BLOW, REPLACE MOTOR.
4. CHECK SWITCH AND WIRING
HARNESS. REFER TO GROUP 8W,
WIRING DIAGRAMS.
5. REPAIR GROUND WIRE
CONNECTION AS NECESSARY.
NSWINDSHIELD WIPERS AND WASHERS 8K - 3
DIAGNOSIS AND TESTING (Continued)

LAMPS
CONTENTS
page page
BULB APPLICATION...................... 25
EXTERIOR LAMP BULB SERVICE............ 9
EXTERIOR LAMP SERVICE................. 14HEADLAMP ALIGNMENT................... 5
INTERIOR LAMPS........................ 18
LAMP DIAGNOSIS........................ 1
LAMP DIAGNOSIS
INDEX
page page
GENERAL INFORMATION
ELECTRONIC DAYTIME RUNNING LIGHT (DRL).1
GENERAL INFORMATION.................. 1SAFETY PRECAUTIONS................... 1
DIAGNOSIS AND TESTING
DIAGNOSTIC PROCEDURES................ 2
GENERAL INFORMATION
GENERAL INFORMATION
NS vehicles use lighting on the interior and exte-
rior of the vehicle for illuminating and indicating
purposes. Lighting circuits are protected by fuses.
Lighting circuits require an overload protected power
source, on/off device, lamps and body ground to oper-
ate properly. Plastic lamps require a wire in the har-
ness to supply body ground to the lamp socket.
Replace sockets and bulbs that are corroded.
Some of the interior and exterior lighting functions
are governed by the body controller. The headlamp,
dome, and the door ajar switches provide signals to
the body controller. The body controller in turn acti-
vates relay(s) in order to provide either a ground or
feed line to the appropriate lamp(s).
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.
Begin electrical system failure diagnosis by testing
related fuses in the fuse block and power distribution
center. Verify that bulbs are in good condition andtest continuity of the circuit ground. Refer to Group
8W, Wiring Diagrams, for component location and cir-
cuit information.SAFETY PRECAUTIONS
WARNING: EYE PROTECTION SHOULD BE USED
WHEN SERVICING GLASS COMPONENTS. PER-
SONAL INJURY CAN RESULT.
CAUTION: Do not touch the glass of halogen bulbs
with fingers or other possibly oily surface, reduced
bulb life will result.
Do not use bulbs with higher candle power than
indicated in the Bulb Application table at the end of
this group. Damage to lamp and/or Daytime Run-
ning Lamp Module can result.
Do not use fuses, circuit breakers or relays hav-
ing greater amperage value than indicated on the
fuse panel or in the Owners Manual.
When it is necessary to remove components to ser-
vice another, it should not be necessary to apply
excessive force or bend a component to remove it.
Before damaging a trim component, verify hidden
fasteners or captured edges are not holding the com-
ponent in place.
ELECTRONIC DAYTIME RUNNING LIGHT (DRL)
The Combination Flasher/DRL is a module provid-
ing turn signal, hazard warning, and daytime run-
NSLAMPS 8L - 1

HEADLAMP DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
HEADLAMPS ARE DIM
WITH ENGINE IDLING OR
IGNITION TURNED OFF1. Loose or corroded battery cables. 1. Clean and secure battery cable clamps
and posts.
2. Loose or worn generator drive belt. 2. Adjust or replace generator drive belt.
3. Charging system output too low. 3. Test and repair charging system. Refer to
Group 8A.
4. Battery has insufficient charge. 4. Test battery state-of -charge. Refer to
Group 8A.
5. Battery is sulfated or shorted. 5. Load test battery. Refer to Group 8A.
6. Poor lighting circuit Z1-ground. 6. Test for voltage drop across Z1-ground
locations. Refer to Group 8W.
7. Low beam headlamp / foglamp fuse
blown.7. Locate cause of blown fuse and repair.
HEADLAMP BULBS BURN
OUT FREQUENTLY1. Charging system output too high. 1. Test and repair charging system. Refer to
Group 8A.
2. Loose or corroded terminals or
splices in circuit.2. Inspect and repair all connectors and
splices. Refer to Group 8W.
HEADLAMPS ARE DIM
WITH ENGINE RUNNING
ABOVE IDLE1. Charging system output too low. 1. Test and repair charging system. Refer to
Group 8A.
2. Poor lighting circuit Z1-ground. 2. Test for voltage drop across Z1-ground
locations. Refer to Group 8W.
3. High resistance in headlamp circuit. 3. Test amperage draw of headlamp circuit.
4. Low beam headlamp / fog lamp
fuse blown.4. Locate cause of blown fuse and repair.
HEADLAMPS FLASH
RANDOMLY1. Poor lighting circuit Z1-ground. 1. Test for voltage drop across Z1-ground
locations, refer to Group 8W.
2. High resistance in headlamp circuit. 2. Test amperage draw of headlamp circuit.
3. Loose or corroded terminals or
splices in circuit.3. Inspect and repair all connectors and
splices. Refer to Group 8W.
HEADLAMPS DO NOT
ILLUMINATE1. No voltage to headlamps. 1. Repair open headlamp circuit. Refer to
Group 8W.
2. No Z1-ground at headlamps. 2. Repair circuit ground. Refer to Group 8W.
3. Faulty headlamp switch. 3. Replace headlamp switch.
4. Faulty headlamp dimmer (multi-
function) switch.4. Replace multi-function switch.
5. Broken connector terminal or wire
splice in headlamp circuit.5. Repair connector terminal or wire splice.
6. Defective or burned out bulb. 6. Replace bulb.
7. Body controller malfunction. 7. Refer to appropriate body controller
diagnostics.
NSLAMPS 8L - 3
DIAGNOSIS AND TESTING (Continued)

FOG LAMP DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
FOG LAMPS ARE DIM WITH
ENGINE IDLING OR IGNITION
TURNED OFF.1. Loose or corroded battery
cables.1. Clean and secure battery cable
clamps and posts.
2. Loose or worn generator drive
belt.2. Adjust or replace generator drive
belt.
3. Charging system output too low. 3. Test and repair charging system.
Refer to Group 8A,
4. Battery has insufficient charge. 4. Test battery state-of -charge.
Refer to Group 8A.
5. Battery is sulfated or shorted. 5. Load test battery. Refer to Group
8A.
6. Poor lighting circuit Z1-ground. 6. Test for voltage drop across
Z1-ground locations. Refer to Group
8W.
FOG LAMP BULBS BURN OUT
FREQUENTLY1. Charging system output too high. 1. Test and repair charging system.
Refer to Group 8A.
2. Loose or corroded terminals or
splices in circuit.2. Inspect and repair all connectors
and splices. Refer to Group 8W.
FOG LAMPS ARE DIM WITH
ENGINE RUNNING ABOVE IDLE1. Charging system output too low. 1. Test and repair charging system.
Refer to Group 8A.
2. Poor lighting circuit Z1-ground. 2. Test for voltage drop across
Z1-ground locations. Refer to Group
8W.
3. High resistance in fog lamp
circuit.3. Test amperage draw of fog lamp
circuit.
FOG LAMPS FLASH RANDOMLY 1. Poor lighting circuit Z1-ground. 1. Test for voltage drop across
Z1-ground locations. Refer to Group
8W.
2. High resistance in fog lamp
circuit.2. Test amperage draw of fog lamp
circuit.
3. Faulty fog lamp switch. 3. Replace fog lamp switch.
4. Loose or corroded terminals or
splices in circuit.4. Inspect and repair all connectors
and splices. Refer to Group 8W.
FOG LAMPS DO NOT ILLUMINATE 1. Blown fuse for fog lamp. 1. Replace fuse. Refer to Group
8W.
2. No Z1-ground at fog lamps. 2. Repair circuit ground. Refer to
Group 8W.
3. Faulty fog lamp switch. 3. Replace fog lamp switch.
4. Broken connector terminal or
wire splice in fog lamp circuit.4. Repair connector terminal or wire
splice.
5. Defective or burned out bulb. 5. Replace bulb.
8L - 4 LAMPSNS
DIAGNOSIS AND TESTING (Continued)

LAMPS
CONTENTS
page page
BULB APPLICATION..................... 17
HEADLAMP ALIGNMENT.................. 5
LAMP BULB SERVICE.................... 8LAMP DIAGNOSIS....................... 1
LAMP SERVICE........................ 13
LAMP DIAGNOSIS
INDEX
page page
GENERAL INFORMATION
HEADLAMP LEVELING MOTOR............. 2
INTRODUCTION........................ 1SAFETY PRECAUTIONS.................. 1
DIAGNOSIS AND TESTING
DIAGNOSTIC PROCEDURES.............. 2
GENERAL INFORMATION
INTRODUCTION
GS vehicles use lighting on the interior and exte-
rior of the vehicle for illuminating and indicating
purposes. Lighting circuits are protected by fuses.
Lighting circuits require an overload protected power
source, on/off device, lamps and body ground to oper-
ate properly. Plastic lamps require a wire in the har-
ness to supply body ground to the lamp socket.
Replace sockets and bulbs that are corroded.
Some of the interior and exterior lighting functions
are governed by the body controller. The headlamp,
dome, and the door ajar switches provide signals to
the body controller. The body controller in turn acti-
vates relay(s) in order to provide either a ground or
feed line to the appropriate lamp(s).
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.Begin electrical system failure diagnosis by testing
related fuses in the fuse block and power distribution
center. Verify that bulbs are in good condition and
test continuity of the circuit ground. Refer to Group
8W, Wiring Diagrams, for component location and cir-
cuit information.
SAFETY PRECAUTIONS
WARNING: EYE PROTECTION SHOULD BE USED
WHEN SERVICING GLASS COMPONENTS. PER-
SONAL INJURY CAN RESULT.
CAUTION: Do not touch the glass of halogen bulbs
with fingers or other possibly oily surface, reduced
bulb life will result.
Do not use bulbs with higher candle power than
indicated in the Bulb Application table at the end of
this group. Damage to lamp and/or Daytime Run-
ning Lamp Module can result.
Do not use fuses, circuit breakers or relays hav-
ing greater amperage value than indicated on the
fuse panel or in the Owners Manual.
When it is necessary to remove components to ser-
vice another, it should not be necessary to apply
excessive force or bend a component to remove it.
Before damaging a trim component, verify hidden
fasteners or captured edges are not holding the com-
ponent in place.
NS/GSLAMPS 8L - 1

HEADLAMP LEVELING MOTOR
This vehicle is equipped with a remote headlamp
leveling system. This system allows the driver to
adjust the vertical headlamp aim from the interior of
the vehicle to compensate for passenger or cargo
load. A headlamp leveling switch is located in the
instrument panel and controls the headlamp leveling
motor found on the back of the headlamp module.
DIAGNOSIS AND TESTING
DIAGNOSTIC PROCEDURES
When a vehicle experiences problems with the head-
lamp system, verify the condition of the battery connec-
tions, charging system, headlamp bulbs, wire
connectors, relay, high beam dimmer switch and head-
lamp switch. Refer to Group 8W, Wiring Diagrams, for
component locations and circuit information.
HEADLAMP DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
HEADLAMPS ARE DIM
WITH ENGINE IDLING OR
IGNITION TURNED OFF1. Loose or corroded battery cables. 1. Clean and secure battery cable clamps
and posts.
2. Loose or worn alternator drive
belt.2. Adjust or replace alternator drive belt.
3. Charging system output too low. 3. Test and repair charging system. Refer
to Group 8A.
4. Battery has insufficient charge. 4. Test battery state-of -charge. Refer to
Group 8A.
5. Battery is sulfated or shorted. 5. Load test battery. Refer to Group 8A.
6. Poor lighting circuit Z1-ground. 6. Test for voltage drop across Z1-ground
locations. Refer to Group 8W.
HEADLAMP BULBS BURN
OUT FREQUENTLY1. Charging system output too high. 1. Test and repair charging system. Refer
to Group 8A.
2. Loose or corroded terminals or
splices in circuit.2. Inspect and repair all connectors and
splices. Refer to Group 8W.
HEADLAMPS ARE DIM
WITH ENGINE RUNNING
ABOVE IDLE1. Charging system output too low. 1. Test and repair charging system. Refer
to Group 8A.
2. Poor lighting circuit Z1-ground. 2. Test for voltage drop across Z1-ground
locations. Refer to Group 8W.
3. High resistance in headlamp
circuit.3. Test amperage draw of headlamp circuit.
HEADLAMPS FLASH
RANDOMLY1. Poor lighting circuit Z1-ground. 1. Test for voltage drop across Z1-ground
locations, refer to Group 8W.
2. High resistance in headlamp
circuit.2. Test amperage draw of headlamp circuit.
3. Loose or corroded terminals or
splices in circuit.3. Inspect and repair all connectors and
splices. Refer to Group 8W.
HEADLAMPS DO NOT
ILLUMINATE1. No voltage to headlamps. 1. Repair open headlamp circuit. Refer to
Group 8W.
2. No Z1-ground at headlamps. 2. Repair circuit ground. Refer to Group
8W.
3. Faulty headlamp switch. 3. Replace headlamp switch.
4. Faulty headlamp dimmer
(multi-function) switch.4. Replace multi-function switch.
5. Broken connector terminal or wire
splice in headlamp circuit.5. Repair connector terminal or wire splice.
6. Defective or burned out bulb. 6. Replace bulb.
7. Body controller malfunction. 7. Refer to appropriate body controller
diagnostics.
8L - 2 LAMPSNS/GS
GENERAL INFORMATION (Continued)