Jeep XJ. Manual — part 120
used for tail light and stop lamp functions. One sin-
gle filament bulb is for turn signal functions. The
other bulb is a single filament bulb used for back-up
light illumination.
OPERATION
Each tail lamp module can be serviced separately.
Each bulb can also be serviced separately. The head-
lamp switch controls tail lamp operation. The multi-
function switch on the steering column controls turn
signal operation, and the back-up light switch con-
trols the back-up light operation. The brake lamp
switch controls the stop lamp function.
FRONT TURN SIGNAL/PARKING LAMP
DESCRIPTION
The front turn signal and parking lamp module
contains a housing, a lens, and two bulbs.
OPERATION
The parking lamp function is controlled by the
headlamp switch. The turn signal function is con-
trolled by the multifunction switch on the steering
column. Each bulb can be serviced separately.
CHMSL (CENTER HIGH MOUNTED STOP LAMP)
DESCRIPTION
The center high mounted stop lamp (CHMSL) is
mounted on the liftgate. The module consists of a
housing, a lens, and a single filament bulb.
OPERATION
The CHMSL is controlled by the brake lamp
switch.
DAYTIME RUNNING LAMPS
DESCRIPTION
The Daytime Running Lights (Headlamps) System
is installed on vehicles manufactured for sale in Can-
ada only. A separate module, mounted on the cowl,
controls the DRL.
OPERATION
The headlamps are illuminated when the ignition
switch is turned to the ON position. The DRL module
receives a vehicle-moving signal from the vehicle
speed
sensor.
This
provides
a
constant
head-
lamps-on condition as long as the vehicle is moving.
The lamps are illuminated at less than 50 percent of
normal intensity.
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.
8L - 2
LAMPS
XJ
DESCRIPTION AND OPERATION (Continued)
LAMP DIAGNOSIS
TABLE OF CONTENTS
page
page
DIAGNOSIS AND TESTING
DIAGNOSTIC PROCEDURES . . . . . . . . . . . . . . . . 3
SYSTEM DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . 3
DIAGNOSIS AND TESTING
DIAGNOSTIC PROCEDURES
When a vehicle experiences problems with the
headlamp system, verify the condition of the battery
connections, fuses, charging system, headlamp bulbs,
wire connectors, relay, high beam switch, dimmer
switch, and headlamp switch. Refer to Group 8W,
Wiring Diagrams for component locations and circuit
information.
SYSTEM DIAGNOSIS
HEADLAMP
Always begin any diagnosis by testing all of the
fuses and circuit breakers in the system. Refer to
Group 8W, Wiring Diagrams.
Conventional and halogen headlamps are inter-
changeable. It is recommended that they not be
intermixed on a given vehicle.
CONDITION
POSSIBLE CAUSES
CORRECTION
HEADLAMPS ARE DIM
WITH ENGINE IDLING
1. Loose or corroded battery cables.
1. Clean and secure battery cable clamps
and posts.
OR IGNITION TURNED
OFF
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. Both headlamp bulbs defective.
7. Replace both headlamp bulbs.
HEADLAMP BULBS BURN
OUT
1. Charging system output too high.
1. Test and repair charging system, refer to
Group 8A.
FREQUENTLY
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
1. Charging system output too low.
1. Test and repair charging system, refer to
Group 8A.
ABOVE IDLE*
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. Both headlamp bulbs defective.
4. Replace both headlamp bulbs.
XJ
LAMPS
8L - 3
CONDITION
POSSIBLE CAUSES
CORRECTION
HEADLAMPS 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 headlamp
circuit.
2. Test amperage draw of headlamp circuit.
Should not exceed 30 amps.
3. Faulty headlamp switch.
3. Replace headlamp switch. Refer to
Group 8E.
4. Loose or corroded terminals or
splices in circuit.
4. Inspect and repair all connectors and
splices, refer to Group 8W.
HEADLAMPS DO NOT
ILLUMINATE
1. 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. Refer to
Group 8E.
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.
*Canada vehicles must have lamps ON.
FOG LAMP
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 FREQUENTLY
1. 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 IDLE
1. 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.
8L - 4
LAMPS
XJ
DIAGNOSIS AND TESTING (Continued)
CONDITION
POSSIBLE CAUSES
CORRECTION
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.
HEADLAMP DELAY MODULE
DELAY FUNCTION INOPERATIVE
(1) Ensure headlamps operate before proceeding.
(2) Remove, inspect and test the HDLP delay 10
amp fuse in junction box. Replace if defective.
(3) With the key off and the connector discon-
nected, measure the resistance from the delay mod-
ule connector, terminal 4 to vehicle body ground. The
ohmmeter should indicate zero ohms. If not, repair
the open circuit in the wire harness to vehicle body
ground.
(4) With the key on measure the voltage between
the delay module connector, terminal 8 and vehicle
body ground. The voltmeter should indicate battery
voltage. If not, repair the open circuit in the wire
harness from ignition switch to HDLP delay module.
(5) Turn headlamps on and measure voltage at
delay module connector, terminal 6. The voltmeter
should indicate battery voltage. If not repair open cir-
cuit between L2 and HDLP delay module.
(6) Measure the voltage between the delay module
connector, terminal 2 and vehicle body ground. The
voltmeter should indicate battery voltage. If not,
repair the open circuit in the wire harness to the
HDLP fuse in the PDC.
(7) If steps 1 through 6 prove out good, replace
headlamp delay module.
XJ
LAMPS
8L - 5
DIAGNOSIS AND TESTING (Continued)
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