exj 8l, JEEP Manuals, Electronic Service Manual (jeep cherokee xj do 2000)
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XJ
LAMPS
8L - 1
LAMPS
TABLE OF CONTENTS
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page
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3
6
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4
9
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LAMP SYSTEMS
TABLE OF CONTENTS
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DESCRIPTION AND OPERATION
DESCRIPTION AND OPERATION
instrument cluster illumination. The headlamp
switch also contains a rheostat for controlling the
illumination level of the instrument cluster lamps.
LAMP SYSTEMS
Each vehicle is equipped with various lamp assem-
blies. A good ground is necessary for proper lighting
operation. Grounding is provided through a separate
ground wire.
When changing lamp bulbs check the socket for
corrosion. If corrosion is present, clean it with a wire
brush and coat the inside of the socket lightly with
Mopar
OPERATION
The headlamp switch has an off position, a parking
lamp position, and a headlamp on position. High
beams are controlled by the multifunction switch on
the steering column. The headlamp switch cannot be
repaired. It must be replaced. Refer to Group 8E for
removal and installation procedures, and Group 8W
for wiring.
t
Multi-Purpose Grease or equivalent.
HEADLAMPS
SENTINEL HEADLAMP DELAY MODULE
DESCRIPTION
Headlamps on the Cherokee are sealed beam units.
Each module contains a low beam filament and a
high beam filament.
DESCRIPTION
The Headlamp Module delays the de-activation of
the headlamps for 45
6
15 seconds after the ignition
switch is turned OFF.
OPERATION
The headlamps are controlled by the headlamp
switch and the high beams by the multifunction
switch. Each headlamp unit can be serviced individ-
ually.
OPERATION
The driver engages the module by turning the igni-
tion switch OFF, then turning the headlamps OFF.
The module is mounted to a bracket attached to the
inside of the instrument panel.
HEADLAMP SWITCH
TAIL/TURN SIGNAL/STOP/BACK-UP LAMP
DESCRIPTION
The headlamp switch is located on the instrument
panel.
DESCRIPTION
The rear tail lamp modules contains three bulbs, a
lens, and a housing. One bulb is a two filament bulb
The
headlamp
switch
controls
the
parking
lamps,
the
headlamps,
the
interior
lamps,
and
 8L - 2
LAMPS
XJ
DESCRIPTION AND OPERATION (Continued)
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.
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.
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.
SAFETY PRECAUTIONS
FRONT TURN SIGNAL/PARKING LAMP
WARNING: EYE PROTECTION SHOULD BE USED
WHEN
SERVICING
GLASS
COMPONENTS.
PER-
DESCRIPTION
The front turn signal and parking lamp module
contains a housing, a lens, and two bulbs.
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.
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.
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.
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-
 XJ
LAMPS
8L - 3
LAMP DIAGNOSIS
TABLE OF CONTENTS
page
page
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING
SYSTEM DIAGNOSIS
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.
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.
 8L - 4
LAMPS
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DIAGNOSIS AND TESTING (Continued)
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.
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LAMPS
8L - 5
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
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.
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
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