Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 1999 XJ Jeep Cherokee EXJ_8L
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XJ LAMPS 8L - 1
LAMPS
CONTENTS
page page
BULB APPLICATION . . . . . . . . . . . . . . . . . . . . . . 18 LAMP DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . 1
HEADLAMP ALIGNMENT . . . . . . . . . . . . . . . . . . . 5 LAMP SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . 12
LAMP BULB SERVICE . . . . . . . . . . . . . . . . . . . . . 8 LAMP SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . 16
LAMP DIAGNOSIS
INDEX
page page
GENERAL INFORMATION DIAGNOSIS AND TESTING
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1 DIAGNOSTIC PROCEDURES . . . . . . . . . . . . . . . . 1
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . 1 SYSTEM DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL INFORMATION When it is necessary to remove components to ser-
vice another, it should not be necessary to apply
GENERAL INFORMATION excessive force or bend a component to remove it.
Each vehicle is equipped with various lamp assem- Before damaging a trim component, verify hidden
blies. A good ground is necessary for proper lighting fasteners or captured edges are not holding the com-
operation. Grounding is provided by the lamp socket ponent in place.
when it comes in contact with the metal body, or
through a separate ground wire. DIAGNOSIS AND TESTING
When changing lamp bulbs check the socket for
corrosion. If corrosion is present, clean it with a wire
DIAGNOSTIC PROCEDURES
brush and coat the inside of the socket lightly with
When a vehicle experiences problems with the
Mopar Multi-Purpose Grease or equivalent.
headlamp system, verify the condition of the battery
connections, fuses, charging system, headlamp bulbs,
SAFETY PRECAUTIONS wire connectors, relay, high beam switch, dimmer
WARNING: EYE PROTECTION SHOULD BE USED switch, and headlamp switch. Refer to Group 8W,
WHEN SERVICING GLASS COMPONENTS. PER- Wiring Diagrams for component locations and circuit
SONAL INJURY CAN RESULT. information.
SYSTEM DIAGNOSIS
CAUTION: Do not touch the glass of halogen bulbs
with fingers or other possibly oily surface, reduced HEADLAMP
bulb life will result. Always begin any diagnosis by testing all of the
Do not use bulbs with higher candle power than fuses and circuit breakers in the system. Refer to
indicated in the Bulb Application table at the end of Group 8W, Wiring Diagrams.
this group. Damage to lamp and/or Daytime Run- Conventional and halogen headlamps are inter-
ning Lamp Module can result. changeable. It is recommended that they not be
Do not use fuses, circuit breakers or relays hav- intermixed on a given vehicle.
ing greater amperage value than indicated on the
fuse panel or in the Owners Manual.
8L - 2 LAMPS XJ
DIAGNOSIS AND TESTING (Continued)
CONDITION POSSIBLE CAUSES CORRECTION
HEADLAMPS ARE DIM 1. Loose or corroded battery cables. 1. Clean and secure battery cable clamps
WITH ENGINE IDLING and posts.
OR IGNITION TURNED 2. Loose or worn generator drive 2. Adjust or replace generator drive belt.
OFF 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 1. Charging system output too high. 1. Test and repair charging system, refer to
OUT Group 8A.
FREQUENTLY 2. Loose or corroded terminals or 2. Inspect and repair all connectors and
splices in circuit. splices, refer to Group 8W.
HEADLAMPS ARE DIM 1. Charging system output too low. 1. Test and repair charging system, refer to
WITH ENGINE RUNNING 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 3. Test amperage draw of headlamp circuit.
circuit.
4. Both headlamp bulbs defective. 4. Replace both headlamp bulbs.
HEADLAMPS FLASH 1. Poor lighting circuit Z1-ground. 1. Test for voltage drop across Z1-ground
RANDOMLY locations, refer to Group 8W.
2. High resistance in headlamp 2. Test amperage draw of headlamp circuit.
circuit. Should not exceed 30 amps.
3. Faulty headlamp switch. 3. Replace headlamp switch.
4. Loose or corroded terminals or 4. Inspect and repair all connectors and
splices in circuit. splices, refer to Group 8W.
HEADLAMPS DO NOT 1. No voltage to headlamps. 1. Repair open headlamp circuit, refer to
ILLUMINATE 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 4. Replace multi-function switch.
(multi-function) switch.
5. Broken connector terminal or wire 5. Repair connector terminal or wire splice.
splice in headlamp circuit.
*Canada vehicles must have lamps ON.
XJ LAMPS 8L - 3
DIAGNOSIS AND TESTING (Continued)
FOG LAMP
CONDITION POSSIBLE CAUSES CORRECTION
FOG LAMPS ARE DIM 1. Loose or corroded battery cables. 1. Clean and secure battery cable clamps
WITH ENGINE IDLING OR and posts.
IGNITION TURNED OFF. 2. Loose or worn generator drive 2. Adjust or replace generator drive belt.
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 1. Charging system output too high. 1. Test and repair charging system. Refer to
OUT FREQUENTLY Group 8A.
2. Loose or corroded terminals or 2. Inspect and repair all connectors and
splices in circuit. splices. Refer to Group 8W.
FOG LAMPS ARE DIM 1. Charging system output too low. 1. Test and repair charging system. Refer to
WITH ENGINE RUNNING 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 fog lamp circuit. 3. Test amperage draw of fog lamp circuit.
FOG LAMPS FLASH 1. Poor lighting circuit Z1-ground. 1. Test for voltage drop across Z1-ground
RANDOMLY 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 4. Inspect and repair all connectors and
splices in circuit. splices. Refer to Group 8W.
FOG LAMPS DO NOT 1. Blown fuse for fog lamp. 1. Replace fuse. Refer to Group 8W.
ILLUMINATE 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 4. Repair connector terminal or wire splice.
splice in fog lamp circuit.
5. Defective or burned out bulb. 5. Replace bulb.
8L - 4 LAMPS XJ
DIAGNOSIS AND TESTING (Continued)
HEADLAMP DELAY MODULE body ground. The voltmeter should indicate battery
voltage. If not, repair the open circuit in the wire
DELAY FUNCTION INOPERATIVE harness from ignition switch to HDLP delay module.
(1) Ensure headlamps operate before proceeding. (5) Turn headlamps on and measure voltage at
(2) Remove, inspect and test the HDLP delay 10 delay module connector, terminal 6. The voltmeter
amp fuse in junction box. Replace if defective. should indicate battery voltage. If not repair open cir-
(3) With the key off and the connector discon- cuit between L2 and HDLP delay module.
nected, measure the resistance from the delay mod- (6) Measure the voltage between the delay module
ule connector, terminal 4 to vehicle body ground. The connector, terminal 2 and vehicle body ground. The
ohmmeter should indicate zero ohms. If not, repair voltmeter should indicate battery voltage. If not,
the open circuit in the wire harness to vehicle body repair the open circuit in the wire harness to the
ground. HDLP fuse in the PDC.
(4) With the key on measure the voltage between (7) If steps 1 through 6 prove out good, replace
the delay module connector, terminal 8 and vehicle headlamp delay module.
XJ LAMPS 8L - 5
HEADLAMP ALIGNMENT
INDEX
page page
GENERAL INFORMATION LAMP ALIGNMENT SCREEN PREPARATION . . . . 5
HEADLAMP ALIGNMENT . . . . . . . . . . . . . . . . . . . 5 VEHICLE PREPARATION FOR HEADLAMP
SERVICE PROCEDURES ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
FOG LAMP ADJUSTMENT . . . . . . . . . . . . . . . . . . 6 SPECIAL TOOLS
HEADLAMP ADJUSTMENT . . . . . . . . . . . . . . . . . 6 HEADLAMP ALIGNMENT . . . . . . . . . . . . . . . . . . . 7
GENERAL INFORMATION (2) If necessary, tape a line on the floor 7.62
meters (25 ft) away from and parallel to the wall.
HEADLAMP ALIGNMENT (3) Measure from the floor up 1.27 meters (5 ft)
Headlamps can be aligned using the screen method and tape a line on the wall at the centerline of the
provided in this section. Alignment Tool C-4466-A or vehicle. Sight along the centerline of the vehicle
equivalent can also be used. Refer to instructions (from rear of vehicle forward) to verify accuracy of
provided with the tool for proper procedures. the line placement.
(4) Rock vehicle side-to-side three times to allow
suspension to stabilize.
SERVICE PROCEDURES (5) Jounce front suspension three times by pushing
downward on front bumper and releasing.
LAMP ALIGNMENT SCREEN PREPARATION (6) Measure the distance from the center of head-
(1) Position vehicle on a level surface perpendicu- lamp lens to the floor. Transfer measurement to the
lar to a flat wall 7.62 meters (25 ft) away from front alignment screen (with tape). Use this line for
of headlamp lens (Fig. 1). up/down adjustment reference.
Fig. 1 Headlamp Alignment Screen--Typical
8L - 6 LAMPS XJ
SERVICE PROCEDURES (Continued)
(7) Measure distance from the centerline of the within the headlamp the alignment screen target
vehicle to the center of each headlamp being aligned. (Fig. 2).
Transfer measurements to screen (with tape) to each (8) Cover front of headlamp that has been adjusted
side of vehicle centerline. Use these lines for left/ and adjust the other headlamp beam as instructed
right adjustment reference. above.
(9) Install headlamp bezels. Tighten the screws
VEHICLE PREPARATION FOR HEADLAMP securely.
ALIGNMENT
(1) Verify headlamp dimmer switch and high beam
indicator operation.
(2) Correct defective components that could hinder
proper headlamp alignment.
(3) Verify proper tire inflation.
(4) Clean headlamp lenses.
(5) Verify that luggage area is not heavily loaded.
(6) Fuel tank should be FULL. Add 2.94 kg (6.5
lbs.) of weight over the fuel tank for each estimated
gallon of missing fuel.
HEADLAMP ADJUSTMENT
Headlamps can be aligned using the screen
method. The Headlamp Alignment Tool C-4466-A or
equivalent can also be used. Refer to instructions
provided with the tool for proper procedures. Fig. 2 Headlamp Alignment Screen Target
A properly aimed low beam will project the top
edge of the beam intensity pattern on the screen
from 25 mm (1 in.) above to 75 mm (3 in.) below
headlamp centerline. The side-to-side left edge of the
beam intensity pattern should be from 50 mm (2 in.)
left to 50 mm (2 in.) right of headlamp centerline
(Fig. 2).
(1) Remove screws and both headlamp bezels.
(2) Clean front of the headlamps.
(3) Place headlamps on LOW beam.
(4) Cover front of the headlamp that is not being
adjusted.
(5) Turn vertical adjustment screw (Fig. 3) until
the headlamp beam pattern on screen/wall is similar
to the pattern depicted in the alignment screen fig-
ure.
NOTE: When using a headlamp aiming screen, Fig. 3 Headlamp Beam Adjustment Screws
adjust the headlamps so that:
FOG LAMP ADJUSTMENT
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