Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 2000 XJ Jeep Cherokee exj_8l

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XJ                                                                                                                   LAMPS         8L - 1



                                                             LAMPS
                                                   TABLE OF CONTENTS

                                                             page                                                                   page

LAMP SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 1   LAMP SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
LAMP DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . 3     LAMP SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . 19
HEADLAMP ALIGNMENT . . . . . . . . . . . . . . . . . . . . 6           BULB APPLICATION . . . . . . . . . . . . . . . . . . . . . . . 20
LAMP BULB SERVICE . . . . . . . . . . . . . . . . . . . . . 10



                                                   LAMP SYSTEMS

                                                        TABLE OF CONTENTS
                                                             page                                                                   page

DESCRIPTION AND OPERATION                                                SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . 2
 LAMP SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION                                              instrument cluster illumination. The headlamp
                                                                       switch also contains a rheostat for controlling the
LAMP SYSTEMS                                                           illumination level of the instrument cluster lamps.
  Each vehicle is equipped with various lamp assem-
                                                                       OPERATION
blies. A good ground is necessary for proper lighting
operation. Grounding is provided through a separate                      The headlamp switch has an off position, a parking
ground wire.                                                           lamp position, and a headlamp on position. High
  When changing lamp bulbs check the socket for                        beams are controlled by the multifunction switch on
corrosion. If corrosion is present, clean it with a wire               the steering column. The headlamp switch cannot be
brush and coat the inside of the socket lightly with                   repaired. It must be replaced. Refer to Group 8E for
Mopar Multi-Purpose Grease or equivalent.                              removal and installation procedures, and Group 8W
                                                                       for wiring.
HEADLAMPS
                                                                       SENTINEL HEADLAMP DELAY MODULE
DESCRIPTION
                                                                       DESCRIPTION
  Headlamps on the Cherokee are sealed beam units.
Each module contains a low beam filament and a                           The Headlamp Module delays the de-activation of
high beam filament.                                                    the headlamps for 45  15 seconds after the ignition
                                                                       switch is turned OFF.
OPERATION
                                                                       OPERATION
  The headlamps are controlled by the headlamp
switch and the high beams by the multifunction                            The driver engages the module by turning the igni-
switch. Each headlamp unit can be serviced individ-                    tion switch OFF, then turning the headlamps OFF.
ually.                                                                 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
                                                                       DESCRIPTION
  The headlamp switch is located on the instrument
panel. The headlamp switch controls the parking                          The rear tail lamp modules contains three bulbs, a
lamps, the headlamps, the interior lamps, and                          lens, and a housing. One bulb is a two filament bulb
8L - 2   LAMPS                                                                                            XJ
DESCRIPTION AND OPERATION (Continued)
used for tail light and stop lamp functions. One sin-    ada only. A separate module, mounted on the cowl,
gle filament bulb is for turn signal functions. The      controls the DRL.
other bulb is a single filament bulb used for back-up
light illumination.                                      OPERATION
                                                           The headlamps are illuminated when the ignition
OPERATION                                                switch is turned to the ON position. The DRL module
  Each tail lamp module can be serviced separately.      receives a vehicle-moving signal from the vehicle
Each bulb can also be serviced separately. The head-     speed sensor. This provides a constant head-
lamp switch controls tail lamp operation. The multi-     lamps-on condition as long as the vehicle is moving.
function switch on the steering column controls turn     The lamps are illuminated at less than 50 percent of
signal operation, and the back-up light switch con-      normal intensity.
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                                              SONAL INJURY CAN RESULT.
  The front turn signal and parking lamp module
contains a housing, a lens, and two bulbs.
                                                         CAUTION: Do not touch the glass of halogen bulbs
OPERATION                                                with fingers or other possibly oily surface, reduced
  The parking lamp function is controlled by the         bulb life will result.
headlamp switch. The turn signal function is con-          Do not use bulbs with higher candle power than
trolled by the multifunction switch on the steering      indicated in the Bulb Application table at the end of
column. Each bulb can be serviced separately.            this group. Damage to lamp and/or Daytime Run-
                                                         ning Lamp Module can result.
CHMSL (CENTER HIGH MOUNTED STOP LAMP)                      Do not use fuses, circuit breakers or relays hav-
                                                         ing greater amperage value than indicated on the
DESCRIPTION                                              fuse panel or in the Owners Manual.
  The center high mounted stop lamp (CHMSL) is
                                                           When it is necessary to remove components to ser-
mounted on the liftgate. The module consists of a
                                                         vice another, it should not be necessary to apply
housing, a lens, and a single filament bulb.
                                                         excessive force or bend a component to remove it.
OPERATION                                                Before damaging a trim component, verify hidden
  The CHMSL is controlled by the brake lamp              fasteners or captured edges are not holding the com-
switch.                                                  ponent in place.

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                                           SYSTEM DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . 3
  DIAGNOSTIC PROCEDURES . . . . . . . . . . . . . . . . 3

DIAGNOSIS AND TESTING                                         SYSTEM DIAGNOSIS
DIAGNOSTIC PROCEDURES                                         HEADLAMP
  When a vehicle experiences problems with the                  Always begin any diagnosis by testing all of the
headlamp system, verify the condition of the battery          fuses and circuit breakers in the system. Refer to
connections, fuses, charging system, headlamp bulbs,          Group 8W, Wiring Diagrams.
wire connectors, relay, high beam switch, dimmer                Conventional and halogen headlamps are inter-
switch, and headlamp switch. Refer to Group 8W,               changeable. It is recommended that they not be
Wiring Diagrams for component locations and circuit           intermixed on a given vehicle.
information.

        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.
8L - 4    LAMPS                                                                                                   XJ
DIAGNOSIS AND TESTING (Continued)

         CONDITION                 POSSIBLE CAUSES                                  CORRECTION

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. Refer to
                                                                     Group 8E.
                           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. Refer to
                                                                     Group 8E.
                           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.


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.
XJ                                                                                                LAMPS       8L - 5
DIAGNOSIS AND TESTING (Continued)

        CONDITION                    POSSIBLE CAUSES                                 CORRECTION

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.


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.
8L - 6      LAMPS                                                                                                                XJ


                                          HEADLAMP ALIGNMENT

                                                         TABLE OF CONTENTS
                                                               page                                                             page

SERVICE PROCEDURES                                                        HEADLAMP ADJUSTMENT . . . . . . . . . . . . . . . . . . 6
 HEADLAMP ALIGNMENT . . . . . . . . . . . . . . . . . . . . 6             FOG LAMP ADJUSTMENT . . . . . . . . . . . . . . . . . . . 8
 LAMP ALIGNMENT SCREEN PREPARATION . . . . . 6                           SPECIAL TOOLS
 VEHICLE PREPARATION FOR HEADLAMP                                         HEADLAMP ALIGNMENT . . . . . . . . . . . . . . . . . . . . 9
   ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SERVICE PROCEDURES                                                         (6) Fuel tank should be FULL. Add 2.94 kg (6.5
                                                                         lbs.) of weight over the fuel tank for each estimated
HEADLAMP ALIGNMENT                                                       gallon of missing fuel.
  Headlamps can be aligned using the screen method
provided in this section. Alignment Tool C-4466-A or                     HEADLAMP ADJUSTMENT
equivalent can also be used. Refer to instructions                          Headlamps can be aligned using the screen
provided with the tool for proper procedures.                            method. The Headlamp Alignment Tool C-4466-A or
                                                                         equivalent can also be used. Refer to instructions
LAMP ALIGNMENT SCREEN PREPARATION                                        provided with the tool for proper procedures.
   (1) Position vehicle on a level surface perpendicu-                      A properly aimed low beam will project the top
lar to a flat wall 7.62 meters (25 ft) away from front                   edge of the beam intensity pattern on the screen
of headlamp lens (Fig. 1).                                               from 25 mm (1 in.) above to 75 mm (3 in.) below
   (2) If necessary, tape a line on the floor 7.62                       headlamp centerline. The side-to-side left edge of the
meters (25 ft) away from and parallel to the wall.                       beam intensity pattern should be from 50 mm (2 in.)
   (3) Measure from the floor up 1.27 meters (5 ft)                      left to 50 mm (2 in.) right of headlamp centerline
and tape a line on the wall at the centerline of the                     (Fig. 2).
vehicle. Sight along the centerline of the vehicle                          (1) Remove screws and both headlamp bezels.
(from rear of vehicle forward) to verify accuracy of                        (2) Clean front of the headlamps.
the line placement.                                                         (3) Place headlamps on LOW beam.
   (4) Rock vehicle side-to-side three times to allow                       (4) Cover front of the headlamp that is not being
suspension to stabilize.                                                 adjusted.
   (5) Jounce front suspension three times by pushing                       (5) Turn vertical adjustment screw (Fig. 3) until
downward on front bumper and releasing.                                  the headlamp beam pattern on screen/wall is similar
   (6) Measure the distance from the center of head-                     to the pattern depicted in the alignment screen fig-
lamp lens to the floor. Transfer measurement to the                      ure.
alignment screen (with tape). Use this line for
                                                                         NOTE: When using a headlamp aiming screen,
up/down adjustment reference.
                                                                         adjust the headlamps so that:
   (7) Measure distance from the centerline of the
vehicle to the center of each headlamp being aligned.                      



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