exj 8la, JEEP Manuals, Electronic Service Manual (jeep cherokee xj do 2000)
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XJ
LAMPS
8L - 1
LAMPS
TABLE OF CONTENTS
page
page
1
3
6
8
1
LAMP DIAGNOSIS
TABLE OF CONTENTS
page
page
DESCRIPTION AND OPERATION
DIAGNOSIS AND TESTING
DESCRIPTION AND OPERATION
HEADLAMP LEVELING MOTOR
DESCRIPTION
Vehicles equipped with a remote headlamp leveling
system use two leveling motors attached to each
headlamp mounting bracket. They are located just
behind
the
headlamp
assemblies
and
must
be
accessed from underneath the vehicle.
OPERATION
This system allows the driver to adjust the vertical
headlamp aim from the interior of the vehicle to com-
pensate for passenger or cargo load. A headlamp lev-
eling switch is located in the instrument panel and
controls the headlamp leveling motor function.
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.
Fig. 1 Headlamp Leveling Motor Position &
Orientation
1 – HEADLAMP LEVELING MOTOR
2 – FRONT STABILIZER BAR
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DIAGNOSIS AND TESTING (Continued)
DIAGNOSIS AND TESTING
HEADLAMP LEVELING MOTOR DIAGNOSIS
CONDITION
POSSIBLE CAUSES
CORRECTION
ONE MOTOR DOES NOT
OPERATE
1. Poor connection at motor.
1. Secure connector on motor.
2. No voltage at motor.
2. Repair circuit. Refer to Group 8W,
Wiring.
3. Defective motor.
3. Replace motor.
BOTH MOTORS DO NOT
OPERATE
1. No voltage at headlamp leveling
switch.
1. Repair circuit or replace fuse. Refer to
Group 8W, Wiring.
2. No voltage at both motors.
2. Repair circuit or replace fuse. Refer to
Group 8W, Wiring.
3. Poor connection at motors.
3. Secure connectors on motors.
4. Both motors defective.
4. Replace motors.
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LAMPS
8L - 3
HEADLAMP AND FOG LAMP ALIGNMENT
TABLE OF CONTENTS
page
page
SERVICE PROCEDURES
ADJUSTMENTS
HEADLAMP/FOG LAMP ADJUSTMENT USING
SERVICE PROCEDURES
(5) Rock vehicle side-to-side three times and allow
suspension to stabilize.
(6) Jounce front suspension three times by pushing
downward on front bumper and releasing.
(7) Measure the distance from the center of head-
lamp lens to the floor. Transfer measurement to the
alignment
HEADLAMP ALIGNMENT PREPARATION
(1) Verify headlamp are on low beam setting.
(2) Verify that the headlamp leveling switch is in
the “0” position.
(3) Inspect and correct damaged or defective com-
ponents that could interfere with proper headlamp
alignment.
(4) Verify proper tire inflation.
(5) Clean headlamp lenses.
(6) Verify that luggage area is loaded as the vehi-
cle is routinely used.
(7) 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.
screen
(with
tape).
Use
this
line
for
up/down adjustment reference.
(8) Place a tape line 130 mm below and parallel to
the center of headlamp line.
(9) Measure distance from the centerline of the
vehicle to the center of each headlamp being aligned.
Transfer measurements to screen (with tape) to each
side of vehicle centerline. Use these lines for left/
right adjustment reference.
HEADLAMP ADJUSTMENT
A properly aimed low beam headlamp will project a
high intensity light pattern on the screen with the
horizontal cut-off line aligned with the tape line 130
mm (5.12 in.) below the headlamp centerline (Fig. 1).
The intersection of the horizontal and 15 degree cut-
off lines in the projected pattern should align to the
intersection of the headlamp centerline vertical tape
line and the tape line 130 mm (5.12 in.) below the
headlamp horizontal centerline. The high beams on a
vehicle with aero headlamps cannot be aligned. The
high beam pattern should be correct when the low
beams are aligned properly.
To adjust headlamp alignment, rotate alignment
screws (Fig. 2) to achieve the specified low beam hot
spot pattern.
ADJUSTMENTS
HEADLAMP/FOG LAMP ADJUSTMENT USING
ALIGNMENT SCREEN
ALIGNMENT SCREEN PREPARATION
(1) Position vehicle on a level surface perpendicu-
lar to a flat wall 10 meters (32.8 ft.) away from front
of headlamp lens (Fig. 1).
(2) Place 75 kg in the driver’s seat to simulate the
ride height of the vehicle when driven.
(3) If necessary, tape a line on the floor 10 meters
(32.8 ft) away from and parallel to the wall.
(4) From the floor up 1.27 meters (5 ft), tape a line
on the wall at the centerline of the vehicle. Sight
along the centerline of the vehicle (from rear of vehi-
cle forward) to verify accuracy of the line placement.
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ADJUSTMENTS (Continued)
Fig. 1 Headlamp Alignment Screen—Typical
1 – CENTER OF VEHICLE
2 – CENTER OF HEADLAMPS
3 – 15° CUT-OFF LINE
4 – FRONT OF HEADLAMP
5 – 10 METERS (32.8 ft.)
6 – HORIZONTAL CUT-OFF LINE
7 – 130mm
FOG LAMP ALIGNMENT
Prepare an alignment screen. Refer to the Align-
ment Screen Preparation paragraph in this section. A
properly aligned fog lamp will project a pattern on
the alignment screen 200 mm (8 in.) below the fog
lamp centerline and straight ahead (Fig. 3). To
improve visual interpretation of the fog lamp pattern
on the alignment screen, disable the headlamps by
disengaging the wire connectors from the headlamp
bulbs.
To adjust fog lamp alignment, rotate alignment
screws (Fig. 4) to achieve the specified pattern.
Fig. 2 Headlamp Beam Adustment Screws
1 – LEFT/RIGHT ADJUSTMENT SCREW
2 – UP/DOWN ADJUSTMENT SCREW
3 – HEADLAMP
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8L - 5
ADJUSTMENTS (Continued)
Fig. 3 Fog Lamp Alignment-Typical
1 – HIGH INTENSITY AREA
2 – CENTER OF VEHICLE
3 – VERTICAL CENTER OF FOG LAMP
4 – HORIZONTAL CENTER OF FOG LAMP
5 – 200mm (8 in.)
6 – FRONT OF FOG LAMP
7 – 10 METERS (32.8 ft.)
Fig. 4 Fog Lamp Beam Adjustment Screws
1 – ADJUSTMENT SCREW
2 – MOUNTING BRACKET
3 – FOG LAMP
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