Jeep Liberty KJ. Manual - part 103

REMOVAL

WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, occupant classification sys-
tem, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect
and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge
before performing further diagnosis or service. This is the only sure way to disable the supplemental
restraint system. Failure to take the proper precautions could result in accidental airbag deployment.

NOTE: The headlamp high beam relay is installed in the Junction Block (JB) on the driver side outboard
end of the instrument panel. Vehicles equipped with a Daytime Running Lamps (DRL) relay MUST NOT have
a headlamp high beam relay installed in the JB.

1. Disconnect and isolate the battery negative cable.

2. Remove the trim from the driver side end of the

instrument panel. (Refer to 23 - BODY/INSTRU-
MENT PANEL/INSTRUMENT PANEL END CAP -
REMOVAL).

3. Remove the high beam relay by grasping it firmly

and pulling it straight out from the receptacle (2) in
the Junction Block (JB).

INSTALLATION

1. Position the headlamp high beam relay to the

proper receptacle (2) in the Junction Block (JB).

2. Align the high beam relay terminals with the cavi-

ties in the JB receptacle.

3. Push firmly and evenly on the top of the high beam

relay until the relay base is fully seated in the JB
receptacle.

4. Reinstall the trim onto the driver side outboard end

of the instrument panel. (Refer to 23 - BODY/IN-
STRUMENT PANEL/INSTRUMENT PANEL END
CAP - INSTALLATION).

5. Reconnect the battery negative cable.

8L - 70

LAMPS/LIGHTING - EXTERIOR

HEADLAMP LEVELING MOTOR

DESCRIPTION

The headlamp leveling motor (1) is located on the rear
inboard side of each headlamp unit (5) on vehicles
equipped with the headlamp leveling system, which is
available only in certain markets where required. The
motor is encased within a molded plastic housing and
is secured by an integral wedge-type mounting boss
to a keyed flange on the back of the headlamp unit
housing. A rubber seal around the circumference of
the mounting boss seals the motor to the headlamp.

The outside of the motor housing features an integral
molded connector on its rearward surface, a hex-
headed adjusting screw extends from the top of the
housing, and a plastic pushrod with a ball formation
on its free end extends from the motor mounting boss.
Within the motor housing is a 12-volt Direct Current
(DC) servo motor, an electronic controller board that
includes the motor logic circuits, and an integral
screw-drive transmission. The headlamp leveling motor is connected to the vehicle electrical system through a ded-
icated take out and connector of the front fascia wire harness.

The headlamp leveling motor is serviced as a unit with the headlamp unit. The motor cannot be repaired and, if
inoperative or damaged, the entire headlamp unit must be replaced.

OPERATION

The controller board and logic circuitry of the headlamp leveling motor control motor operation based upon a voltage
signal input received from the resistor multiplexed headlamp leveling switch on the instrument panel. When the
motor is energized it will extend or retract the motor pushrod through the integral screw-drive transmission. The ball
on the end of the pushrod is snapped into a socket on the back of the reflector within the headlamp unit housing,
which will cause the reflector to move as the pushrod is extended or retracted, changing the angle at which the light
is projected from the headlamps.

The headlamp leveling motors and switch have a path to ground at all times. The headlamp leveling components
operate on battery voltage received through the fused park lamp relay output circuit so that the system will only
operate when the exterior lighting is turned On.

Because of active electronic elements within the headlamp leveling motor, it cannot be tested using conventional
diagnostic tools and procedures. If the headlamp leveling system is believed to be inoperative, the headlamp lev-
eling circuits and the leveling switch must be tested before considering motor replacement.

LAMPS/LIGHTING - EXTERIOR

8L - 71

HEADLAMP LEVELING SWITCH

DESCRIPTION

The headlamp leveling switch (1) is used only on vehi-
cles manufactured for certain markets where the
headlamp leveling system is required. The headlamp
leveling switch is mounted in the driver side inboard
trim bezel on the instrument panel. Only the switch
bezel and thumbwheel (5) are visible on the outer sur-
face of the instrument panel trim bezel. The black
plastic switch thumbwheel is marked with white num-
bers “0,” “1,” “2,” and “3,” each of which indicates one
of the four switch detent positions. Each higher num-
ber represents a lower aiming position of the head-
lamp beam relative to the road surface.

The black, molded plastic switch housing encloses the switch thumbwheel mechanism and the leveling switch cir-
cuitry including the switch contacts and a series resistor configuration. A connector receptacle (3) is integral to the
back of the switch housing, while a single integral latch feature (2) on the top of the housing and two latch features
(4) on the bottom of the housing secure the switch in the instrument panel trim bezel. The switch is connected to
the vehicle electrical system through a dedicated take out and connector of the instrument panel wire harness.

The headlamp leveling switch cannot be adjusted or repaired and, if inoperative or damaged, the unit must be
replaced.

OPERATION

The headlamp leveling switch receives battery voltage on a fused park lamp relay output circuit from a fuse in the
Junction Block (JB) whenever the park lamps relay is energized (the park lamps are turned On). The switch
receives a path to ground through a splice block in the instrument panel wire harness secured by a nut to a ground
stud on the driver side instrument panel end bracket near the JB.

The only output from the switch is a voltage signal that it provides to the headlamp leveling motors on a headlamp
adjust signal circuit. Each switch position selects a different tap on a series resistor within the switch to provide a
different voltage signal to the leveling motors. The higher the switch position number, the higher the output voltage
level.

The headlamp leveling switch can be tested using conventional diagnostic tools and methods.

8L - 72

LAMPS/LIGHTING - EXTERIOR

DIAGNOSIS AND TESTING

HEADLAMP LEVELING SWITCH

1. Disconnect and isolate the battery negative cable.

2. Disconnect the instrument panel wire harness con-

nector from the headlamp leveling switch.

3. Using an ohmmeter, perform the resistance tests at

the terminal pins in the headlamp leveling switch
connector receptacle as shown in the Headlamp
Leveling Switch Tests table.

HEADLAMP LEVELING SWITCH TESTS

SWITCH POSITION

RESISTANCE (OHMS) BETWEEN PINS 1 AND 3

0.5 ± 0.5

301 ± 1

595 ± 1

739 ± 1

4. If the switch fails any of the resistance tests, replace the inoperative headlamp leveling switch as required.

REMOVAL

NOTE: A headlamp leveling switch is used only on vehicles manufactured for certain markets where head-
lamp leveling is required.

1. Disconnect and isolate the battery negative cable.

2. Remove the driver side inboard bezel (4) from the

instrument panel. (Refer to 23 - BODY/INSTRU-
MENT

PANEL/INSTRUMENT

PANEL

DRIVER

SIDE BEZEL - REMOVAL).

3. Disconnect the instrument panel wire harness con-

nector from the headlamp leveling switch connector
receptacle (3).

4. From the back of the trim bezel, depress the two

lower latch features (5) on the switch housing and
rock the bottom of the switch out through the face
of the bezel.

LAMPS/LIGHTING - EXTERIOR

8L - 73

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