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Jeep Liberty KJ. Manual - part 98

1. Align the base of the bulb (2) with the socket (3).

2. Push the bulb straight into the socket until the base

is firmly seated.

3. Align the socket and bulb with the keyed opening

on the back of CHMSL housing (1).

4. Insert the socket and bulb into the housing until the

socket is firmly seated.

5. Rotate the socket clockwise about 30 degrees to

lock it into place.

6. Position the CHMSL into the opening in the rear

roof panel.

7. Install and tighten the two screws that secure the

CHMSL to the roof panel. Tighten the screws to 2
N·m (21 in. lbs.).

8. Reconnect the battery negative cable.

LAMP

1. Check to be certain that the two plastic nuts (6) are

properly positioned and in good condition on each
side of the roof panel (1) opening for the Center
High Mounted Stop Lamp (CHMSL) (4).

2. Position the CHMSL near the roof panel opening.

3. Reconnect the wire harness connector (2) to the

CHMSL socket (3).

4. Install and tighten the two screws (5) that secure

the CHMSL to the roof panel. Tighten the screws to
2 N·m (21 in. lbs.).

5. Reconnect the battery negative cable.

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LAMPS/LIGHTING - EXTERIOR

COMBINATION FLASHER

DESCRIPTION

The combination flasher is integral to the hazard
switch unit located behind the hazard switch button (1)
near the center of the instrument panel. The combina-
tion flasher is a smart relay that functions as both the
turn signal system and the hazard warning system
flasher. The combination flasher contains active elec-
tronic Integrated Circuitry (IC) elements.

This flasher is designed to handle the current flow requirements of the factory-installed lighting. If supplemental light-
ing is added to the turn signal lamp circuits, such as when towing a trailer with lights, the combination flasher will
automatically try to compensate to keep the flash rate the same.

The combination flasher cannot be repaired or adjusted and, if inoperative or damaged, the hazard switch unit must
be replaced.

OPERATION

The combination flasher has the following inputs and outputs: fused B(+), fused ignition switch output, right turn
signal sense, left turn signal sense, and one output each for the right and left turn signal circuits. The combination
flasher also receives an internal input through the hazard switch and, on vehicles equipped with the optional Vehicle
Theft Security System (VTSS), receives an input from the Body Control Module (BCM) in order to flash the turn
signal lamps as an optical alert feature of that system.

Battery voltage is supplied to the flasher on a fused B(+) circuit so that the flasher can perform the hazard warning
flasher function, regardless of the ignition switch position. The flasher also receives battery voltage on a separate
fused ignition switch output (run-start) circuit to perform the turn signal flasher function.

The Integrated Circuit (IC) within the combination flasher contains the logic that controls the flasher operation and
the flash rate. The IC receives separate sense ground inputs from the multi-function switch for the right and left turn
signals, and from the hazard switch contacts or the BCM for the hazard warning signals. A special design feature of
the combination flasher allows it to

sense

that a turn signal circuit or bulb is not operating, and provide the driver

an indication of the condition by flashing the remaining bulbs in the affected circuit at a higher rate (120 flashes-
per-minute or higher).

Because of the active electronic elements within the combination flasher, it cannot be tested with conventional auto-
motive electrical test equipment. If the combination flasher is believed to be faulty, test the turn signal and hazard
warning systems before replacing the flasher. If no problems are found, replace the hazard warning switch with a
known good unit to confirm system operation.

LAMPS/LIGHTING - EXTERIOR

8L - 51

DAYTIME RUNNING LAMP RELAY

DESCRIPTION

The Daytime Running Lamp (DRL) relay (1) is a solid
state relay that is used only on vehicles manufactured
for sale in Canada. The DRL relay is installed in the
Junction Block (JB) on the driver side outboard end of
the instrument panel. Vehicles equipped with this relay
do not have a headlamp high beam relay installed in
the JB.

The DRL relay features a die cast aluminum housing that serves to contain the solid state circuitry of the relay as
well as to perform as a heat sink (2). Potting material (3) fills the base of the housing to enclose and protect the
circuitry.

Four male spade terminals (4) exit the base of the relay housing through the potting material to connect the relay
to the vehicle electrical system. These terminals are laid out in a footprint that is similar to that of a conventional
International Standards Organization (ISO) relay; however, a standard ISO relay must never be installed in place of
the DRL relay.

The DRL relay cannot be adjusted or repaired and, if inoperative or damaged, it must be replaced with a new unit.

OPERATION

The Daytime Running Lamps (DRL) relay is a solid state relay that controls the flow of battery current to the high
beam filaments of both headlamp bulbs based upon a duty cycle control input received from the Body Control Mod-
ule (BCM) of vehicles equipped with the DRL feature. By cycling the DRL relay output, the BCM controls the illu-
mination intensity of the high beam filaments. The DRL relay is connected to the vehicle electrical system through
a receptacle in the Junction Block (JB). The inputs and outputs of the DRL relay include:

•

Battery Voltage Input - The DRL relay receives battery voltage on a fused B(+) circuit from a fused B(+) fuse
in the Power Distribution Center (PDC).

•

Ground Input - The DRL relay receives a path to ground through a splice block with an eyelet terminal that is
secured by a nut to a ground stud on the driver side instrument panel end bracket near the JB.

•

Control Input - The DRL relay control input is received from the BCM and/or the momentary optical horn
(flash-to-pass) output of the multi-function switch through a high beam relay control circuit.

•

Control Output - The DRL relay supplies Pulse Width Modulated (PWM) battery voltage to the headlamp high
beam filaments through the high beam relay output circuit.

Because of active electronic elements within the DRL relay, it cannot be diagnosed or tested using conventional
diagnostic tools and procedures. If the DRL relay is believed to be inoperative, test and repair the headlamp system
as necessary. If no problem is found in the headlamp system, replace the DRL relay with a known good unit to
confirm system operation.

The DRL relay cannot be repaired and, if inoperative or damaged, it must be replaced. Refer to the appropriate
wiring information for diagnosis and testing of the DRL relay and for complete exterior lighting wiring diagrams.

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LAMPS/LIGHTING - EXTERIOR

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 DRL relay is installed in the Junction Block (JB) on the driver side outboard end of the instru-
ment panel. Vehicles equipped with this relay MUST NOT have a headlamp high beam relay installed in the
JB. Also, although the terminals of the DRL relay are laid out in a footprint that is similar to that of a con-
ventional International Standards Organization (ISO) relay, a standard ISO relay MUST NEVER be installed in
the place of the DRL relay.

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 Daytime Running Lamp (DRL) relay

(3) by grasping it firmly and pulling it straight out
from the receptacle in the JB.

INSTALLATION

LAMPS/LIGHTING - EXTERIOR

8L - 53

Content .. 96 97 98 99 ..