2002 JEEP LIBERTY headlamp

towards the steering wheel to just before a detent, to
momentarily activate the headlamp optical horn fea-
ture. The high beams will remain illuminated until
the control stalk is released. The multi-function
switch provides a ground output on a high beam
relay control circuit to energize the headlamp high
beam relay (Daytime Running Lamp relay in Cana-
dian vehicles) in the Junction Block (JB) as required.
²Interior Lamps Defeat- The control ring on
the multi-function switch left (lighting) control stalk
is rotated to a full rearward (clockwise) detent to
defeat the illumination of all interior courtesy lamps.
The multi-function switch provides a resistor multi-
plexed output to the Body Control Module (BCM) on
a panel lamps dimmer switch mux circuit, and the
BCM responds by de-energizing its internal courtesy
lamp driver circuit.
²Interior Lamps On- The control ring on the
multi-function switch left (lighting) control stalk is
rotated to a full forward (counterclockwise) detent to
illuminate all interior courtesy lamps. The multi-
function switch provides a resistor multiplexed out-
put to the Body Control Module (BCM) on a panel
lamps dimmer switch mux circuit, and the BCM
responds by energizing its internal courtesy lamp
driver circuit.
²Panel Lamps Dimming- The control ring on
the multi-function switch left (lighting) control stalk
is rotated to one of six minor intermediate detents to
simultaneously select the desired illumination inten-
sity of all adjustable instrument panel and instru-
ment cluster lighting. The control ring is rotated
rearward (clockwise) to dim, or forward (counter-
clockwise) to brighten. The multi-function switch pro-
vides a resistor multiplexed output to the Body
Control Module (BCM) on a panel lamps dimmer
switch mux circuit, and the BCM responds by send-
ing an electronic panel lamps dimming level message
to the ElectroMechanical Instrument Cluster (EMIC)
over the Programmable Communications Interface
(PCI) data bus. The EMIC electronic circuitry then
provides the proper PWM output to the cluster illu-
mination lamps and the VFD on the EMIC circuit
board, then provides a matching PWM output on the
hard wired fused panel lamps dimmer switch signal
circuit.
²Parade Mode- The control ring on the multi-
function switch left (lighting) control stalk is rotated
to an intermediate detent that is one detent rear-
ward (clockwise) from the full forward (counterclock-
wise) detent to select the Parade mode. The multi-
function switch provides a resistor multiplexed
output to the Body Control Module (BCM) on a panel
lamps dimmer switch mux circuit, and the BCM
responds by sending an electronic panel lamps dim-
ming level message to the ElectroMechanical Instru-ment Cluster (EMIC) over the Programmable
Communications Interface (PCI) data bus. The EMIC
electronic circuitry then provides the proper PWM
output to the cluster illumination lamps and the
VFD on the EMIC circuit board, then provides a
matching PWM output on the hard wired fused panel
lamps dimmer switch signal circuit to illuminate all
lamps at full (daylight) intensity with the exterior
lamps turned On.
²Park Lamps- The control knob on the end of
the multi-function switch left (lighting) control stalk
is rotated forward (counterclockwise) to its first
detent from the Off position to activate the park
lamps. The multi-function switch provides a resistor
multiplexed output to the Body Control Module
(BCM) on a headlamp switch sense circuit, and the
BCM responds by energizing or de-energizing the
park lamp relay in the Junction Block (JB) as
required.
²Rear Fog Lamps- For vehicles so equipped,
the control knob on the end of the multi-function
switch left (lighting) control stalk is rotated forward
(counterclockwise) to its third detent position to acti-
vate the rear fog lamps. The multi-function switch
provides a resistor multiplexed output to the Body
Control Module (BCM) on a headlamp switch sense
circuit, and the BCM responds by energizing or de-
energizing the rear fog lamp relay in the Junction
Block (JB) as required. Rear fog lamps are optional
only for vehicles manufactured for certain markets,
where they are required.
²Turn Signal Control- The left (lighting) con-
trol stalk of the multi-function switch is moved
upward to activate the right turn signal circuitry,
and, downward to activate the left turn signal cir-
cuitry. The turn signal switch has a detent position
in each direction that provides turn signals with
automatic cancellation, and an intermediate, momen-
tary position in each direction that provides turn sig-
nals only until the left multi-function switch control
stalk is released. When the control stalk is moved to
a turn signal switch detent position, the cancel
actuator extends toward the center of the steering
column. A turn signal cancel cam that is integral to
the clockspring rotates with the steering wheel and
the cam lobes contact the cancel actuator when it is
extended from the left multi-function switch. When
the steering wheel is rotated during a turning
maneuver, one of the two turn signal cancel cam
lobes will contact the turn signal cancel actuator. The
cancel actuator latches against the cancel cam rota-
tion in the direction opposite that which is signaled.
In other words, if the left turn signal detent is
selected, the lobes of the cancel cam will ratchet past
the cancel actuator when the steering wheel is
rotated to the left, but will unlatch the cancel actua-
KJLAMPS/LIGHTING - EXTERIOR 8L - 49
MULTI-FUNCTION SWITCH (Continued)

MULTI-FUNCTION SWITCH TESTS
EXTERIOR LIGHTING FUNCTIONS
SWITCH POSITION CONNECTOR C-1 PINS RESISTANCE (OHMS)  10%
Off 4 & 5 3781
Park Lamps On 4 & 5 911
Headlamp Low Beams On 4 & 5 349
Rear Fog Lamps On 4 & 5 75
Headlamp High Beams On 8 & 9 0 - 1
Front Fog Lamps On 2 & 4 0 - 1
Optical Horn (Flash-to-Pass) On 7 & 8 0 - 1
Turn Signal Neutral 6 & 8,8&10Infinite (Open)
Turn Signal Left 6 & 8 0 - 1
Turn Signal Right 8 & 10 0 - 1
INTERIOR LIGHTING FUNCTIONS
SWITCH POSITION CONNECTOR C-1 PINS RESISTANCE (OHMS)  10%
Off (Courtesy Disable) 1 & 4 63
Dimming 1 1 & 4 200
Dimming 2 1 & 4 557
Dimming 3 1 & 4 914
Dimming 4 1 & 4 1271
Dimming 5 1 & 4 1628
Dimming 6 1 & 4 1985
Parade Mode On 1 & 4 3565
Courtesy On 1 & 4 7885
FRONT WIPER FUNCTIONS
SWITCH POSITIONCONNECTOR C-1 & C-2
PINSRESISTANCE (OHMS)  10%
Front Wiper Off C-1 Pin 4 & C-2 Pin 4 4587
Delay 1 C-1 Pin 4 & C-2 Pin 4 1267
Delay 2 C-1 Pin 4 & C-2 Pin 4 792
Delay 3 C-1 Pin 4 & C-2 Pin 4 531
Delay 4 C-1 Pin 4 & C-2 Pin 4 369
Delay 5 C-1 Pin 4 & C-2 Pin 4 262
Front Wiper Low C-1 Pin 4 & C-2 Pin 4 125
Front Wiper High C-1 Pin 4 & C-2 Pin 4 38
Front Wiper Mist C-1 Pin 4 & C-2 Pin 4 125
Front Washer On C-2 Pins5&7 0-1
REAR WIPER FUNCTIONS
SWITCH POSITION CONNECTOR C-2 PINS RESISTANCE (OHMS)  10%
Rear Wiper Off 1 & 5,2&5Infinite (Open)
Rear Wiper Intermittent 2 & 5 0 - 1
Rear Wiper On 1 & 5 0 - 1
Rear Washer On 2 & 5,3&5 0-1
8L - 52 LAMPS/LIGHTING - EXTERIORKJ
MULTI-FUNCTION SWITCH (Continued)

(3) Position the multi-function switch onto the
steering column lock housing. Be certain that the
switch alignment posts and locator tabs are fully
seated on the lock housing.
(4) Position the upper and lower shrouds onto the
steering column.
(5) Align the snap features on the lower shroud
with the receptacles on the upper shroud and apply
hand pressure to snap them together.
(6) From below the steering column, install and
tighten the two screws that secure the lower shroud
to the upper shroud. Tighten the screws to 2 N´m (20
in. lbs.).
(7) If the vehicle is equipped with the optional tilt
steering column, move the tilt steering column back
to the fully raised position and move the tilt release
lever into the locked (up) position.
(8) Reconnect the battery negative cable.
PARK LAMP RELAY
DESCRIPTION
The park lamp relay is located in the Junction
Block (JB) below the driver side outboard end of the
instrument panel in the passenger compartment of
the vehicle. The park lamp relay is a conventional
International Standards Organization (ISO) micro
relay (Fig. 53). Relays conforming to the ISO specifi-
cations have common physical dimensions, current
capacities, terminal patterns, and terminal functions.
The relay is contained within a small, rectangular,
molded plastic housing and is connected to all of therequired inputs and outputs by five integral male
spade-type terminals that extend from the bottom of
the relay base.
The park lamp relay cannot be adjusted or
repaired and, if faulty or damaged, the unit must be
replaced.
OPERATION
The park lamp relay is an electromechanical
switch that uses a low current input from the Body
Control Module (BCM) to control a high current out-
put to the park lamps. The movable common feed
contact point is held against the fixed normally
closed contact point by spring pressure. When the
relay coil is energized, an electromagnetic field is
produced by the coil windings. This electromagnetic
field draws the movable relay contact point away
from the fixed normally closed contact point, and
holds it against the fixed normally open contact
point. When the relay coil is de-energized, spring
pressure returns the movable contact point back
against the fixed normally closed contact point. A
resistor is connected in parallel with the relay coil in
the relay, and helps to dissipate voltage spikes and
electromagnetic interference that can be generated as
the electromagnetic field of the relay coil collapses.
The park lamp relay terminals are connected to
the vehicle electrical system through a connector
receptacle in the Junction Block (JB). The inputs and
outputs of the headlamp low beam relay include:
²Common Feed Terminal- The common feed
terminal (30) is connected to the park lamps through
the park lamp relay output circuit and provides
ground to the park lamps when the relay is de-ener-
gized, and battery current to the park lamps when-
ever the relay is energized.
²Coil Ground Terminal- The coil ground termi-
nal (85) is connected to a control output of the Body
Control Module (BCM) through a park lamp relay
control circuit. The BCM controls park lamp opera-
tion by controlling a ground path through this cir-
cuit.
²Coil Battery Terminal- The coil battery ter-
minal (86) receives battery current at all times from
a fuse in the PDC through a fused B(+) circuit.
²Normally Open Terminal- The normally open
terminal (87) receives battery current at all times
from a fuse in the Power Distribution Center (PDC)
through a fused B(+) circuit.
²Normally Closed Terminal- The normally
closed terminal (87A) is connected to ground at all
times through a ground circuit that receives ground
through a splice block located in the instrument
panel wire harness with an eyelet terminal connector
that is secured by a nut to a ground stud on the
Fig. 53 ISO Micro Relay
30 - COMMON FEED
85 - COIL GROUND
86 - COIL BATTERY
87 - NORMALLY OPEN
87A - NORMALLY CLOSED
8L - 54 LAMPS/LIGHTING - EXTERIORKJ
MULTI-FUNCTION SWITCH (Continued)

mission have an illuminated transmission range indi-
cator integral to the console mounted gearshift
mechanism, and controlled by the panel lamps dim-
mer circuit.
²Vanity Lamps- Available single intensity van-
ity lamps are located on each side of a covered mirror
on both the right and left sun visors, and are con-
trolled by an integral vanity mirror cover-actuated
switch on the courtesy lamp circuit.
Other components of the interior lighting system
for this model include:
²Body Control Module- The Body Control
Module (BCM) is located on the Junction Block (JB)
under the driver side outboard end of the instrument
panel. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/BODY CONTROL MODULE
- DESCRIPTION).
²Door Ajar Switches- A door ajar switch is
integral to the door latch mechanism of each front
and rear door.
²Flip-Up Glass Ajar Switch- A flip-up glass
ajar switch is integral to the flip-up glass latch mech-
anism on the top of the tailgate inner panel.
²Multi-Function Switch- The multi-function
switch is located on the top of the steering column,
just below the steering wheel. The multi-function
switch includes a left (lighting) control stalk and a
right (wiper) control stalk. The left control stalk is
dedicated to providing almost all of the driver con-
trols for both the exterior and interior lighting sys-
tems. (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING
- EXTERIOR/MULTI-FUNCTION SWITCH -
DESCRIPTION).
²Tailgate Ajar Switch- A tailgate ajar switch is
integral to the latch mechanism of the tailgate.
Hard wired circuitry connects the interior lighting
system components to the electrical system of the
vehicle. These hard wired circuits are integral to sev-
eral wire harnesses, which are routed throughout the
vehicle and retained by many different methods.
These circuits may be connected to each other, to the
vehicle electrical system and to the interior lighting
system components through the use of a combination
of soldered splices, splice block connectors, and many
different types of wire harness terminal connectors
and insulators. Refer to the appropriate wiring infor-
mation. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
further details on wire harness routing and reten-
tion, as well as pin-out and location views for the
various wire harness connectors, splices and grounds.
OPERATION
The interior lighting systems can be divided into
two general classifications based upon the circuit
that controls their operation: The courtesy lamp cir-cuit, or the panel lamps dimmer circuit. Following
are paragraphs that briefly describe the operation of
each of the major interior lighting systems. The hard
wired circuits and components of the interior lighting
systems may be diagnosed and tested using conven-
tional diagnostic tools and procedures. However, con-
ventional diagnostic methods may not prove
conclusive in the diagnosis of the Body Control Mod-
ule (BCM), the ElectroMechanical Instrument Clus-
ter (EMIC), or the Programmable Communications
Interface (PCI) data bus network. The most reliable,
efficient, and accurate means to diagnose the BCM,
the EMIC, and the PCI data bus network inputs and
outputs related to the various interior lighting sys-
tems requires the use of a DRBIIItscan tool. Refer
to the appropriate diagnostic information.
COURTESY LAMP CIRCUIT Depending upon the
selected vehicle options the courtesy lamp circuit
may include the courtesy lamps located below the
instrument panel, the dome or map/reading lamps
located in the headliner near the windshield, the
cargo lamp located in the headliner near the rear
roof header, and the vanity lamps located in the sun
visors. The lamps in the courtesy lamp circuit are
provided with battery current at all times from a
fused B(+) fuse in the Junction Block (JB) through a
fused B(+) circuit. The Body Control Module (BCM)
controls the ground path for these lamps using an
internal driver through the courtesy lamp driver cir-
cuit based upon hard wired inputs from the door ajar
switches, the flip-up glass ajar switch, and the tail-
gate ajar switch. After all of the ajar switch inputs to
the BCM transition to open, the BCM will keep the
lamps illuminated for about 27 seconds, then fade
the lamps to off (theater dimming) over about three
seconds.
The BCM also provides courtesy lamp operation
based upon a resistor multiplexed input from the
interior lighting control ring on the left (lighting)
control stalk of the multi-function switch through the
headlamp switch mux circuit, and in response to cer-
tain inputs from the optional Remote Keyless Entry
(RKE) system. A resistor multiplexed courtesy lamp
defeat input from the control ring on the left (light-
ing) control stalk of the multi-function switch will
cause the BCM to override normal courtesy lamp
operation based upon inputs from all of the ajar
switches. A hard wired input from the courtesy lamp
defeat switch in the optional cargo lamp through a
rear courtesy lamp control circuit will cause the BCM
to override normal courtesy lamp operation based
upon inputs from only the flip-up glass and tailgate
ajar switches.
For those lamps on the courtesy lamp circuit with
independent switching, such as the optional reading
lamps and vanity lamps, the BCM provides a ground
KJLAMPS/LIGHTING - INTERIOR 8L - 67
LAMPS/LIGHTING - INTERIOR (Continued)

LAMPS
TABLE OF CONTENTS
page page
LAMPS/LIGHTING - EXTERIOR
DESCRIPTION..........................2
OPERATION............................5
DIAGNOSIS AND TESTING - LAMPS/
LIGHTING - EXTERIOR..................7
SPECIFICATIONS - LAMPS/LIGHTING -
EXTERIOR...........................15
BACKUP LAMP SWITCH
DESCRIPTION.........................15
OPERATION...........................15
DIAGNOSIS AND TESTING - BACKUP LAMP
SWITCH............................15
BRAKE LAMP SWITCH
DESCRIPTION.........................16
OPERATION...........................16
DIAGNOSIS AND TESTING - BRAKE LAMP
SWITCH............................17
REMOVAL.............................17
INSTALLATION.........................18
CENTER HIGH MOUNTED STOP LAMP BULB
REMOVAL.............................18
INSTALLATION.........................19
CENTER HIGH MOUNTED STOP LAMP UNIT
REMOVAL.............................19
INSTALLATION.........................19
COMBINATION FLASHER
DESCRIPTION.........................19
OPERATION...........................19
DAYTIME RUNNING LAMP RELAY
DESCRIPTION.........................20
OPERATION...........................20
REMOVAL.............................21
INSTALLATION.........................21
FRONT FOG LAMP BULB
REMOVAL.............................21
INSTALLATION.........................22
FRONT FOG LAMP RELAY
DESCRIPTION.........................22
OPERATION...........................22
DIAGNOSIS AND TESTING - FRONT FOG
LAMP RELAY.........................23
REMOVAL.............................24
INSTALLATION.........................24
FRONT FOG LAMP UNIT
REMOVAL.............................24
INSTALLATION.........................25
ADJUSTMENTS
ADJUSTMENT - FRONT FOG LAMP UNIT . . . 25FRONT LAMP BULB
REMOVAL.............................27
INSTALLATION.........................27
FRONT LAMP UNIT
REMOVAL.............................27
INSTALLATION.........................28
FRONT POSITION LAMP BULB
REMOVAL.............................28
INSTALLATION.........................28
HAZARD SWITCH
DESCRIPTION.........................28
OPERATION...........................29
REMOVAL.............................29
INSTALLATION.........................30
HEADLAMP BULB
REMOVAL.............................30
INSTALLATION.........................32
HEADLAMP HIGH BEAM RELAY
DESCRIPTION.........................33
OPERATION...........................33
DIAGNOSIS AND TESTING - HEADLAMP
HIGH BEAM RELAY....................34
REMOVAL.............................34
INSTALLATION.........................35
HEADLAMP LEVELING MOTOR
DESCRIPTION.........................35
OPERATION...........................36
REMOVAL.............................36
INSTALLATION.........................36
HEADLAMP LEVELING SWITCH
DESCRIPTION.........................37
OPERATION...........................37
DIAGNOSIS AND TESTING - HEADLAMP
LEVELING SWITCH....................37
REMOVAL.............................38
INSTALLATION.........................38
HEADLAMP LOW BEAM RELAY
DESCRIPTION.........................39
OPERATION...........................39
DIAGNOSIS AND TESTING - HEADLAMP LOW
BEAM RELAY........................40
REMOVAL.............................40
INSTALLATION.........................41
HEADLAMP UNIT
REMOVAL.............................41
INSTALLATION.........................42
ADJUSTMENTS
ADJUSTMENT - HEADLAMP UNIT........42
KJLAMPS 8Ls - 1

LICENSE PLATE LAMP BULB
REMOVAL.............................44
INSTALLATION.........................45
LICENSE PLATE LAMP UNIT
REMOVAL.............................45
INSTALLATION.........................46
MULTI-FUNCTION SWITCH
DESCRIPTION.........................46
OPERATION...........................48
DIAGNOSIS AND TESTING - MULTI-
FUNCTION SWITCH...................50
REMOVAL.............................53
INSTALLATION.........................53
PARK LAMP RELAY
DESCRIPTION.........................54
OPERATION...........................54
DIAGNOSIS AND TESTING - PARK LAMP
RELAY..............................55
REMOVAL.............................55
INSTALLATION.........................56
REAR FOG LAMP RELAY
DESCRIPTION.........................56
OPERATION...........................57
DIAGNOSIS AND TESTING - REAR FOG
LAMP RELAY.........................57
REMOVAL.............................58
INSTALLATION.........................58
REAR LAMP BULB
REMOVAL.............................59
INSTALLATION.........................59
REAR LAMP UNIT
REMOVAL.............................59
INSTALLATION.........................60
REPEATER LAMP BULB
REMOVAL.............................60INSTALLATION.........................60
REPEATER LAMP UNIT
REMOVAL.............................61
INSTALLATION.........................61
TRAILER TOW CONNECTOR
REMOVAL.............................61
INSTALLATION.........................61
TRAILER TOW RELAY
DESCRIPTION.........................62
OPERATION...........................62
DIAGNOSIS AND TESTING - TRAILER TOW
RELAY..............................62
REMOVAL.............................63
INSTALLATION.........................63
TRAILER TOW WIRING
DESCRIPTION.........................64
LAMP BAR
DESCRIPTION.........................65
OPERATION...........................65
DIAGNOSIS AND TESTING - LAMP BAR.....65
STANDARD PROCEDURE - LAMP BAR
AIMING.............................65
REMOVAL
REMOVAL - LAMP BAR.................65
REMOVAL - LAMP.....................66
INSTALLATION
INSTALLATION - LAMP BAR.............66
INSTALLATION - LAMP.................66
LAMP BAR SWITCH
DESCRIPTION.........................67
REMOVAL.............................67
INSTALLATION.........................67
LAMPS/LIGHTING - EXTERIOR
DESCRIPTION
The exterior lighting system for this model
includes the following exterior lamps (Fig. 1):
²Backup Lamps- The backup (or reverse) lamps
are integral to the rear lamp units mounted to the
back of the quarter panel on each side of the tailgate
at the rear of the vehicle.
²Brake Lamps- The brake (or stop) lamps
include a lamp that is integral to the rear lamp units
mounted to the back of the quarter panel on each
side of the tailgate, and the Center High Mounted
Stop Lamp (CHMSL) that is centered on the rear
edge of the roof panel above the flip-up glass opening
at the rear of the vehicle.
²Daytime Running Lamps- Vehicles manufac-
tured for sale in Canada illuminate the high beam
filament in each headlamp bulb serves as the Day-
time Running Lamps (DRL).²Front Fog Lamps- Optional front fog lamps
include a single round front fog lamp unit with an
adjustable reflector and a removable bulb that is
secured behind a dedicated opening on each forward-
facing end of the front bumper fascia.
²Hazard Warning Lamps- The hazard warning
lamps include all of the right and left turn signal
lamps.
²Headlamps- A single round headlamp housing
with a fixed lens, an adjustable reflector, and a single
removable halogen bulb is secured to the grille open-
ing panel on each side of the grille opening at the
front of the vehicle. In certain markets where
required, a headlamp leveling actuator motor is
included on each headlamp.
²Park Lamps- The park lamps include the front
park lamps and front side marker lamps that are
integral to the front lamp units mounted at each end
of the bumper fascia at the front of the vehicle, as
well as the rear park lamps and rear side marker
lamps that are integral to the rear lamp units
8Ls - 2 LAMPSKJ

mounted to the back of the quarter panel on each
side of the tailgate at the rear of the vehicle. The
park lamps include a license plate lamp or lamps,
depending upon the requirements of the market for
which the vehicle is manufactured. Vehicles with a
license plate tub located near the left end of the rear
bumper fascia have a single lamp, while vehicles
with a license plate module located on the spare tire
carrier have two license plate lamps. In certain mar-
kets where required, a front position lamp that is
integral to each headlamp unit is illuminated instead
of the front park lamps and front side marker lamps
in the park lamps circuit; and, a rectangular, red
reflector is located on the rear bumper fascia just
inboard and below each rear lamp unit.
²Rear Fog Lamps- Rear fog lamps are avail-
able only in certain markets where they are required
equipment. The rear fog lamps are integral to the
rear lamp units mounted to the back of the quarter
panel on each side of the tailgate at the rear of the
vehicle.
²Turn Signal Lamps- The turn signal lamps
include the front turn signal and front side marker
lamps that are integral to the front lamp units
mounted at each end of the bumper fascia at the
front of the vehicle, as well as rear turn signal lamps
that are integral to the rear lamp units mounted to
the back of the quarter panel on each side of the tail-
gate at the rear of the vehicle. In certain markets
where required, a repeater lamp unit mounted to
each front fender just behind the front wheel opening
is illuminated instead of the front side marker lamp
in each turn signal lamp circuit.
Other components of the exterior lighting system
for this model include:
²Combination Flasher- An electronic combina-
tion flasher is integral to the hazard warning switch
in the center of the instrument panel.
²Backup Lamp Switch- Vehicles equipped with
a manual transmission have a plunger-type backup
lamp switch located on the transmission housing. A
Transmission Range Sensor (TRS) integral to the
solenoid pack on the valve body of the optional elec-
tronic automatic transmission performs the backup
lamp switch function on models that are so equipped.
²Brake Lamp Switch- A plunger-type brake
lamp switch is located on the steering column sup-
port bracket under the instrument panel and actu-
ated by the brake pedal arm.²Body Control Module- The Body Control
Module (BCM) is located on the Junction Block (JB)
under the driver side outboard end of the instrument
panel. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/BODY CONTROL MODULE
- DESCRIPTION).
²Daytime Running Lamp Relay- Vehicles
manufactured for sale in Canada use a solid state
Daytime Running Lamps (DRL) relay installed in the
Junction Block (JB) instead of the conventional high
beam relay.
²Front Fog Lamp Relay- Vehicles equipped
with the optional front fog lamps have a front fog
lamp relay located in the Junction Block (JB).
²Hazard Switch- The hazard switch is located
near the center of the instrument panel and includes
the integral electronic combination flasher circuitry
for the hazard warning system and the turn signal
system.
²Headlamp Leveling Motor- A headlamp lev-
eling actuator motor is located on the back of each
headlamp housing of vehicles manufactured for cer-
tain markets where this equipment is required.
²Headlamp Leveling Switch- A thumbwheel
actuated headlamp leveling switch is mounted in the
driver side inboard instrument panel trim bezel of
vehicles manufactured for certain markets where this
equipment is required.
²High Beam Relay- A high beam relay is
located in the Junction Block (JB) of all vehicles
except those that are manufactured for sale in Can-
ada. Canadian vehicles have a solid state Daytime
Running Lamps (DRL) relay in the JB instead of the
high beam relay.
²Low Beam Relay- A low beam relay is located
in the Junction Block (JB) of all vehicles.
²Multi-Function Switch- The multi-function
switch is located on the top of the steering column,
just below the steering wheel. The multi-function
switch includes a left (lighting) control stalk and a
right (wiper) control stalk. The left control stalk is
dedicated to providing almost all of the driver con-
trols for both the exterior and interior lighting sys-
tems.
²Park Lamp Relay- A park lamp relay is
located in the Junction Block (JB) of all vehicles.
²Rear Fog Lamp Relay- Vehicles manufac-
tured for certain markets where rear fog lamps are
required equipment have a rear fog lamp relay
located in the Junction Block (JB).
1 - HEADLAMP UNIT (2)
2 - REPEATER LAMP UNIT (2)
3 - FRONT POSITION LAMP (2)
4 - FRONT LAMP UNIT (2)5 - FRONT FOG LAMP (2)
6 - CENTER HIGH MOUNTED STOP LAMP UNIT
7 - REAR LAMP UNIT
8 - LICENSE PLATE LAMP UNIT
8Ls - 4 LAMPSKJ
LAMPS/LIGHTING - EXTERIOR (Continued)

²Trailer Tow Adapter- Vehicles equipped with
a factory-installed trailer towing package have an
adapter provided that adapts the factory-installed
heavy duty 7-way trailer tow connector to a conven-
tional 4-way light duty connector.
²Trailer Tow Connector- Vehicles equipped
with a factory-installed trailer towing package have a
heavy duty 7-way trailer tow connector installed in a
bracket on the trailer hitch receiver.
²Trailer Tow Relays- Vehicles equipped with a
factory-installed trailer towing package have a con-
nector bank containing four relays located behind the
right quarter trim panel and over the right rear
wheel housing. The four relays are used to supply
fused ignition switch output (run), brake lamps, right
turn signal, and left turn signal outputs to a trailer
through the trailer tow wiring and connectors.
Hard wired circuitry connects the exterior lighting
system components to the electrical system of the
vehicle. These hard wired circuits are integral to sev-
eral wire harnesses, which are routed throughout the
vehicle and retained by many different methods.
These circuits may be connected to each other, to the
vehicle electrical system and to the exterior lighting
system components through the use of a combination
of soldered splices, splice block connectors, and many
different types of wire harness terminal connectors
and insulators. Refer to the appropriate wiring infor-
mation. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
further details on wire harness routing and reten-
tion, as well as pin-out and location views for the
various wire harness connectors, splices and grounds.
OPERATION
Following are paragraphs that briefly describe the
operation of each of the major exterior lighting sys-
tems. The hard wired circuits and components of the
exterior lighting systems may be diagnosed and
tested using conventional diagnostic tools and proce-
dures. However, conventional diagnostic methods
may not prove conclusive in the diagnosis of the Body
Control Module (BCM), the ElectroMechanical
Instrument Cluster (EMIC), the Powertrain Control
Module (PCM), or the Programmable Communica-
tions Interface (PCI) data bus network. The most
reliable, efficient, and accurate means to diagnose
the BCM, the EMIC, the PCM, and the PCI data bus
network inputs and outputs related to the various
exterior lighting systems requires the use of a
DRBIIItscan tool. Refer to the appropriate diagnos-
tic information.BACKUP LAMPS
The backup (or reverse) lamps have a path to
ground at all times through their connection to the
rear lighting wire harness from a take out of the rear
body wire harness with an eyelet terminal connector
that is secured by a ground screw to the base of the
right D-pillar behind the quarter trim panel. The
backup lamps receive battery current from a fused
ignition switch output (run) fuse in the Junction
Block (JB) on the back-up lamp feed circuit only
when the backup lamp switch (manual transmission),
or backup lamp switch circuit of the Transmission
Range Sensor (TRS - electronic automatic transmis-
sion) is closed by the gearshift mechanism within the
transmission.
BRAKE LAMPS
The brake (or stop) lamps have a path to ground at
all times through their connection to the rear light-
ing wire harness from a take out of the rear body
wire harness with an eyelet terminal connector that
is secured by a screw to the base of the right D-pillar
behind the quarter trim panel. The Center High
Mounted Stop Lamp (CHMSL) has a path to ground
at all times through its connection to the rear body
wire harness from a take out of the rear body wire
harness with an eyelet terminal connector that is
secured by a ground screw to the driver side D-pillar
(left side D-pillar for left-hand drive, right side D-pil-
lar for right-hand drive) behind the quarter trim
panel. The brake lamps and CHMSL receive battery
current from a fused B(+) fuse in the Junction Block
(JB) on the brake lamp switch output circuit only
when the brake lamp switch circuit of the brake
lamp switch is closed by the brake pedal arm.
DAYTIME RUNNING LAMPS
Vehicles manufactured for sale in Canada illumi-
nate the high beam filament at a reduced intensity
when the engine is running and the exterior lamps
are turned off. This feature is enabled by the Body
Control Module (BCM) and a solid state Daytime
Running Lamps (DRL) relay, which is installed in the
Junction Block (JB) and the high beam relay is omit-
ted. When the BCM monitors an engine speed signal
of greater than 450 RPM and the status of the exte-
rior lighting switch input from the multi-function
switch is Off, the BCM duty cycles the DRL relay to
produce illumination of the headlamp high beam fil-
aments at a reduced intensity. The BCM also pro-
vides normal headlamp high beam operation through
the DRL relay on vehicles so equipped. When the
DRL relay is energized, it provides battery current
from a fused B(+) fuse in the JB to the headlamp
high beam filament through the DRL relay output
circuit.
KJLAMPS8Ls-5
LAMPS/LIGHTING - EXTERIOR (Continued)