Egr JEEP LIBERTY 2002 KJ / 1.G Repair Manual

INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE SUPPLEMENTAL RESTRAINT
SYSTEM BEFORE ATTEMPTING ANY STEERING
WHEEL, STEERING COLUMN, DRIVER AIRBAG,
PASSENGER AIRBAG, SEAT BELT TENSIONER,
FRONT IMPACT SENSORS, SIDE CURTAIN AIRBAG,
OR INSTRUMENT PANEL COMPONENT DIAGNOSIS
OR SERVICE. DISCONNECT AND ISOLATE THE
BATTERY NEGATIVE (GROUND) CABLE, THEN
WAIT TWO MINUTES FOR THE SYSTEM CAPACI-
TOR TO DISCHARGE BEFORE PERFORMING FUR-
THER DIAGNOSIS OR SERVICE. THIS IS THE ONLY
SURE WAY TO DISABLE THE SUPPLEMENTAL
RESTRAINT SYSTEM. FAILURE TO TAKE THE
PROPER PRECAUTIONS COULD RESULT IN ACCI-
DENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
(1) Position the headlamp high beam relay to the
proper receptacle in the Junction Block (JB) (Fig. 30).
(2) Align the headlamp high beam relay terminals
with the terminal cavities in the JB receptacle.
(3) Push firmly and evenly on the top of the head-
lamp high beam relay until the terminals are fully
seated in the terminal cavities in the JB receptacle.
(4) Reinstall the end cap onto the driver side out-
board end of the instrument panel. (Refer to 23 -
BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL END CAP - INSTALLATION).
(5) Reconnect the battery negative cable.
HEADLAMP LEVELING MOTOR
DESCRIPTION
The headlamp leveling motor is located on the rear
inboard side of each headlamp unit on models
equipped with the headlamp leveling system, which
is available only in certain markets where required
(Fig. 31). The motor is encased within a molded plas-
tic housing and is secured by an integral wedge-type
mounting boss on its forward surface to a flanged
receptacle on the back of the headlamp unit housing.
A rubber seal around the circumference of the
mounting boss is compressed and seals the motor to
the headlamp unit when the boss is properly
installed in the flanged receptacle. The outside of the
motor housing features an integral molded connector
receptacle 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 center of the mounting
boss at the front. Within the motor housing is a
12-volt Direct Current (DC) servo motor, an elec-
tronic 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 dedicated take
out and connector of the front fascia wire harness.
The headlamp leveling motor cannot be repaired
and, if faulty or damaged, the unit must be replaced.
Fig. 30 Junction Block - Outboard Side (RHD Shown
- Rotate 180É for LHD)
1 - JB/BCM CONNECTOR
2 - HIGH BEAM RELAY
3 - DRL RELAY
Fig. 31 Headlamp Unit - With Leveling
1 - LEVELING MOTOR (IF EQUIPPED)
2 - BOOT SEAL
3 - ADJUSTING SCREW
4 - LOCATOR TAB
5 - HOUSING
6 - FRONT POSITION LAMP SOCKET & BULB
7 - HEADLAMP BULB
8 - MOUNTING TAB (2)
KJLAMPS/LIGHTING - EXTERIOR 8L - 35
HEADLAMP HIGH BEAM RELAY (Continued)

OPERATION
The controller board and logic circuitry of the
headlamp leveling motor will energize the motor and
extend or retract the motor pushrod through the
integral screw-drive transmission based upon the
voltage signal input received from the resistor multi-
plexed headlamp leveling switch. The ball formation
on the end of the headlamp leveling motor pushrod is
snapped into a socket formation on the back of the
movable reflector within the headlamp unit housing.
The headlamp leveling motors and switch have a
path to ground at all times. The headlamp leveling
components operate on battery current 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 with
conventional automotive electrical test equipment. If
the headlamp leveling motor is believed to be faulty,
replace the motor with a known good unit to confirm
system operation.
REMOVAL
The headlamp leveling motors are integral to the
headlamp units on vehicles manufactured for certain
markets where headlamp leveling is required.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the headlamp bulb from the headlamp
unit housing. (Refer to 8 - ELECTRICAL/LAMPS/
LIGHTING - EXTERIOR/HEADLAMP BULB -
REMOVAL).
(3) Rotate the headlamp leveling motor on the
back of the headlamp unit housing counterclockwise
about 30 degrees (Fig. 32).
(4) Firmly grasp the motor with one hand while
stabilizing the headlamp unit housing with the other
hand.
(5) Firmly, steadily, and forcefully pull the head-
lamp leveling motor straight away from the back of
the headlamp unit housing to unsnap the ball forma-
tion on the end of the motor pushrod from the socket
on the headlamp unit reflector (Fig. 33).
(6) Remove the headlamp leveling motor and push-
rod from the back of the headlamp unit housing.
INSTALLATION
The headlamp leveling motors are integral to the
headlamp units on vehicles manufactured for certain
markets where headlamp leveling is required.
(1) Position the headlamp leveling motor and
pushrod from to the mounting hole on the back of the
headlamp unit housing.
(2) Insert two fingers through the bulb mounting
hole in the center of the headlamp reflector and pullthe reflector upwards toward the headlamp leveling
motor.
(3) Align the ball formation on the end of the lev-
eling motor pushrod with the socket on the headlamp
unit reflector (Fig. 33).
(4) While continuing to pulling the reflector
toward the motor, firmly, steadily, and forcefully push
the headlamp leveling motor straight into the back of
the headlamp unit housing to snap the ball formation
on the end of the motor pushrod into the socket on
the headlamp unit reflector.
(5) After the pushrod is engaged to the reflector,
remove your fingers from the bulb mounting hole in
Fig. 32 Headlamp Leveling Motor Remove/Install
1 - LEVELING MOTOR
2 - HEADLAMP HOUSING
3 - PUSHROD
Fig. 33 Leveling Motor Pushrod - Typical
1 - REFLECTOR PUSHROD SOCKET
2 - PUSHROD
3 - LEVELING MOTOR
4 - HEADLAMP HOUSING
8L - 36 LAMPS/LIGHTING - EXTERIORKJ
HEADLAMP LEVELING MOTOR (Continued)

the center of the headlamp reflector and thoroughly
clean any fingerprints from the reflector.
(6) Push the mounting flange of the headlamp lev-
eling motor into the mounting hole on the back of
headlamp unit housing unit the motor is firmly
seated (Fig. 32).
(7) Rotate the headlamp leveling motor on the
back of the headlamp unit housing clockwise about
30 degrees.
(8) Reinstall the headlamp bulb into the headlamp
unit housing. (Refer to 8 - ELECTRICAL/LAMPS/
LIGHTING - EXTERIOR/HEADLAMP BULB -
INSTALLATION).
(9) Reconnect the battery negative cable.
HEADLAMP LEVELING
SWITCH
DESCRIPTION
The headlamp leveling switch (Fig. 34) is used only
on vehicles manufactured for certain markets where
the headlamp leveling system is required. The head-
lamp leveling switch is mounted in the driver side
inboard trim bezel on the instrument panel, where it
is secured by molded latch features that are integral
to the switch housing. Only the switch bezel and
thumbwheel are visible on the outer surface of the
instrument panel trim bezel. The black plastic switch
thumbwheel is marked with white numbers ª0,º ª1,º
ª2,º and ª3,º each of which indicates one of the four
switch detent positions. Each higher number repre-sents a lower aiming position of the headlamp beam
relative to the road surface. The black, molded plas-
tic switch housing has an integral connector recepta-
cle on the back, a single latch feature on the top, and
two latch features (one on each side) on the bottom.
The switch is connected to the vehicle electrical sys-
tem through a dedicated take out and connector of
the instrument panel wire harness. Within the
switch housing is the leveling switch circuitry includ-
ing the switch contacts and a series resistor configu-
ration.
The headlamp leveling switch cannot be adjusted
or repaired and, if faulty or damaged, the unit must
be replaced.
OPERATION
The headlamp leveling switch receives battery cur-
rent on a fused park lamp relay output circuit from a
fuse in the Junction Block (JB) whenever the park
lamp relay is energized (park lamps are turned On).
The switch receives a path to 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 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 sig-
nal 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.
DIAGNOSIS AND TESTING - HEADLAMP
LEVELING SWITCH
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE SUPPLEMENTAL RESTRAINT
SYSTEM BEFORE ATTEMPTING ANY STEERING
WHEEL, STEERING COLUMN, DRIVER AIRBAG,
PASSENGER AIRBAG, SEAT BELT TENSIONER,
FRONT IMPACT SENSORS, SIDE CURTAIN AIRBAG,
OR INSTRUMENT PANEL COMPONENT DIAGNOSIS
OR SERVICE. DISCONNECT AND ISOLATE THE
BATTERY NEGATIVE (GROUND) CABLE, THEN
WAIT TWO MINUTES FOR THE SYSTEM CAPACI-
TOR TO DISCHARGE BEFORE PERFORMING FUR-
THER DIAGNOSIS OR SERVICE. THIS IS THE ONLY
SURE WAY TO DISABLE THE SUPPLEMENTAL
RESTRAINT SYSTEM. FAILURE TO TAKE THE
PROPER PRECAUTIONS COULD RESULT IN ACCI-
DENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
Fig. 34 Headlamp Leveling Switch
1 - SWITCH
2 - UPPER LATCH FEATURE (1)
3 - CONNECTOR RECEPTACLE
4 - LOWER LATCH FEATURE (2)
5 - THUMBWHEEL
KJLAMPS/LIGHTING - EXTERIOR 8L - 37
HEADLAMP LEVELING MOTOR (Continued)

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE SUPPLEMENTAL RESTRAINT
SYSTEM BEFORE ATTEMPTING ANY STEERING
WHEEL, STEERING COLUMN, DRIVER AIRBAG,
PASSENGER AIRBAG, SEAT BELT TENSIONER,
FRONT IMPACT SENSORS, SIDE CURTAIN AIRBAG,
OR INSTRUMENT PANEL COMPONENT DIAGNOSIS
OR SERVICE. DISCONNECT AND ISOLATE THE
BATTERY NEGATIVE (GROUND) CABLE, THEN
WAIT TWO MINUTES FOR THE SYSTEM CAPACI-
TOR TO DISCHARGE BEFORE PERFORMING FUR-
THER DIAGNOSIS OR SERVICE. THIS IS THE ONLY
SURE WAY TO DISABLE THE SUPPLEMENTAL
RESTRAINT SYSTEM. FAILURE TO TAKE THE
PROPER PRECAUTIONS COULD RESULT IN ACCI-
DENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
(1) From the face of the driver side inboard bezel,
align the headlamp leveling switch housing to the
mounting hole in the bezel (Fig. 36).
(2) Push the headlamp leveling switch into the
mounting hole until it is fully seated and the upper
latch and two lower latch features on the switch
housing are engaged on the back of the bezel.
(3) Position the switch and bezel unit to the
instrument panel.
(4) Reconnect the instrument panel wire harness
connector for the headlamp leveling switch to the
switch connector receptacle.
(5) Reinstall the driver side inboard bezel onto the
instrument panel. (Refer to 23 - BODY/INSTRU-
MENT PANEL/INSTRUMENT PANEL DRIVER
SIDE BEZEL - INSTALLATION).
(6) Reconnect the battery negative cable.
HEADLAMP LOW BEAM RELAY
DESCRIPTION
The headlamp low beam relay is located in the
Junction Block (JB) below the driver side outboard
end of the instrument panel in the passenger com-
partment of the vehicle. The headlamp low beam
relay is a conventional International Standards
Organization (ISO) micro relay (Fig. 37). Relays con-
forming to the ISO specifications have common phys-
ical dimensions, current capacities, terminal
patterns, and terminal functions. The relay is con-
tained within a small, rectangular, molded plastic
housing and is connected to all of the required inputs
and outputs by five integral male spade-type termi-
nals that extend from the bottom of the relay base.
The headlamp low beam relay cannot be adjusted
or repaired and, if faulty or damaged, the unit must
be replaced.
OPERATION
The headlamp low beam relay is an electromechan-
ical switch that uses a low current input from the
Body Control Module (BCM) to control a high current
output to the headlamp low beam filaments. 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 electro-
magnetic field is produced by the coil windings. This
electromagnetic field draws the movable relay con-
tact point away from the fixed normally closed con-
tact point, and holds it against the fixed normally
open contact point. When the relay coil is de-ener-
gized, 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 headlamp low beam relay terminals are con-
nected to the vehicle electrical system through a con-
nector 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) receives battery current at all times
from a fuse in the Power Distribution Center (PDC)
through a fused B(+) circuit.
²Coil Ground Terminal- The coil ground termi-
nal (85) receives battery current at all times from a
fuse in the PDC through a fused B(+) circuit.
Fig. 37 ISO Micro Relay
30 - COMMON FEED
85 - COIL GROUND
86 - COIL BATTERY
87 - NORMALLY OPEN
87A - NORMALLY CLOSED
KJLAMPS/LIGHTING - EXTERIOR 8L - 39
HEADLAMP LEVELING SWITCH (Continued)

(3) Turn the adjusting screw (Fig. 44) until the top
edge of the beam intensity pattern is positioned from
just below horizontal to 75 millimeters (3 inches)
below the headlamp horizontal centerline for vehicles
in North America, or from just below horizontal to
125 millimeters (5 inches) below the headlamp hori-
zontal centerline for vehicles in Rest-Of-World.
(4) Repeat the adjustment procedure for the oppo-
site headlamp.
LICENSE PLATE LAMP BULB
REMOVAL
NORTH AMERICA
(1) Disconnect and isolate the battery negative
cable.
(2) Reach through the opening in the rear bumper
fascia between the license plate and the lamp to
access and firmly grasp the socket on the back of the
license plate lamp unit housing (Fig. 45).
(3) Pull the socket and bulb straight out of the
back of the license plate lamp unit housing.
(4) Pull the bulb straight out of the license plate
lamp unit socket.
REST-OF-WORLD
(1) Disconnect and isolate the battery negative
cable.
(2) Unsnap and lift up the bottom of the license
mounting plate far enough to access and remove the
two screws that secure the license plate bracket to
the special lug nuts on the spare tire (Fig. 46).(3) Swing the license plate bracket away from the
spare tire far enough to access the license plate lamp
bulb sockets.
(4) Firmly grasp the socket on the top of the
license plate lamp unit housing for the bulb that is
being removed (Fig. 47).
(5) Rotate the socket on the top of the license plate
lamp unit housing counterclockwise about 30
degrees.
(6) Pull the socket and bulb straight out of the top
of the license plate lamp unit housing.
Fig. 44 Headlamp Adjusting Screw
1 - HEADLAMP UNIT
2 - FENDER PANEL
3 - ADJUSTING SCREW ACCESS HOLE
4 - UPPER RADIATOR CROSSMEMBER
Fig. 45 License Plate Lamp Bulb Remove/Install -
North America
1 - REAR BUMPER FASCIA
2 - LICENSE PLATE LAMP
3 - SOCKET
4 - BULB
Fig. 46 License Plate Bracket - Rest-Of-World
1 - SPARE TIRE
2 - SPECIAL LUG NUT (2)
3 - LICENSE PLATE BRACKET
4 - SCREW (2)
8L - 44 LAMPS/LIGHTING - EXTERIORKJ
HEADLAMP UNIT (Continued)

(7) Pull the bulb straight out of the license plate
lamp unit socket.
INSTALLATION
CAUTION: Always use the correct bulb size and
type for replacement. An incorrect bulb size or type
may overheat and cause damage to the lamp, the
socket and/or the lamp wiring.
NORTH AMERICA
(1) Align the base of the bulb with the receptacle
in the license plate lamp unit socket.
(2) Push the bulb straight into the license plate
lamp unit socket until it is firmly seated.
(3) Reach through the opening in the rear bumper
fascia between the license plate and the lamp to
align the socket and bulb with the socket opening on
the back of the lamp unit housing (Fig. 45).
(4) Push the socket and bulb straight into the
license plate lamp unit housing until it is firmly
seated.
(5) Reconnect the battery negative cable.
REST-OF-WORLD
(1) Align the base of the bulb with the receptacle
in the license plate lamp unit socket.
(2) Push the bulb straight into the license plate
lamp unit socket until it is firmly seated.
(3) Align the socket and bulb with the socket open-
ing on the top of the license plate lamp unit housing
(Fig. 47).(4) Push the socket and bulb straight into the
license plate lamp unit housing until it is firmly
seated.
(5) Rotate the socket on the top of the license plate
lamp unit housing clockwise about 30 degrees.
(6) Swing the license plate bracket back against
the spare tire (Fig. 46).
(7) Lift up the bottom of the license mounting
plate far enough to install and tighten the two
screws that secure the license plate bracket to the
special lug nuts on the spare tire. Tighten the screws
to 28 N´m (21 ft. lbs.).
(8) Lower the bottom of the license mounting plate
and, using hand pressure, snap it into place on the
license plate bracket.
(9) Reconnect the battery negative cable.
LICENSE PLATE LAMP UNIT
REMOVAL
NORTH AMERICA
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the two screws that secure the license
plate lamp unit to the rear bumper fascia (Fig. 48).
(3) Pull the license plate lamp unit down and out
through the mounting hole in the rear bumper fascia
far enough to access and disconnect the wire harness
connector for the lamp socket pigtail wire.
(4) Remove the license plate lamp unit from the
rear bumper fascia.
Fig. 47 License Plate Lamp Bulb Remove/Install -
Rest-Of-World
1 - LAMP UNIT (2)
2 - LICENSE PLATE BRACKET
3 - SCREW (4)
4 - BULB & SOCKET (2)
Fig. 48 License Plate Lamp Unit Remove/Install
1 - REAR BUMPER FASCIA
2 - LICENSE PLATE LAMP UNIT
3 - SCREW (2)
KJLAMPS/LIGHTING - EXTERIOR 8L - 45
LICENSE PLATE LAMP BULB (Continued)

REST-OF-WORLD
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the bulb and socket unit from the
license plate lamp unit housing that is being
removed. (Refer to 8 - ELECTRICAL/LAMPS/LIGHT-
ING - EXTERIOR/LICENSE PLATE LAMP BULB -
REMOVAL - REST-OF-WORLD).
(3) Remove the two screws that secure the license
plate lamp unit to the back of the license plate
bracket (Fig. 49).
(1) Remove the license plate lamp unit from the
back of the license plate bracket.
INSTALLATION
NORTH AMERICA
(1) Position the license plate lamp unit to the rear
bumper fascia.
(2) Reconnect the wire harness connector for the
license plate lamp unit to the lamp socket pigtail
wire.
(3) Position the license plate lamp unit into the
mounting hole in the rear bumper fascia (Fig. 48).
(4) Install and tighten the two screws that secure
the license plate lamp unit housing to the rear
bumper fascia. Tighten the screws to 2 N´m (20 in.
lbs.).
(5) Reconnect the battery negative cable.
REST-OF-WORLD
(1) Position the license plate lamp unit onto the
back of the license plate bracket (Fig. 49).(2) Install and tighten the two screws that secure
the license plate lamp unit to the back of the license
plate bracket. Tighten the screws to 2 N´m (20 in.
lbs.).
(3) Reinstall the bulb and socket unit into the
license plate lamp unit housing that is being
replaced. (Refer to 8 - ELECTRICAL/LAMPS/LIGHT-
ING - EXTERIOR/LICENSE PLATE LAMP BULB -
INSTALLATION - REST-OF-WORLD).
(4) Reconnect the battery negative cable.
MULTI-FUNCTION SWITCH
DESCRIPTION
The multi-function switch is located on the steering
column, just below the steering wheel (Fig. 50). The
only visible components of the multi-function switch
are two levers, or control stalks that extend through
dedicated openings in each side of the steering col-
umn shrouds. The remainder of the switch, its
mounting provisions, and its electrical connections
are all concealed beneath the steering column
shrouds. The switch housing and controls are con-
structed of molded black plastic. A saddle-like forma-
tion in the center of the multi-function switch
housing straddles the steering column tube just
below the column lock housing, and two posts inte-
gral to the lower surface of the switch housing
engage two holes on the forward-facing side of the
lock housing. Two integral ledge-like locating tabs
near the top of the rearward facing switch housing
surface are supported and located by two upright
stanchions that extend upward from the top of the
lock housing. Also on the rearward facing switch
housing surface near the center, an integral ledge-
like mounting tab rests on a similar ledge-like tab
that extends from each side of the steering column
lock housing. When the steering column shrouds are
installed on the column, the switch mounting tabs
are clamped along with the mounting tabs of the
clockspring between the integral mounting stan-
chions of the upper shroud and the lock housing tabs,
and are secured to the steering column lock housing
by the same two screws that secure the two shroud
halves to each other and the column.
There are several versions of the multi-function
switch to support both optional equipment and equip-
ment that is required only in certain markets. Each
multi-function switch control stalk has both white
nomenclature and International Control and Display
Symbol graphics applied to it, which clearly identify
its many functions. Each control stalk has a control
knob on its end with a flattened face to allow it to be
easily rotated. On vehicles equipped with optional
front fog lamps, the knob on the end of left control
Fig. 49 License Plate Lamp Bulb Remove/Install -
Rest-Of-World
1 - LAMP UNIT (2)
2 - LICENSE PLATE BRACKET
3 - SCREW (4)
4 - BULB & SOCKET (2)
8L - 46 LAMPS/LIGHTING - EXTERIORKJ
LICENSE PLATE LAMP UNIT (Continued)

stalk can also be pulled outward to select those
lamps. Each control stalk also features a knurled
control ring located just below the control knob. The
left control stalk is dedicated to providing driver con-
trols for the interior and exterior lighting systems,
while the right control stalk is dedicated to providing
driver controls for the front and rear wiper systems.
Two integral connector receptacles on the forward
facing surface of the multi-function switch housing
connect the switch two the vehicle electrical system
through two take outs and connectors of the instru-
ment panel wire harness. The left connector recepta-
cle contains nine terminal pins for the lighting
control circuits of the switch, while the right connec-
tor receptacle contains six terminal pins for the
wiper control circuits of the switch. The multi-func-
tion switch cannot be adjusted or repaired and, if
faulty or damaged, it must be replaced.
LEFT CONTROL STALK The left (lighting) control
stalk of the multi-function switch supports the fol-
lowing functions and features:
²Front Fog Lamps- For vehicles so equipped,
the internal circuitry and hardware of the multi-
function switch left (lighting) control stalk provide
detent switching for the optional front fog lamps.
²Headlamps- The internal circuitry and hard-
ware of the multi-function switch left (lighting) con-
trol stalk provide detent switching for the
headlamps.²Headlamp Beam Selection- The internal cir-
cuitry and hardware of the multi-function switch left
(lighting) control stalk provide detent switching for
selection of the headlamp high or low beams.
²Headlamp Optical Horn- The internal cir-
cuitry and hardware of the multi-function switch left
(lighting) control stalk includes momentary switching
of the headlamp high beam circuits to provide an
optical horn feature (sometimes referred to as flash-
to-pass), which allows the vehicle operator to momen-
tarily flash the headlamp high beams as an optical
signalling device.
²Interior Lamps Defeat- The internal circuitry
and hardware of the multi-function switch left (light-
ing) control stalk provide detent switching to defeat
the illumination of all interior courtesy lamps when a
door, the rear flip-up glass, or the tailgate are
opened.
²Interior Lamps On- The internal circuitry and
hardware of the multi-function switch left (lighting)
control stalk provide detent switching to simulta-
neously illuminate all interior courtesy lamps.
²Panel Lamps Dimming- The internal cir-
cuitry and hardware of the multi-function switch left
(lighting) control stalk provide simultaneous adjust-
able control of the illumination intensity of all instru-
ment panel lighting at one of six available
illumination intensity levels.
²Parade Mode- The internal circuitry and hard-
ware of the multi-function switch left (lighting) con-
Fig. 50 Multi-Function Switch
1 - MULTI-FUNCTION SWITCH
2 - RIGHT (WIPER) CONTROL STALK
3 - LEFT (LIGHTING) CONTROL STALK
4 - TURN SIGNAL CANCEL ACTUATOR
5 - RIGHT (WIPER) CONTROL KNOB6 - RIGHT (WIPER) CONTROL RING
7 - LEFT (LIGHTING) CONTROL RING
8 - LEFT (LIGHTING) CONTROL KNOB
KJLAMPS/LIGHTING - EXTERIOR 8L - 47
MULTI-FUNCTION SWITCH (Continued)

trol stalk provide detent switching for a parade mode
that maximizes the illumination intensity of all
instrument panel lighting for visibility when driving
in daylight with the exterior lamps turned on.
²Park Lamps- The internal circuitry and hard-
ware of the multi-function switch left (lighting) con-
trol stalk provide detent switching for the park
lamps.
²Rear Fog Lamps- For vehicles so equipped,
the internal circuitry and hardware of the multi-
function switch left (lighting) control stalk provide
detent switching for the optional rear fog lamps.
Rear fog lamps are optional only for vehicles manu-
factured for certain markets, where they are
required.
²Turn Signal Control- The internal circuitry
and hardware of the multi-function switch left (light-
ing) control stalk provide both momentary non-detent
switching and detent switching with automatic can-
cellation for both the left and right turn signal
lamps.
RIGHT CONTROL STALK The right (wiper) con-
trol stalk of the multi-function switch supports the
following functions and features:
²Continuous Front Wipe Modes- The internal
circuitry and hardware of the multi-function switch
right (wiper) control stalk provide two continuous
front wipe switch positions, low speed or high speed.
²Continuous Rear Wipe Mode- The internal
circuitry and hardware of the multi-function switch
right (wiper) control stalk provide one continuous
rear wipe switch position.
²Front Washer Mode- The internal circuitry
and hardware of the multi-function switch right
(wiper) control stalk switch provide front washer sys-
tem operation.
²Front Wipe-After-Wash Mode- The internal
circuitry and hardware of the multi-function switch
right (wiper) control stalk provide a wipe-after-wash
mode.
²Front Wiper Mist Mode- The internal cir-
cuitry and hardware of the multi-function switch
right (wiper) control stalk provide a front wiper sys-
tem mist mode.
²Intermittent Front Wipe Mode- The internal
circuitry and hardware of the multi-function switch
right (wiper) control stalk provide an intermittent
front wipe mode with five delay interval positions.
²Intermittent Rear Wipe Mode- The internal
circuitry and hardware of the multi-function switch
right (wiper) control stalk provide one fixed interval
intermittent rear wipe mode switch position.
²Rear Washer Mode- The internal circuitry and
hardware of the multi-function switch right (wiper)
control stalk provide rear washer system operation.OPERATION
The multi-function switch uses a combination of
resistor multiplexed and conventionally switched out-
puts to control the many functions and features it
provides. The switch receives battery current on a
fused ignition switch output (run-acc) circuit from a
fuse in the Junction Block (JB) whenever the ignition
switch is in the On or Accessory positions. The switch
receives a path to ground at all times through a
splice block located in the instrument panel wire har-
ness with an eyelet terminal connector that is
secured by a nut to a ground stud on the driver side
instrument panel end bracket near the Junction
Block (JB). Following are descriptions of how each of
the two multi-function switch control stalks operate
to control the functions and features they provide.
LEFT CONTROL STALK The left (lighting) control
stalk of the multi-function switch operates as follows:
²Front Fog Lamps- For vehicles so equipped,
the control knob on the end of the multi-function
switch left (lighting) control stalk is pulled outward
to activate the optional front fog lamps. The control
knob is mechanically keyed so that it cannot be
pulled outward unless it is first rotated to turn on
the exterior lighting. The multi-function switch pro-
vides a resistor multiplexed output to the Body Con-
trol Module (BCM) on a fog lamp switch sense
circuit, and the BCM responds by energizing or de-
energizing the front fog lamp relay in the Junction
Block (JB) as required.
²Headlamps- The control knob on the end of
the multi-function switch left (lighting) control stalk
is rotated forward (counterclockwise) to its second
detent position to activate the headlamps. The multi-
function switch provides a resistor multiplexed out-
put to the Body Control Module (BCM) on a
headlamp switch sense circuit, and the BCM
responds by energizing or de-energizing the selected
low or high beam relay (Daytime Running Lamp
relay in Canadian vehicles) in the Junction Block
(JB) as required.
²Headlamp Beam Selection- The left (lighting)
control stalk of the multi-function switch is pulled
towards the steering wheel past a detent to actuate
the integral beam select switch circuitry. Each time
the control stalk is activated in this manner, the
opposite headlamp beam from what is currently
selected will be energized. The multi-function switch
provides a ground output to the Body Control Module
(BCM) on a high beam switch sense circuit, and the
BCM responds by energizing or de-energizing the
selected low or high beam relay (Daytime Running
Lamp relay in Canadian vehicles) in the Junction
Block (JB) as required.
²Headlamp Optical Horn- The left (lighting)
control stalk of the multi-function switch is pulled
8L - 48 LAMPS/LIGHTING - EXTERIORKJ
MULTI-FUNCTION SWITCH (Continued)

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)