DOOR JEEP GRAND CHEROKEE 2002 WJ / 2.G Owner's Guide

²Passenger Door Module (PDM)- Refer to
Electronic Control Modules for more information.
OPERATION - REAR WINDOW DEFOGGER
The rear window defogger system is controlled by a
momentary switch that is integral to the a/c heater
control located in the center stack area of the instru-
ment panel. A Light-Emitting Diode (LED) in the
switch button will light to indicate when the rear
window defogger system is turned on. The BCM,
which contains the rear window defogger system
timer and control logic, monitors the status of the
defogger switch through a hard-wired input. The
BCM then sends control outputs through a hard
wired circuit to energize or de-energize the defogger
relay.
The electrically heated outside rear view mirror
heating grids are also controlled by the rear window
defogger switch. When the BCM receives an input
from the switch, it sends a defogger switch status
message to the DDM and the PDM over the PCI data
bus. The DDM and PDM respond to the defogger
switch status messages by energizing or de-energiz-
ing the battery current feed to their respective out-
side rear view mirror heating grids.
The rear window defogger system will be automat-
ically turned off after a programmed time interval of
about ten minutes. After the initial time interval has
expired, if the defogger switch is turned on again
during the same ignition cycle, the defogger system
will automatically turn off after about five minutes.
The defogger system will automatically shut off if the
ignition switch is turned to the Off position, or it can
be turned off manually by depressing the rear win-
dow defogger switch again.
See the owner's manual in the vehicle glove box for
more information on the features, use and operation
of the rear window defogger system.
DIAGNOSIS AND TESTING - REAR WINDOW
DEFOGGER SYSTEM
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN AN ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.For complete circuit diagrams, (Refer to Appropri-
ate Wiring Information). The operation of the electri-
cally heated rear window defogger system can be
confirmed in one of the following manners:
1. Turn the ignition switch to the On position.
While monitoring the instrument panel voltmeter,
depress the rear window defogger switch to the On
position. When the rear window defogger switch is
turned On, a distinct voltmeter needle deflection
should be noted.
2. Turn the ignition switch to the On position.
Depress the rear window defogger switch to the On
position. The rear window defogger operation can be
checked by feeling the rear window or outside rear
view mirror glass. A distinct difference in tempera-
ture between the grid lines and the adjacent clear
glass or the mirror glass can be detected within three
to four minutes of operation.
3. Using a 12-volt DC voltmeter, contact the rear
glass heating grid terminal A (right side) with the
negative lead, and terminal B (left side) with the pos-
itive lead (Fig. 1). The voltmeter should read battery
voltage.
The above checks will confirm rear window defog-
ger system operation. Illumination of the rear win-
dow defogger switch LED indicator means that there
is battery current available at the output of the rear
window defogger relay, but does not confirm that bat-
tery current is reaching the rear glass heating grid
lines.
If the rear window defogger system does not oper-
ate, the problem should be isolated in the following
manner:
Fig. 1 REAR WINDOW GLASS GRID TEST
1 - TERMINAL ªAº
2 - TERMINAL ªBº
3 - FEED WIRE
4 - MID-POINT ªCº (TYPICAL)
5 - HEATED REAR WINDOW DEFOGGER GRID
6 - GROUND WIRE
8G - 2 HEATED GLASSWJ
HEATED GLASS (Continued)

(1) Confirm that the ignition switch is in the On
position.
(2) Ensure that the rear glass heating grid feed
and ground terminals are connected to the glass.
Confirm that the ground wire has continuity to
ground.
(3) Check the fused B(+) fuse in the Power Distri-
bution Center (PDC). The fuse must be tight in its
receptacles and all electrical connections must be
secure.
When the above steps have been completed and the
rear glass heating grid is still inoperative, one or
more of the following is faulty:
²Rear window defogger switch
²Rear window defogger relay
²Body Control Module (BCM)
²Rear window grid lines (all grid lines would
have to be broken or one of the feed wires discon-
nected for the entire system to be inoperative).
When the above steps have been completed and the
heated mirror glass heating grid is still inoperative,
one or more of the following is faulty:
²Body Control Module (BCM)
²Programmable Communications Interface (PCI)
data bus
²Driver Door Module (DDM) or Passenger Door
Module (PDM)
²Outside rear view mirror heating grids.
If turning the rear window defogger system on pro-
duces a severe voltmeter deflection, check for a short
circuit between the rear window defogger relay out-
put and the rear glass heating grid.
REAR WINDOW DEFOGGER
GRID
DESCRIPTION
The electrically heated rear window glass is stan-
dard equipment on this model. The liftgate flip-up
glass has two electrically conductive vertical bus bars
and a series of horizontal grid lines made of a silver-
ceramic material, which is baked on and bonded to
the inside surface of the glass. These grid lines and
the bus bars comprise a parallel electrical circuit. A
spade type terminal near the top of each bus bar
accept the connectors from the two coiled liftgate
wire harness take outs.
The grid lines and bus bars are highly resistant to
abrasion. However, it is possible for an open circuit
to occur in an individual grid line, resulting in no
current flow through the line. The grid lines can be
damaged or scraped off with sharp instruments. Care
should be taken when cleaning the glass or removing
foreign materials, decals, or stickers from the glass.Normal glass cleaning solvents or hot water used
with rags or toweling is recommended.
A repair kit is available to repair the grid lines and
bus bars, or to reinstall the heated glass terminals.
(Refer to 8 - ELECTRICAL/HEATED GLASS/REAR
WINDOW DEFOGGER GRID - STANDARD PROCE-
DURE)
OPERATION
The rear glass heating grid is energized and de-en-
ergized by the rear window defogger relay. The Body
Control Module (BCM) monitors the rear window
defogger switch. When the BCM receives an input
from the switch, it energizes or de-energizes the rear
window defogger relay through a hard wired control
output. The rear defogger relay switches fused bat-
tery current to the rear window grid lines through
the bus bars. The grid lines heat the rear window
glass to clear the surface of ice, snow or fog. Protec-
tion for the rear glass heating grid circuit is provided
by a fuse in the Power Distribution Center (PDC).
DIAGNOSIS AND TESTING - REAR WINDOW
DEFOGGER GRID
For complete circuit diagrams, (Refer to Appropri-
ate Wiring Information). To detect breaks in the rear
glass heating grid lines, the following procedure is
required:
(1) Turn the ignition switch to the On position.
Turn the rear window defogger system on. The rear
window defogger switch LED indicator should light.
If OK, go to Step 2. If not OK, (Refer to 8 - ELEC-
TRICAL/HEATED GLASS/REAR WINDOW DEFOG-
GER RELAY - DIAGNOSIS AND TESTING).
(2) Using a 12-volt DC voltmeter, contact the rear
glass heating grid vertical bus bar on the right side
of the vehicle with the negative lead. With the posi-
tive lead, contact the rear glass heating grid vertical
bus bar on the left side of the vehicle. The voltmeter
should read battery voltage. If OK, go to Step 3. If
not OK, repair the open rear window defogger relay
output circuit to the rear window defogger relay as
required.
(3) With the positive voltmeter lead still contacting
the rear glass heating grid vertical bus bar on the
left side of the vehicle, move the negative lead of the
voltmeter to a good body ground point. The voltage
reading should not change. If OK, go to Step 4. If not
OK, repair the ground circuit to ground as required.
(4) Connect the negative lead of the voltmeter to
the right side bus bar and touch each grid line at
midpoint C with the positive lead (Fig. 2). A reading
of approximately six volts indicates a line is good. A
reading of zero volts indicates a break in the grid
line between midpoint C and the left side rear glass
heating grid bus bar. A reading of ten to fourteen
WJHEATED GLASS 8G - 3
HEATED GLASS (Continued)

HEATED MIRRORS
TABLE OF CONTENTS
page page
HEATED MIRRORS
DESCRIPTION..........................8
OPERATION............................8DIAGNOSIS AND TESTING - HEATED
MIRRORS............................8
HEATED MIRRORS
DESCRIPTION
Electrically heated outside rear view mirrors are
optional equipment on this model. These mirrors fea-
ture an electric heating grid located behind the mir-
ror glass of each power operated outside rear view
mirror. These heating grids consist of a single resis-
tor wire routed in a grid-like pattern and captured
between two thin sheets of plastic. When electrical
current is passed through the resistor wire, it pro-
duces enough heat energy to clear the outside mirror
glass of ice, snow or fog. Battery current is directed
to the outside mirror heating grid only when the rear
window defogger switch is in the On position.
If the outside mirror heating grids and the rear
window heating grid are all inoperative, (Refer to 8 -
ELECTRICAL/HEATED GLASS - DIAGNOSIS AND
TESTING - REAR WINDOW DEFOGGER SYSTEM).
If the outside mirror heating grids are inoperative,
but the rear window heating grid is operating as
designed, (Refer to 8 - ELECTRICAL/HEATED MIR-
RORS - DIAGNOSIS AND TESTING)
The heating grid behind each outside mirror glass
cannot be repaired and, if faulty or damaged, the
entire power mirror unit must be replaced. Refer to
Power Mirrors for the procedures.
OPERATION
The outside mirror heating grids are energized and
de-energized by the Driver Door Module (DDM) and
the Passenger Door Module (PDM) based upon the
rear window defogger switch status. The Body Con-
trol Module (BCM) monitors the rear window defog-ger switch. When the BCM receives an input from
the switch, it sends a defogger switch status message
to the DDM and the PDM over the Programmable
Communications Interface data bus. The DDM and
PDM respond to the defogger switch status messages
by energizing or de-energizing the battery current
feed to their respective outside rear view mirror
heating grids.
DIAGNOSIS AND TESTING - HEATED MIRRORS
For circuit descriptions and diagrams, (Refer to
Appropriate Wiring Information).
(1) If both mirror heaters are inoperative, check
for proper operation of the Rear Window Defogger
System. (Refer to 8 - ELECTRICAL/HEATED GLASS
- DIAGNOSIS AND TESTING - REAR WINDOW
DEFOGGER SYSTEM). If Rear Window Defogger
System operates correctly, or if only one mirror
heater is inoperative, go to Step 2.
(2) Disconnect and isolate the battery negative
cable. Remove the front door trim panel on the side
of the inoperative mirror heater. Go to Step 3.
(3) Disconnect the door wire harness connector
from the door module connector receptacle. Check for
continuity between the mirror heater 12 volt supply,
and the mirror heater ground. There should be con-
tinuity. If OK, go to Step 4. If not OK, check for con-
tinuity of the individual circuits between the power
mirror and the door module, and of the mirror heater
grid right at the power mirror.
(4) Use a DRB IIItand (Refer to Appropriate
Diagnostic Information) to test the door module and
the PCI data bus.
8G - 8 HEATED MIRRORSWJ

nector for the multi-function switch. There should be
continuity. If OK, go to Step 11. If not OK, repair the
open hazard switch sense circuit between the multi-
function switch and the combination flasher.
(11) Check for continuity between the turn switch
sense circuit of the instrument panel wire harness
connector for the multi-function switch and a good
ground. There should be no continuity. If OK, go to
Step 12. If not OK, repair the shorted left turn
switch sense circuit between the multi-function
switch and the combination flasher.
(12) Check for continuity between the left turn
switch sense circuit of the JB for the combination
flasher and the instrument panel wire harness con-
nector for the multi-function switch. There should be
continuity. If OK, go to Step 13. If not OK, repair the
open left turn switch sense circuit between the multi-
function switch and the combination flasher.
(13) Check for continuity between the right turn
switch sense circuit of the instrument panel wire
harness connector for the left multi-function switch
and a good ground. There should be no continuity. If
OK, go to Step 14. If not OK, repair the shorted right
turn switch sense circuit between the left multi-func-
tion switch and the combination flasher.
(14) Check for continuity between the right turn
switch sense circuit of the JB for the combination
flasher and the instrument panel wire harness con-
nector for the multi-function switch. There should be
continuity. If OK, test the left multi-function switch.
(Refer to 8 - ELECTRICAL/LAMPS/LIGHTING -
EXTERIOR/LEFT MULTI-FUNCTION SWITCH -
DIAGNOSIS AND TESTING). If not OK, repair the
open right turn switch sense circuit between the
multi-function switch and the combination flasher as
required.
SPECIFICATIONS
EXTERIOR LAMPS
CAUTION: Do not use bulbs other than the bulbs
listed in the Bulb Application Table. Damage to
lamp can result. Do not touch halogen bulbs with
fingers or other oily surfaces. Bulb life will be
reduced.
LAMP BULB TYPE
BACK-UP 3157
CENTER HIGH
MOUNTED STOP LAMP921
FOG LAMP 9005
FRONT SIDE MARKER 194/194NA
LAMP BULB TYPE
FRONT TURN SIGNAL 3157/3157NA
HIGH BEAM 9005XS
LOW BEAM 9006XS
LICENSE PLATE 168
TAIL/BRAKE 3157
REAR TURN SIGNAL 3157
UNDERHOOD LAMP 561
AUTO HEADLAMP SENSOR
DIAGNOSIS AND TESTING - AUTO HEADLAMP
SENSOR (AHL)
The auto headlamp sensor needs real sunlight to
properly register the light level. When auto head-
lamps are enabled indoors, the headlamps may be
turned on. The sensor is located in the center of the
defroster grille at the base of the windshield. There
are no faults set in the Body Control Module (BCM)
for a inoperative or missing AHL Sensor. Symptom of
a missing sensor or unconnected sensor would be
that the Headlamps and Parklamps turn on when
the vehicle is started and there is a high level of
ambient light present (ie. daytime). Auto headlamps
should not function in the presence of daylight.
REMOVAL
(1) Remove the instrument panel top cover. (Refer
to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP COVER - REMOVAL) for service proce-
dures.
(2) Remove the screw attaching auto headlamp
sensor to instrument panel (Fig. 1).
(3) Disengage the harness connector from auto
headlamp sensor.
(4) Separate the auto headlamp sensor from
instrument panel.
INSTALLATION
(1) Position the auto headlamp sensor on instru-
ment panel.
(2) Engage the harness connector to auto head-
lamp sensor.
(3) Install the screw attaching auto headlamp sen-
sor to instrument panel.
(4) Install the instrument panel top cover. (Refer
to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP COVER - INSTALLATION) for service
procedures.
8L - 4 LAMPS/LIGHTING - EXTERIORWJ
LAMPS/LIGHTING - EXTERIOR (Continued)

INSTALLATION - BULB
CAUTION: Do not touch the bulb glass with fingers
or other oily surfaces. Reduced bulb life will result.
(1) Position the bulb into socket and push into
place.
(2) Position the bulb socket in headlamp and turn
the bulb socket one quarter turn clockwise.
(3) Install the headlamp.
HEADLAMP SWITCH
DESCRIPTION
The headlamp switch is part of the left multi-func-
tion switch. A knob on the end of the multi-function
switch control stalk controls all of the exterior light-
ing switch functions. The exterior lighting switch is
hard wired to the Body Control Module (BCM).
The exterior lighting switch cannot be adjusted or
repaired and, if faulty or damaged, the entire left
multi-function switch unit must be replaced. (Refer
to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERI-
OR/TURN SIGNAL/HAZARD SWITCH - REMOVAL)
for the service procedures. (Refer to 8 - ELECTRI-
CAL/ELECTRONIC CONTROL MODULES/BODY
CONTROL/CENTRAL TIMER MODUL - DESCRIP-
TION) for more information on this component.
OPERATION
The exterior lighting switch uses a hard wired five
volt reference circuit from the BCM, resistor multi-
plexing and a hard wired switch output circuit to
provide the BCM with a zero to five volt signal thatindicates the status of all of the exterior lighting
switch settings. The BCM then uses control outputs
to energize the headlamp and park lamp relays that
activate the exterior lighting circuits.
The BCM monitors the exterior lighting switch sta-
tus, then sends the proper switch status messages to
other modules over the Programmable Communica-
tions Interface (PCI) data bus network. The exterior
lighting switch status is also used by the BCM as an
input for chime warning system operation.
DIAGNOSIS AND TESTING Ð HEADLAMP
SWITCH
Before testing the headlamp switch, turn on the
exterior lighting and open the driver side front door.
If the exterior lamps of the vehicle operate, but there
is no chime warning issued with the driver side front
door open, (Refer to 8 - ELECTRICAL/LAMPS/
LIGHTING - INTERIOR/DOOR AJAR SWITCH -
DIAGNOSIS AND TESTING). If the exterior lamps
of the vehicle are inoperative, but the chime warning
is issued, (Refer to 8 - ELECTRICAL/LAMPS/LIGHT-
ING - EXTERIOR - DIAGNOSIS AND TESTING).
If the exterior lamps and the chime warning are
both inoperative, test the left multi-function switch.
(Refer to 8 - ELECTRICAL/LAMPS/LIGHTING -
EXTERIOR - DIAGNOSIS AND TESTING). If the
multi-function switch tests OK, proceed as follows.
The following tests will help to locate a short or open
in the hard wired circuits between the multi-function
switch and the Body Control Module (BCM). For
complete circuit diagrams, refer to the appropriate
wiring information.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Disconnect and isolate the battery negative
cable. Disconnect the instrument panel wire harness
connector from the left multi-function switch connec-
tor. Disconnect the instrument panel wire harness
connector from the Body Control Module (BCM).
Check for continuity between the headlamp switch
mux circuit of the instrument panel wire harness
connector for the multi-function switch and a good
ground. There should be no continuity. If OK, go to
Step 2. If not OK, repair the shorted headlamp
switch mux circuit.
(2) Check for continuity between the headlamp
switch mux circuit of the instrument panel wire har-
Fig. 13 Headlamp Bulb
1 - HIGH BEAM BULB
2 - LOW BEAM BULB
3 - MARKER BULB
4 - PARK/TURN SIGNAL BULB
WJLAMPS/LIGHTING - EXTERIOR 8L - 15
HEADLAMP (Continued)

LAMPS/LIGHTING - INTERIOR
TABLE OF CONTENTS
page page
LAMPS/LIGHTING - INTERIOR
SPECIFICATIONS
...................................28
COURTESY LAMP
REMOVAL
REMOVAL - BULB.....................29
REMOVAL - LAMP.....................29
INSTALLATION
INSTALLATION - BULB.................29
INSTALLATION - LAMP.................29
DOME LAMP
REMOVAL
REMOVAL - BULB.....................29
REMOVAL - LAMP.....................29
INSTALLATION
INSTALLATION - BULB.................29
INSTALLATION - LAMP.................29
DOOR AJAR SWITCH
DESCRIPTION
DESCRIPTION - DOOR AJAR SWITCH.....29
DESCRIPTION - FLIP UP GLASS AJAR
SWITCH............................29DESCRIPTION - LIFTGATE AJAR SWITCH . . 30
OPERATION
OPERATION - DOOR AJAR SWITCH.......30
OPERATION - FLIP UP GLASS AJAR
SWITCH............................30
OPERATION - LIFTGATE AJAR SWITCH....30
DIAGNOSIS AND TESTING - DOOR AJAR
SWITCH............................30
GLOVE BOX LAMP/SWITCH
REMOVAL.............................31
INSTALLATION.........................31
READING LAMP
DESCRIPTION.........................32
OPERATION...........................32
REMOVAL.............................32
INSTALLATION.........................32
TRANS RANGE INDICATOR ILLUMINATION
DESCRIPTION.........................32
VANITY LAMP
REMOVAL.............................32
INSTALLATION.........................32
LAMPS/LIGHTING - INTERIOR
SPECIFICATIONS
CAUTION: Do not use bulbs other than the bulbs
listed in the Bulb Application Table. Damage to
lamp can result.
Service procedures for most of the lamps in the
instrument panel, are located in Electrical, Instru-
ment Panel. Some components have lamps that can
only be serviced by an Authorized Service Center
(ASC) after the component is removed from the vehi-
cle.
LAMP BULB TYPE
A/C HEATER NOT SERVICED
ASH RECEIVER 161
CLIMATE CONTROL 74
PASSENGER ASSIST
HANDLE214±2
FRONT READING 192
GLOVE COMPARTMENT 194
TELLTALE/HAZARD LAMP 74
HEATER NOT SERVICED
OVERHEAD CONSOLE 192
RADIO ASC
REAR CARGO 214±2
UNDER PANEL COURTESY 906
CLUSTER ILLUMINATION 103
SUNVISOR VANITY CHRYSLER P/N
6501966
8L - 28 LAMPS/LIGHTING - INTERIORWJ

COURTESY LAMP
REMOVAL
REMOVAL - BULB
(1) Remove the door trim panel. (Refer to 23 -
BODY/DOOR - FRONT/TRIM PANEL - REMOVAL)
for the service procedures.
(2) Remove the bulb socket from the lamp.
(3) Remove the bulb from the socket.
REMOVAL - LAMP
(1) Remove door trim panel. (Refer to 23 - BODY/
DOOR - FRONT/TRIM PANEL - REMOVAL) for the
procedures.
(2) Disengage the electrical connectors.
(3) Depress the locking tabs and remove the lamp
module.
(4) Remove the bulb socket.
INSTALLATION
INSTALLATION - BULB
(1) Install the bulb in the socket.
(2) Install the bulb socket in the lamp.
(3) Install the door trim panel.
INSTALLATION - LAMP
(1) Install the bulb socket into the lamp module.
(2) Align the lamp module with the door trim
panel.
(3) Snap the lamp module into place.
(4) Install the door panel.
DOME LAMP
REMOVAL
REMOVAL - BULB
(1) Rotate the the grab handle down.
(2) Remove the screws retaining the grab handle/
dome lens.
(3) Remove the grab handle/lens from the module.
(4) Remove the bulb from the lamp terminals.
REMOVAL - LAMP
It will be necessary to partially remove the head-
liner to remove the bulb socket.
(1) Remove the screws holding the grab handle/
lens assembly to the headliner and roof panel.(2) Lower the headliner as needed. (Refer to 23 -
BODY/INTERIOR/HEADLINER - REMOVAL) for the
service procedure.
(3) Separate the lamp socket from the headliner
and roof panel.
(4) Disconnect the wire connector.
INSTALLATION
INSTALLATION - BULB
(1) Insert the bulb into the lamp terminals.
(2) Position the grab handle/lens on the lamp mod-
ule.
(3) Install the screws retaining the grab handle/
lens to the lamp module.
INSTALLATION - LAMP
(1) Position the lamp socket on the headliner and
roof panel.
(2) Connect the wire harness.
(3) Install the headliner.
(4) Position the grab handle/lens on the lamp mod-
ule.
(5) Install the screws retaining the grab handle/
lens into the lamp socket.
DOOR AJAR SWITCH
DESCRIPTION
DESCRIPTION - DOOR AJAR SWITCH
The door ajar switches are integral to the door
latch mechnicism. The front door ajar switches are
actuated by the front door latch mechanisms, and are
hard wired between a body ground and the Driver
Door Module (DDM) or the Passenger Door Module
(PDM). The rear door ajar switches are actuated by
the rear door latch mechanisms, and are hard wired
between a body ground and the Body Control Module
(BCM) through the rear door and body wire har-
nesses.
The door ajar switches cannot be adjusted or
repaired and, if faulty or damaged, the door latch
unit must be replaced. (Refer to 23 - BODY/DOOR -
FRONT/LATCH - REMOVAL) or (Refer to 23 -
BODY/DOORS - REAR/LATCH - REMOVAL) for the
service procedures. For complete circuit diagrams,
refer to the appropriate wiring information.
DESCRIPTION - FLIP UP GLASS AJAR SWITCH
The liftgate flip-up glass ajar switch is integral to
the liftgate flip-up glass latch mechnicism. The lift-
gate flip-up glass ajar switch is actuated by the lift-
gate flip-up glass latch mechanism, and is hard
WJLAMPS/LIGHTING - INTERIOR 8L - 29

wired between a body ground, the Body Control Mod-
ule (BCM) and the rear wiper motor module through
the liftgate and body wire harnesses.
The liftgate flip-up glass ajar switch cannot be
adjusted or repaired and, if faulty or damaged, the
liftgate flip-up glass latch unit must be replaced.
(Refer to 23 - BODY/DECKLID/HATCH/LIFTGATE/
TAILGATE/FLIP-UP GLASS LATCH - REMOVAL)
for the service procedures. For complete circuit dia-
grams, refer to the appropriate wiring information.
DESCRIPTION - LIFTGATE AJAR SWITCH
The two liftgate ajar switches are integral to the
two liftgate latch mechanisms. The two liftgate ajar
switches are actuated by the liftgate latch mecha-
nisms, and are hard wired with each other between a
body ground and the Body Control Module (BCM)
through the liftgate and body wire harnesses.
The liftgate ajar switches cannot be adjusted or
repaired and, if faulty or damaged, the liftgate latch
unit must be replaced. (Refer to 23 - BODY/DECK-
LID/HATCH/LIFTGATE/TAILGATE/LATCH -
REMOVAL) for the service procedures. For complete
circuit diagrams, refer to the appropriate wiring
information.
OPERATION
OPERATION - DOOR AJAR SWITCH
The front door ajar switches close a path to ground
for the DDM or the PDM when a front door is
opened, and opens the ground path when a front door
is closed. The rear door ajar switches close a path to
ground for the BCM when a rear door is opened, and
opens the ground path when a rear door is closed.
The DDM, PDM, or BCM read the switch status then
send the proper switch status messages to other
modules over the Programmable Communications
Interface (PCI) data bus network. The door ajar
switch status message is used by the BCM as an
input for Vehicle Theft Security System (VTSS) oper-
ation.
OPERATION - FLIP UP GLASS AJAR SWITCH
The liftgate flip-up glass ajar switch can close a
path to ground for the BCM and the rear wiper
motor module when the liftgate flip-up glass is
opened, and opens the ground path when the liftgate
flip-up glass is closed. The rear wiper motor module
uses the liftgate flip-up glass ajar switch input to
control the rear wiper operation, and will park the
rear wiper blade if this input indicates that the lift-
gate flip-up glass is ajar. The BCM reads the switch
status then sends the proper switch status message
to other modules over the Programmable Communi-cations Interface (PCI) data bus network. The liftgate
flip-up glass ajar switch status message is used by
the BCM as an input for Vehicle Theft Security Sys-
tem (VTSS) operation.
OPERATION - LIFTGATE AJAR SWITCH
Each of the liftgate ajar switches can close a path
to ground for the BCM when the liftgate is opened,
and opens the ground path when the liftgate is
closed. The BCM reads the switch status then sends
the proper switch status message to other modules
over the Programmable Communications Interface
(PCI) data bus network. The liftgate ajar switch sta-
tus message is used by the BCM as an input for
Vehicle Theft Security System (VTSS) operation.
DIAGNOSIS AND TESTING - DOOR AJAR
SWITCH
The following diagnosis and testing is only
for the chime functions. For interior lamp diag-
nosis, refer to the appropriate wiring informa-
tion.The driver door ajar switch is hard wired to the
Driver Door Module (DDM). The DDM communicates
the switch status to the other modules in the vehicle
on the Programmable Communications Interface
(PCI) data bus network. The following test will diag-
nose a faulty driver door ajar switch and circuits. For
complete circuit diagrams, refer to the appropriate
wiring information.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Check that the interior lighting switch on the
control stalk of the left multi-function switch is not
in the dome lamp disable position. Open the driver
side front door and note whether the interior lamps
light. They should light. If OK, refer to Key-In Igni-
tion Switch in the Diagnosis and Testing section of
this group for further diagnosis of the chime warning
system. If not OK, go to Step 2.
(2) Disconnect and isolate the battery negative
cable. Remove the trim panel from the driver front
door and disconnect the 4-way door wire harness con-
nector from the front door latch connector. Check for
continuity between the ground circuit of the 4-way
door wire harness connector and a good ground.
There should be continuity. If OK, go to Step 3. If not
OK, repair the ground circuit.
8L - 30 LAMPS/LIGHTING - INTERIORWJ
DOOR AJAR SWITCH (Continued)

(3) Disconnect the door wire harness connector
from the Driver Door Module (DDM) connector.
Check for continuity between the driver door ajar
switch sense circuit of the door wire harness connec-
tor for the DDM and a good ground. There should be
no continuity. If OK, go to Step 4. If not OK, repair
the shorted driver door ajar switch sense circuit.
(4) Check for continuity between the driver door
ajar switch sense circuit of the door wire harness
connector for the DDM and the 4-way door wire har-
ness connector for the front door latch. There should
be continuity. If OK, go to Step 5. If not OK, repair
the open driver door ajar switch sense circuit.
(5) Check for continuity between the ground cir-
cuit terminal and the driver door ajar switch sense
circuit terminal of the front door latch connector.
There should be continuity with the driver side front
door open, and no continuity with the door closed. If
OK, use a DRBIIItscan tool and the proper Diagnos-
tic Procedures manual to test the operation of the
PCI data bus and the DDM. If not OK, replace the
faulty driver side front door latch unit.
GLOVE BOX LAMP/SWITCH
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Disconnect and isolate the battery negative
cable.
(2) Roll down the glove box from the instrument
panel.(Refer to 23 - BODY/INSTRUMENT PANEL/
GLOVE BOX - REMOVAL) for the procedures.
(3) Remove the lower right center bezel from the
instrument panel.(Refer to 23 - BODY/INSTRU-
MENT PANEL - REMOVAL) for the procedures.
(4) Reach through the glove box opening and
depress the retaining latches on the top and bottom
of the glove box lamp and switch housing.
(5) While holding the retaining latches depressed,
push the glove box lamp and switch out through the
mounting hole (Fig. 1).
(6) Disconnect the instrument panel wire harness
connector from the glove box lamp and switch con-
nector.
(7) Remove the glove box lamp and switch.
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Position the glove box lamp and switch to the
instrument panel.
(2) Reconnect the instrument panel wire harness
connector to the glove box lamp and switch connector.
(3) Align the glove box lamp and switch housing
with the mounting hole in the instrument panel
glove box opening upper reinforcement.
(4) Push the glove box lamp and switch into the
mounting hole until the retaining latches are fully
engaged.
(5) Install the lower right center bezel onto the
instrument panel. (Refer to 23 - BODY/INSTRU-
MENT PANEL - INSTALLATION) for the proce-
dures.
(6) Roll the glove box back up into the instrument
panel.(Refer to 23 - BODY/INSTRUMENT PANEL/
GLOVE BOX - INSTALLATION) for the procedures.
(7) Reconnect the battery negative cable.
Fig. 1 Glove Box Lamp and Switch Remove/Install
1 - GLOVE BOX OPENING UPPER REINFORCEMENT
2 - WIRE HARNESS CONNECTOR
3 - GLOVE BOX LAMP & SWITCH
4-LATCH
5 - MOUNTING HOLE
WJLAMPS/LIGHTING - INTERIOR 8L - 31
DOOR AJAR SWITCH (Continued)

READING LAMP
DESCRIPTION
The overhead console in this vehicle is equipped
with two individual reading and courtesy lamps.Each
lamp has its own switch, bulb, reflector and lens; but
both lamps share a common lamp housing within the
overhead console.
The overhead console reading and courtesy lamps
operate on battery current that is provided at all
times, regardless of the ignition switch position. The
ground feed for the lamps is switched through the
integral reading and courtesy lamp switches or
through the door jamb switches.
The reading and courtesy lamp lenses and the
lamp housing and reflector unit are serviced only as
a unit with the overhead console housing.The reading
and courtesy lamp switches, bulb holders and wiring
are only available as part of the overhead console
wire harness.
For service of the reading and courtesy lamp bulbs,
(Refer to 8 - ELECTRICAL/LAMPS/LIGHTING -
INTERIOR/READING LAMP - REMOVAL). For diag-
nosis of the reading and courtesy lamps, refer to the
appropriate wiring information.
OPERATION
All reading and courtesy lamps located in the over-
head console are activated by the door jamb switches.
When all of the doors are closed, these lamps can be
individually activated by depressing the correspond-
ing lens. When any door is open, depressing the lamp
lenses to activate the lamp switches will not turn the
lamps off.
REMOVAL
(1) Remove the overhead console.
(2) Rotate the console until the bulb is visible (Fig.
2).
(3) Grasp the bulb and remove from the socket.
INSTALLATION
(1) Push the bulb into the bulb socket.
(2) Install the console on the headliner and roof
panel.
(3) Align the screw hole and install the screw.
TRANS RANGE INDICATOR
ILLUMINATION
DESCRIPTION
The Transmission Range Indicator Lamp, mounted
on the floor console, uses electroluminescent technol-ogy as the light source. This lamp requires a 120 volt
AC signal that is provided by a power converter
included as part of the assembly. The module is not
serviceable separately. Because of a potential shock
hazard, diagnostic testing of the lamp assembly
should be avoided. Refer to TRANSMISSION, Range
Selector Assembly Removal and Installation.
VANITY LAMP
REMOVAL
(1) Fold down the visor.
(2) Using a small flat blade, and staring at the
base of the lamp assembly, carefully pry the base of
the lamp from the visor.
(3) Disconnect the vanity lamp visor and remove
the lamp from the vehicle.
INSTALLATION
(1) Position the lamp at the visor and connect the
wire connector.
(2) Press the lamp in place.
Fig. 2 Overhead Console Reading Lamp Bulb
1 - BULB
8L - 32 LAMPS/LIGHTING - INTERIORWJ