2003 JEEP GRAND CHEROKEE no start

INSTRUMENT PANEL SYSTEM
REMOVAL
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 ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
NOTE: Before starting this procedure, be certain to
turn the steering wheel until the front wheels are in
the straight-ahead position.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the trim from the right and left A-pil-
lars. (Refer to 23 - BODY/INTERIOR/A-PILLAR
TRIM - REMOVAL).(3) Remove the top cover from the instrument
panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
INSTRUMENT PANEL TOP COVER - REMOVAL).
(4) Remove the four nuts that secure the instru-
ment panel to the studs on the dash panel near the
windshield fence line (Fig. 1).
(5) Remove the scuff plates from the right and left
front door sills. (Refer to 23 - BODY/INTERIOR/
DOOR SILL SCUFF PLATE - REMOVAL).
(6) Remove the trim panels from the right and left
inner cowl sides. (Refer to 23 - BODY/INTERIOR/
COWL TRIM - REMOVAL).
(7) Remove the console from the floor panel trans-
mission tunnel. (Refer to 23 - BODY/INTERIOR/
FLOOR CONSOLE - REMOVAL).
(8) Remove the fuse cover from the Junction Block
(JB). (Refer to 8 - ELECTRICAL/POWER DISTRIBU-
TION/FUSE COVER - REMOVAL).
(9) Remove the cluster bezel from the instrument
panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
CLUSTER BEZEL - REMOVAL).
(10) Remove the steering column opening cover
from the instrument panel. (Refer to 23 - BODY/IN-
STRUMENT PANEL/STEERING COLUMN OPEN-
ING COVER - REMOVAL).
(11) Remove the steering column bracket from the
instrument panel steering column support bracket.
(Refer to 23 - BODY/INSTRUMENT PANEL/IP
STEERING COLUMN BRACKET - REMOVAL).
Fig. 1 Instrument Panel to Dash Panel Mounting
1 - STUD (4)
2 - NUT (4)3 - INSTRUMENT PANEL
4 - DASH PANEL
WJINSTRUMENT PANEL SYSTEM 23 - 37

INTERIOR
TABLE OF CONTENTS
page page
A-PILLAR TRIM
REMOVAL.............................69
INSTALLATION.........................69
ASSIST HANDLE
REMOVAL.............................70
INSTALLATION.........................70
B-PILLAR LOWER TRIM
REMOVAL.............................70
INSTALLATION.........................70
B-PILLAR UPPER TRIM
REMOVAL.............................71
INSTALLATION.........................71
CARPETS AND FLOOR MATS
REMOVAL
REMOVAL - FRONT CARPET............71
REMOVAL - CARGO AREA CARPET.......71
INSTALLATION
INSTALLATION - FRONT CARPET.........71
INSTALLATION - CARGO AREA CARPET . . . 72
COWL TRIM
REMOVAL.............................72
INSTALLATION.........................72
C-PILLAR TRIM
REMOVAL.............................72
INSTALLATION.........................72
DOOR SILL SCUFF PLATE
REMOVAL.............................74
INSTALLATION.........................74
DOOR SILL TRIM
REMOVAL.............................74INSTALLATION.........................74
D-PILLAR TRIM
REMOVAL.............................75
INSTALLATION.........................75
FLOOR CONSOLE
REMOVAL.............................76
INSTALLATION.........................76
HEADLINER
REMOVAL.............................77
INSTALLATION.........................77
LIFTGATE OPENING UPPER TRIM
REMOVAL.............................79
INSTALLATION.........................79
QUARTER TRIM PANEL
REMOVAL.............................79
INSTALLATION.........................79
REAR STORAGE BOX
REMOVAL.............................79
INSTALLATION.........................80
REAR VIEW MIRROR
REMOVAL.............................80
INSTALLATION
INSTALLATION.......................80
INSTALLATION - REARVIEW MIRROR
SUPPORT BRACKET...................80
SUN VISOR
REMOVAL.............................80
INSTALLATION.........................80
A-PILLAR TRIM
REMOVAL
The A-pillar trim is attached to the A-pillar with
spring clips.
(1) Grasp A-pillar trim and pull trim outward from
A-pillar (Fig. 1).
(2) Separate A-pillar trim from A-pillar.
INSTALLATION
(1) Position A-pillar trim on A-pillar and, starting
at the bottom, press into place (Fig. 1).
(2) Using a trim stick or other suitable tool, care-
fully cover the edge of the trim with weatherstrip.
Fig. 1 A-Pillar Trim
1 - A-PILLAR TRIM
2 - A-PILLAR
3 - SPRING CLIP
WJINTERIOR 23 - 69

INSTALLATION
NOTE: Sunroof glass must be set in place and
attached as close as possible to flush with the roof
surface. For wind noise reasons, care must be
taken to ensure that the glass is not remounted
either a) Overflush to the roof surface at the front
edge of the glass, or b) Underflush to the roof sur-
face at the rear edge of the glass.
(1) Position glass panel in to opening.
(2) Start the four attaching screws.
(3) Tighten screws.
(4) Verify sunroof operation and alignment. Check
fit and adjust as necessary. (Refer to 23 - BODY/
SUNROOF/GLASS PANEL - ADJUSTMENTS - FIT)
ADJUSTMENTS
ADJUSTMENTS - FIT
(1) Move the sunshade rearward to the open posi-
tion.
(2) Move the sunroof glass panel to the fully closed
position.
(3) Loosen the forward screws on each side enough
to make the front adjustment.
(4) Adjust the front of the sunroof glass panel 1
mm (1/32 inch) below the top surface of the roof
panel.
(5) Tighten the front two screws.
(6) Loosen the rear screws on each side enough to
make the rear adjustment.
(7) Adjust the rear of the sunroof glass panel 1
mm (1/32 inch) above the top surface of the roof
panel.
(8) Tighten the rear two screws.
(9) Check for proper fit. If not OK, repeat glass
panel adjustment.
ADJUSTMENT - TIMING
NOTE: A gage comes with the new motor.
(1) If the glass panel was not in the fully closed
position, when the motor was removed, the sunroof
glass panel needs to be timed, before the new motor
is installed.
(2) Remove sunroof glass panel.
(3) Set gage into the track near the rear of the
opening between the driver slide and the bracket
(Fig. 6).
(4) Move the driver slide forward or aft to get
proper setting.
(5) Repeat the operation on the other side.
(6) Install drive motor.
SUNSHADE
REMOVAL
(1) Open sunroof approximately 50% of the way.
(2) Push sunshade down until tabs clear glass.
(3) Move sunshade forward of glass panel.
(4) Compress the spring loaded plungers holding
the guide blocks in the track.
(5) Slide the sunshade forward while lifting the
front through the opening until the rear guide blocks
are accessible.
CAUTION: Use care not to crease the sunshade
when removing or installing.
(6) Disengage rear guide blocks from track.
INSTALLATION
(1) Install the sunshade from outside of the vehicle
with the sunroof fully open.
(2) Put rear guide blocks into sunshade guide
track.
(3) Push sunshade back and down through the
sunroof opening.
(4) Using a flat blade tool, put front guide blocks
into the sunshade track. By pushing the block
towards the center of the vehicle.
(5) Move the glass panel to approximately halfway
to the fully closed position.
Fig. 6 Sunroof Drive Cable Timing
1 - MOVE DRIVER SLIDE FORWARD/AFT
2 - GAGE
WJSUNROOF 23 - 103
GLASS PANEL (Continued)

(6) Push sunshade down until the sunshade clears
the glass then move sunshade rearward behind the
glass panel.
HOUSING ASSEMBLY
REMOVAL
(1) Move glass panel to the fully closed position.
(2) Disconnect battery negative cable.
(3) Recline both front seats.
(4) Remove headliner. (Refer to 23 - BODY/INTE-
RIOR/HEADLINER - REMOVAL)
(5) Disconnect the drain tubes from sunroof hous-
ing (Fig. 7).
(6) Loosen fasteners attaching sunroof housing
assembly.
(7) With the aid of a helper, remove fasteners
attaching sunroof housing assembly to roof panel.
INSTALLATION
(1) Raise the sunroof housing assembly and guide
into position and start fasteners (Fig. 7).
(2) Tighten the fasteners, front to rear, attaching
the sunroof module to roof panel. Tighten the fasten-
ers, front to rear, to 11 N´m (97 in. lbs.) torque.
(3) Connect the drain tubes to the sunroof housing.
(4) Set headliner into position.
(5) Connect express module, drive motor, and con-
trol switch wire connectors.
(6) Test sunroof operation, adjust as necessary.
(7) Finish installing the headliner. (Refer to 23 -
BODY/INTERIOR/HEADLINER - INSTALLATION)
(8) Connect battery negative cable.
Fig. 7 SUNROOF ASSEMBLY
1 - ROOF
2 - DRAIN HOSE
3 - CLAMP
4 - SUNROOF ASSEMBLY
5 - CLAMP
6 - DRAIN HOSE
23 - 104 SUNROOFWJ
SUNSHADE (Continued)

However, evaporator capacity used to reduce the
amount of moisture in the air is not wasted. Wring-
ing some of the moisture out of the air entering the
vehicle adds to the comfort of the passengers.
Although, an owner may expect too much from their
air conditioning system on humid days. A perfor-
mance test is the best way to determine whether the
system is performing up to standard. This test also
provides valuable clues as to the possible cause of
trouble with the air conditioning system.
If the vehicle has the optional Automatic Zone Control
(AZC) system, and has intermittent operational prob-
lems or fault codes, be certain that the wire harness
connectors on the HVAC housing are properly seated
(Fig. 2). To check this condition, unplug the two wire
harness connector halves, then plug them in again.
Before performing the following procedure, (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMB-
ING - CAUTION) (Refer to 24 - HEATING & AIR
CONDITIONING/PLUMBING - WARNING). The air
temperature in the test room and in the vehicle must
be a minimum of 21É C (70É F) for this test.
(1)
Connect a tachometer and a manifold gauge set.
(2) If the vehicle has the standard manual temper-
ature control, set the A/C Heater mode control switch
knob in the Panel position, the temperature control
knob in the full cool (Fresh Air Mode) position, the
A/C button in the On position, and the blower motor
switch knob in the highest speed position. If the vehi-
cle has the optional AZC, set the A/C Heater mode
control switch knob in the Panel position, the tem-
perature control knob in the full cool position, the
A/C button in the On position, and the blower motor
switch knob in the highest (manual) speed position.
(3) Start the engine and hold the idle at 1,300 rpm
with the compressor clutch engaged.
(4) The engine should be at operating temperature.
The doors and windows must be open.
(5)
Insert a thermometer in the driver side center
A/C (panel) outlet. Operate the engine for five minutes.
(6) The compressor clutch may cycle, depending
upon the ambient temperature and humidity.(7) With the compressor clutch engaged, record the
discharge air temperature and the compressor dis-
charge pressure.
(8) Compare the discharge air temperature to the
Performance Temperature and Pressure chart. If the
discharge air temperature is high, (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING -
DIAGNOSIS AND TESTING - REFRIGERANT SYS-
TEM LEAKS) and (Refer to 24 - HEATING & AIR
CONDITIONING/PLUMBING - STANDARD PRO-
CEDURE - REFRIGERANT SYSTEM CHARGE).
Performance Temperature and Pressure
Ambient Air Temperature
and Humidity21É C
(70É F @ 80%
humidity)27É C
(80É F @ 80%
humidity)32É C
(90É F @ 80%
humidity)38É C
(100ÉF@50%
humidity)43É C
110É F @ 20%
humidity)
Air Temperature at Center
Panel Outlet10 to 13É C
(50 to 55É F)14 to 17É C
(58 to 63É F)15 to 18É C
(60 to 65É F)17 to 20É C
(63 to 68É F)14 to 17É C
(58 to 63É F)
Evaporator Inlet Pressure
at Charge Port241 to 276 kPa
(35 to 40 psi)262 to 290 kPa
(38 to 42 psi)269 to 296 kPa
(39 to 43 psi)275 to 303 kPa
(40 to 44 psi)262 to 290 kPa
(38 to 42 psi)
Compressor Discharge
Pressure1241 to 1792
kPa
(180 to 260 psi)1380 to 1930
kPa
(200 to 280 psi)1380 to 1930
kPa
(200 to 280 psi)1655 to 2206
kPa
(240 to 320 psi)1567 to 2068
kPa
(220 to 300 psi)
Note: The discharge air temperatures will be lower if the humidity is less than the percentages shown.
Fig. 2 HVAC Housing - (rear view)
1 - Instrument Panel
2 - Air Intake
3 - Expansion Valve
4 - HVAC Housing
5 - Heater Core Input/Output Ports
6 - Instrument Panel Wiring Harness
7 - Blower Motor
WJHEATING & AIR CONDITIONING 24 - 3
HEATING & AIR CONDITIONING (Continued)

VACUUM RESERVOIR
DESCRIPTION.........................34
OPERATION...........................34
REMOVAL.............................35
INSTALLATION.........................35EVAPORATOR TEMPERATURE SENSOR
DESCRIPTION.........................35
OPERATION...........................35
REMOVAL.............................35
INSTALLATION.........................35
CONTROLS
DIAGNOSIS AND TESTING - VACUUM SYSTEM
Vacuum control is used to operate the mode doors
in the standard equipment manual temperature con-
trol system HVAC housing. Testing of the A/C Heater
mode control switch operation will determine if the
vacuum and electrical controls are functioning. How-
ever, it is possible that a vacuum control system that
operates perfectly at engine idle (high engine vac-
uum) may not function properly at high engine
speeds or loads (low engine vacuum). This can be
caused by leaks in the vacuum system, or a faulty
vacuum check valve.
A vacuum system test will help to identify the
source of poor vacuum system performance or vac-
uum system leaks. Before starting this test, stop the
engine and make certain that the problem isn't a dis-
connected vacuum supply tube at the engine intake
manifold vacuum tap or the vacuum reservoir.
Use an adjustable vacuum test set (Special Tool
C-3707-B) and a suitable vacuum pump to test the
HVAC vacuum control system. With a finger placed
over the end of the vacuum test hose probe (Fig. 1),
adjust the bleed valve on the test set gauge to obtain
a vacuum of exactly 27 kPa (8 in. Hg.). Release and
block the end of the probe several times to verify that
the vacuum reading returns to the exact 27 kPa (8
in. Hg.) setting. Otherwise, a false reading will be
obtained during testing.
VACUUM CHECK VALVES
(1) Remove the vacuum check valve to be tested.
The valves are located in the (black) vacuum supply
tubes at either the engine intake manifold vacuum
tap, or on the bottom of the HVAC unit behind the
passenger front floor duct.
(2) Connect the test set vacuum supply hose to the
A/C Heater control side of the valve. When connected
to this side of the check valve, no vacuum should
pass and the test set gauge should return to the 27
kPa (8 in. Hg.) setting. If OK, go to Step 3. If not OK,
replace the faulty valve.
(3) Connect the test set vacuum supply hose to the
engine vacuum side of the valve. When connected to
this side of the check valve, vacuum should flow
through the valve without restriction. If not OK,
replace the faulty valve.
A/C HEATER CONTROL
(1) Connect the test set vacuum probe to the
HVAC vacuum supply (black) tube in the engine com-
partment. Position the test set gauge so that it can
be viewed from the passenger compartment.
(2) Place the A/C Heater mode control switch knob
in each mode position, one position at a time, and
pause after each selection. The test set gauge should
return to the 27 kPa (8 in. Hg.) setting shortly after
each selection is made. If not OK, a component or
vacuum line in the vacuum circuit of the selected
mode has a leak. See the procedure in Locating Vac-
uum Leaks.
CAUTION: Do not use lubricant on the switch ports
or in the holes in the plug, as lubricant will ruin the
vacuum valve in the switch. A drop of clean water
in the connector plug holes will help the connector
slide onto the switch ports.
Fig. 1 ADJUST VACUUM TEST BLEED VALVE -
TYPICAL
1 - VACUUM PUMP TOOL C-4289
2 - VACUUM TEST SET C-3707
3 - BLEED VALVE
4 - PROBE
24 - 10 CONTROLSWJ

A/C COMPRESSOR CLUTCH
DESCRIPTION
The compressor clutch assembly consists of a sta-
tionary electromagnetic coil, a hub bearing and pul-
ley assembly, and a clutch plate (Fig. 4). The
electromagnetic coil unit and the hub bearing and
pulley assembly are each retained on the nose of the
compressor front housing with snap rings. The clutch
plate is keyed to the compressor shaft and secured
with a bolt.
OPERATION
The compressor clutch components provide the
means to engage and disengage the compressor from
the engine serpentine accessory drive belt. When the
clutch coil is energized, it magnetically draws the
clutch into contact with the pulley and drives the
compressor shaft. When the coil is not energized, the
pulley freewheels on the clutch hub bearing, which is
part of the pulley. The compressor clutch and coil are
the only serviced parts on the compressor.
The compressor clutch engagement is controlled by
several components: the a/c switch on the a/c heater
control panel, the Automatic Zone Control (AZC) con-
trol module (if the vehicle is so equipped), the evap-
orator probe, the a/c high pressure transducer, the
a/c compressor clutch relay, the body control module
(BCM) and the Powertrain Control Module (PCM).
The PCM may delay compressor clutch engagement
for up to thirty seconds. Refer to Electronic Control
Modules for more information on the PCM controls.
DIAGNOSIS AND TESTING - COMPRESSOR
CLUTCH COIL
For circuit descriptions and diagrams, refer to the
appropriate wiring diagrams. The battery must be
fully-charged before performing the following tests.
Refer to Battery for more information.
(1) Connect an ammeter (0 to 10 ampere scale) in
series with the clutch coil terminal. Use a voltmeter
(0 to 20 volt scale) with clip-type leads for measuring
the voltage across the battery and the compressor
clutch coil.
(2) With the a/c heater mode control switch in any
a/c mode, the a/c heater control a/c switch in the ON
position, and the blower motor switch in the lowest
speed position, start the engine and run it at normal
idle.
(3) The compressor clutch coil voltage should read
within 0.2 volts of the battery voltage. If there is
voltage at the clutch coil, but the reading is not
within 0.2 volts of the battery voltage, test the clutch
coil feed circuit for excessive voltage drop and repair
as required. If there is no voltage reading at the
clutch coil, use a DRBIIItscan tool and the appro-
priate diagnostic information for testing of the com-
pressor clutch circuit. The following components
must be checked and repaired as required before you
can complete testing of the clutch coil:
²Fuses in the junction block and the Power Dis-
tribution Center (PDC)
²A/C heater mode control switch
²A/C compressor clutch relay
²A/C high pressure transducer
²A/C evaporator probe
²Powertrain Control Module (PCM)
²Body Control Module (BCM)
(4) The compressor clutch coil is acceptable if the
current draw measured at the clutch coil is 2.0 to 3.9
amperes with the electrical system voltage at 11.5 to
12.5 volts. This should only be checked with the work
area temperature at 21É C (70É F). If system voltage
is more than 12.5 volts, add electrical loads by turn-
ing on electrical accessories until the system voltage
drops below 12.5 volts.
(a) If the clutch coil current reading is four
amperes or more, the coil is shorted and should be
replaced.
(b) If the clutch coil current reading is zero, the
coil is open and should be replaced.
Fig. 4 COMPRESSOR CLUTCH - TYPICAL
1 - CLUTCH PLATE
2 - SHAFT KEY
3 - PULLEY
4 - COIL
5 - CLUTCH SHIMS
6 - SNAP RING
7 - SNAP RING
WJCONTROLS 24 - 13

gap should be between 0.35 to 0.65 millimeter (0.014
to 0.026 inch). If the proper air gap is not obtained,
add or subtract shims as needed until the desired air
gap is obtained.
(9) Install the compressor shaft bolt. Tighten the
bolt to 13 N´m (115 in. lbs.).
NOTE: The shims may compress after tightening
the shaft bolt. Check the air gap in four or more
places to verify the air gap is still correct. Spin the
pulley before performing a final check of the air
gap.
(10) To complete the installation, (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING/A/C
COMPRESSOR - INSTALLATION)
A/C COMPRESSOR CLUTCH
RELAY
DESCRIPTION
The compressor clutch relay is a International
Standards Organization (ISO) micro-relay. The termi-
nal designations and functions are the same as a con-
ventional ISO relay. However, the micro-relay
terminal orientation (footprint) is different, the cur-
rent capacity is lower, and the relay case dimensions
are smaller than those of the conventional ISO relay.
OPERATION
The compressor clutch relay is a electromechanical
device that switches battery current to the compres-
sor clutch coil when the Powertrain Control Module
(PCM) grounds the coil side of the relay. The PCM
responds to inputs from the a/c compressor switch on
the a/c heater control panel, the Automatic Zone Con-
trol (AZC) control module (if the vehicle is so
equipped), the a/c fin probe, and the a/c high pres-
sure transducer. (Refer to 24 - HEATING & AIR
CONDITIONING/CONTROLS/A/C COMPRESSOR
CLUTCH RELAY - DIAGNOSIS AND TESTING)
The compressor clutch relay is located in the Power
Distribution Center (PDC) in the engine compart-
ment. Refer to the PDC label for relay identification
and location.
The compressor clutch relay cannot be repaired
and, if faulty or damaged, it must be replaced.
DIAGNOSIS AND TESTING - A/C COMPRESSOR
CLUTCH RELAY
For circuit descriptions and diagrams, refer to the
appropriate wiring information.
The compressor clutch relay (Fig. 10) is located in
the Power Distribution Center (PDC). Refer to the
PDC label for relay identification and location.Remove the relay from the PDC to perform the fol-
lowing tests:
(1) A relay in the de-energized position should
have continuity between terminals 87A and 30, and
no continuity between terminals 87 and 30. If OK, go
to Step 2. If not OK, replace the faulty relay.
(2) Resistance between terminals 85 and 86 (elec-
tromagnet) should be 75   5 ohms. If OK, go to Step
3. If not OK, replace the faulty relay.
(3) Connect a battery to terminals 85 and 86.
There should now be continuity between terminals
30 and 87, and no continuity between terminals 87A
and 30. If OK, see the Relay Circuit Test procedure
in this group. If not OK, replace the faulty relay.
RELAY CIRCUIT TEST
For circuit descriptions and diagrams, refer to the
appropriate wiring information..
(1) The relay common feed terminal cavity (30) is
connected to fused battery feed. There should be bat-
tery voltage at the cavity for relay terminal 30 at all
times. If OK, go to Step 2. If not OK, repair the open
circuit to the fuse in the PDC as required.
(2) The relay normally closed terminal (87A) is not
used in this application. Go to Step 3.
(3) The relay normally open terminal cavity (87) is
connected to the compressor clutch coil. There should
be continuity between this cavity and the A/C com-
pressor clutch relay output circuit cavity of the com-
pressor clutch coil wire harness connector. If OK, go
to Step 4. If not OK, repair the open circuit as
required.
(4) The relay coil battery terminal (86) is con-
nected to the fused ignition switch output (run/start)
circuit. There should be battery voltage at the cavity
for relay terminal 86 with the ignition switch in the
On position. If OK, go to Step 5. If not OK, repair the
Fig. 10 A/C COMPRESSOR CLUTCH RELAY
30 - COMMON FEED
85 - COIL GROUND
86 - COIL BATTERY
87 - NORMALLY OPEN
87A - NORMALLY CLOSED
24 - 16 CONTROLSWJ
A/C COMPRESSOR CLUTCH (Continued)