2003 JEEP GRAND CHEROKEE lamp

WARNING: DO NOT LOOSEN THE RADIATOR
DRAINCOCK WITH THE SYSTEM HOT AND UNDER
PRESSURE. SERIOUS BURNS FROM THE COOL-
ANT CAN OCCUR.
(1) Drain sufficient coolant from the radiator to
decrease the level below the heater hose inlet. On
4.7L engines this requires complete draining.
(2) Remove the heater hose.
(3) Inspect the inlet for metal casting flash or
other restrictions.
NOTE: On 4.0L engines remove the pump from the
engine before removing restriction to prevent con-
tamination of the coolant with debris. . On 4.7L
engine remove the fitting from the timing chain
cover, If the restriction is in the timing chain cover,
remove the timing chain cover.
REMOVAL
The water pump on 4.7L engines is bolted directly
to the engine timing chain case/cover.
A gasket is used as a seal between the water pump
and timing chain case/cover.
The water pump can be removed without discharg-
ing the air conditioning system (if equipped).
(1) Disconnect negative battery cable from battery.
(2) Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE). Do not waste reusable
coolant. If solution is clean, drain coolant into a clean
container for reuse.
WARNING: CONSTANT TENSION HOSE CLAMPS
ARE USED ON MOST COOLING SYSTEM HOSES.
WHEN REMOVING OR INSTALLING, USE ONLY
TOOLS DESIGNED FOR SERVICING THIS TYPE OF
CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER
6094). SNAP-ON CLAMP TOOL (NUMBER HPC-20)
MAY BE USED FOR LARGER CLAMPS. ALWAYS
WEAR SAFETY GLASSES WHEN SERVICING CON-
STANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps. If replacement
is necessary, use only an original equipment clamp
with matching number or letter.
(3) Remove accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
(4) Remove lower radiator hose clamp and remove
lower hose at water pump.
(5) Remove seven water pump mounting bolts and
one stud bolt.CAUTION: Do not pry water pump at timing chain
case/cover. The machined surfaces may be dam-
aged resulting in leaks.
(6) Remove water pump and gasket. Discard gas-
ket.
CLEANING
Clean the gasket mating surface. Use caution not
to damage the gasket sealing surface.
INSPECTION
Inspect the water pump assembly for cracks in the
housing, Water leaks from shaft seal, Loose or rough
turning bearing or Impeller rubbing either the pump
body or timing chain case/cover.
INSTALLATION
(1) Clean gasket mating surfaces.
(2) Using a new gasket, position water pump and
install mounting bolts as shown. (Fig. 44). Tighten
water pump mounting bolts to 54 N´m (40 ft. lbs.)
torque.
(3) Spin water pump to be sure that pump impel-
ler does not rub against timing chain case/cover.
(4) Connect radiator lower hose to water pump.
(5) Install accessory drive belt (Refer to 7 - COOL-
ING/ACCESSORY DRIVE/DRIVE BELTS - INSTAL-
LATION).
Fig. 44 Water Pump Installation
1 - WATER PUMP
2 - TIMING CHAIN COVER
WJENGINE 7 - 49
WATER PUMP - 4.7L (Continued)

NOTE: On 4.0L engines remove the pump from the
engine before removing restriction to prevent con-
tamination of the coolant with debris. . On 4.7L
engine remove the fitting from the timing chain
cover, If the restriction is in the timing chain cover,
remove the timing chain cover.
REMOVAL
CAUTION: If the water pump is replaced because of
mechanical damage, the fan blades and viscous fan
drive should also be inspected. These components
could have been damaged due to excessive vibra-
tion.
The water pump impeller is pressed on the rear of
the pump shaft and bearing assembly. The water
pump is serviced only as a complete assembly.
NOTE: The water pump can be replaced without
discharging the A/C system.
WARNING: DO NOT REMOVE THE BLOCK DRAIN
PLUG(S) OR LOOSEN RADIATOR DRAINCOCK
WITH THE SYSTEM HOT AND UNDER PRESSURE.
SERIOUS BURNS FROM COOLANT CAN OCCUR.
DO NOT WASTE reusable coolant. If the solution
is clean, drain coolant into a clean container for
reuse.
(1) Disconnect negative battery cable at battery.
(2) Drain the cooling system (Refer to 7 - COOL-
ING - STANDARD PROCEDURE).
(3) The thermal viscous fan drive is attached
(threaded) to the water pump hub shaft. Remove fan/
viscous fan drive assembly from water pump by turn-
ing mounting nut counterclockwise as viewed from
front. Threads on viscous fan drive areRIGHT
HANDDo not attempt to remove fan/viscous fan
drive assembly from vehicle at this time.
(4) If water pump is being replaced, do not unbolt
fan blade assembly from thermal viscous fan drive.
(5) Remove fan shroud-to-radiator nuts (Fig. 46).
Do not attempt to remove fan shroud at this time.
(6) Remove fan shroud and fan blade/viscous fan
drive assembly from vehicle as a complete unit.
(7) After removing fan blade/viscous fan drive
assembly,do notplace thermal viscous fan drive in
horizontal position. If stored horizontally, silicone
fluid in viscous fan drive could drain into its bearing
assembly and contaminate lubricant.
Loosen but do not remove the water pump pulley
mounting bolts.Remove accessory drive belt (Refer to 7 - COOL-
ING/ACCESSORY DRIVE/DRIVE BELTS - REMOV-
AL).
Remove the water pump pulley.
(8) Remove the idler pulley (located over the water
pump).
WARNING: CONSTANT TENSION HOSE CLAMPS
ARE USED ON MOST COOLING SYSTEM HOSES.
WHEN REMOVING OR INSTALLING, USE ONLY
TOOLS DESIGNED FOR SERVICING THIS TYPE OF
CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER
6094) (Fig. 47) SNAP-ON CLAMP TOOL (NUMBER
HPC-20) MAY BE USED FOR LARGER CLAMPS.
ALWAYS WEAR SAFETY GLASSES WHEN SERVIC-
ING CONSTANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps (Fig. 48). If
replacement is necessary, use only an original
equipment clamp with matching number or letter.
(9) Remove lower radiator hose from water pump.
Remove heater hose from water pump fitting.
(10) Remove the five pump mounting bolts (Fig.
49) and remove pump from vehicle. Discard old gas-
ket. Note that one of the five bolts is longer than the
other bolts.
(11) If pump is to be replaced, the heater hose fit-
ting must be removed. Note position of fitting before
removal.
Fig. 46 Fan Shroud Mounting
1 - SHROUD FASTENERS
2 - DRAIN COCK
3 - RADIATOR FAN SHROUD
4 - SHROUD FASTENERS
WJENGINE 7 - 51
WATER PUMP - 4.0L (Continued)

CLEANING
Clean the gasket mating surface. Use caution not
to damage the gasket sealing surface.
INSPECTION
Inspect the water pump assembly for cracks in the
housing, Water leaks from shaft seal, Loose or rough
turning bearing or Impeller rubbing either the pump
body or timing chain case/cover.
INSTALLATION
CAUTION: If the water pump is replaced because of
mechanical damage, the fan blades and viscous fan
drive should also be inspected. These components
could have been damaged due to excessive vibra-
tion.
(1) If pump is being replaced, install the heater
hose fitting to the pump. Use a sealant on the fitting
such as MopartThread Sealant With Teflon. Refer to
the directions on the package.
(2) Clean the gasket mating surfaces. If the origi-
nal pump is used, remove any deposits or other for-
eign material. Inspect the cylinder block and water
pump mating surfaces for erosion or damage from
cavitation.
(3) Install the gasket and water pump. The sili-
cone bead on the gasket should be facing the water
pump. Also, the gasket is installed dry. Tighten
mounting bolts to 30 N´m (22 ft. lbs.) torque. Rotate
the shaft by hand to be sure it turns freely.
(4) Connect the radiator and heater hoses to the
water pump.
(5) Position water pump pulley to water pump
hub. Tighten bolts 28 N´m (250 in. lbs.).
Install the idler pulley. Tighten the bolt 47 N´m (35
ft. lbs.).
Fig. 47 Hose Clamp Tool - Typical
1 - HOSE CLAMP TOOL 6094
2 - HOSE CLAMP
Fig. 48 Clamp - Typical
1 - TYPICAL CONSTANT TENSION HOSE CLAMP
2 - CLAMP NUMBER/LETTER LOCATION
3 - TYPICAL HOSE
Fig. 49 Water Pump Remove/Install - Typical
1 - HEATER HOSE FITTING
2 - PUMP GASKET
3 - WATER PUMP
4 - LONG BOLT
5 - BOLTS (4) SHORT
7 - 52 ENGINEWJ
WATER PUMP - 4.0L (Continued)

INSPECTION
Visually inspect the pressure valve gasket on the
cap. Replace cap if the gasket is swollen, torn or
worn. Inspect the area around radiator filler neck for
white deposits that indicate a leaking cap.
WATER PUMP INLET TUBE
REMOVAL
WARNING: CONSTANT TENSION HOSE CLAMPS
ARE USED ON MOST COOLING SYSTEM HOSES.
WHEN REMOVING OR INSTALLING, USE ONLY
TOOLS DESIGNED FOR SERVICING THIS TYPE OF
CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER
6094) (Fig. 52). SNAP-ON CLAMP TOOL (NUMBER
HPC-20) MAY BE USED FOR LARGER CLAMPS.
ALWAYS WEAR SAFETY GLASSES WHEN SERVIC-
ING CONSTANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps (Fig. 53). If
replacement is necessary, use only an original
equipment clamp with matching number or letter.
(1) Partially drain cooling system .
(2) Do not waste reusable coolant. If solution is
clean, drain coolant into a clean container for reuse.(3) Loosen both bypass hose clamps (Fig. 52) and
position to center of hose. Remove hose from vehicle.
INSTALLATION
(1) Position bypass hose clamps (Fig. 52) to center
of hose.
(2) Install bypass hose to engine.
(3) Secure both hose clamps (Fig. 52).
(4) Refill cooling system .
(5) Start and warm the engine. Check for leaks.
Fig. 51 Pressure Testing Radiator Pressure
CapÐTypical
1 - PRESSURE CAP
2 - TYPICAL COOLING SYSTEM PRESSURE TESTER
Fig. 52 Hose Clamp ToolÐTypical
1 - HOSE CLAMP TOOL 6094
2 - HOSE CLAMP
Fig. 53 Clamp Number/Letter Location
1 - TYPICAL CONSTANT TENSION HOSE CLAMP
2 - CLAMP NUMBER/LETTER LOCATION
3 - TYPICAL HOSE
7 - 54 ENGINEWJ
RADIATOR PRESSURE CAP (Continued)

CHIME/BUZZER
TABLE OF CONTENTS
page page
CHIME WARNING SYSTEM
DESCRIPTION..........................1
OPERATION............................1DIAGNOSIS AND TESTING - CHIME
WARNING SYSTEM.....................3
CHIME WARNING SYSTEM
DESCRIPTION
The chime warning system uses a single chime
tone generator that is integral to the Body Control
Module (BCM) to provide an audible indication of
vehicle conditions that may require the attention of
the vehicle operator (Fig. 1). The chime warning sys-
tem includes the following major components:
²Body Control Module
²Door Ajar Switch
²Headlamp Switch
²Ignition Switch
²Seat Belt SwitchHard wired circuitry connects many of the chime
warning system components to each other through
the electrical system of the vehicle.
If the BCM or the chime tone generator are dam-
aged or faulty, the BCM unit must be replaced.
OPERATION
The chime warning system components operate on
battery voltage received through the Ignition-Off
Draw (IOD) fuse in the Power Distribution Center
(PDC) on a non-switched B(+) circuit so that the sys-
tem may operate regardless of the ignition switch
position.
Fig. 1 Chime Warning System
1 - IGNITION SWITCH
2 - SEAT BELT SWITCH
3 - DOOR AJAR SWITCH4 - HEADLAMP SWITCH
5 - BODY CONTROL MODULE
WJCHIME/BUZZER 8B - 1

The chime warning system provides an audible
indication to the vehicle operator under the following
conditions:
²Fasten Seat Belt Warning- The Body Control
Module (BCM) chime tone generator will generate
repetitive chimes to announce that an input from the
seat belt switch indicates the driver side front seat
belt is not fastened. Unless the driver side front seat
belt is fastened, the chimes will continue to sound for
a duration of about six seconds each time the ignition
switch is turned to the On position or until the driver
side front seat belt is fastened.
²Head/Park Lights-On Warning- The BCM
chime tone generator will generate repetitive chimes
at a fast rate to announce that a Programmable
Communications Interface (PCI) data bus driver door
ajar message, along with hard wired inputs from the
headlamp switch indicate that the exterior lamps are
turned On with the driver side front door opened.
The chime will continue to sound until the exterior
lamps are turned Off, the driver side front door is
closed, or the ignition switch is turned to the On
position.
²Key-In-Ignition Warning- The BCM chime
tone generator will generate repetitive chimes at a
fast rate to announce that a PCI data bus driver door
ajar message received from the Driver Door Module
(DDM), along with hard wired inputs from the key-
in-ignition warning switch indicate that the key is in
the ignition cylinder with the driver side front door
opened and the ignition switch in the Off position.
The chime will continue to sound until the key is
removed from the ignition lock cylinder, the driver
side front door is closed, or the ignition switch is
turned to the On position.
²Overspeed Warning- The BCM chime tone
generator will generate repetitive chimes at a slowrate to announce that a PCI data bus vehicle speed
message received from the Powertrain Control Mod-
ule (PCM) indicates that the vehicle speed is above
120 kilometers-per-hour (75 miles-per-hour). The
chimes will continue to sound until the vehicle speed
is below 120 kilometers-per-hour (75 miles-per-hour).
This feature is only enabled on a BCM that has been
programmed with a Middle East Gulf Coast Country
(GCC) country code.
²Tactile Beep Support- The BCM chime tone
generator will generate a single beep each time a
PCI data bus tactile beep request message is received
from the Electronic Vehicle Information Center
(EVIC) or the Sentry Key Immobilizer Module
(SKIM). This beep provides an audible confirmation
that an EVIC button was completely depressed, or
that the optional Sentry Key Immobilizer System
(SKIS) is in the ªCustomer Learnº mode.
²Warning Beep Support- The BCM chime tone
generator will generate a short series of beeps each
time a PCI data bus warning beep request message
is received from the EVIC or the Electro-Mechanical
Instrument Cluster (EMIC). These beeps provide an
audible alert to the vehicle operator, of certain visual
warning indications displayed by the EVIC and/or
the EMIC.
The BCM provides chime service for all available
features in the chime warning system. The BCM
relies upon message inputs received from other mod-
ules over the PCI data bus network to provide chime
service for all of the remaining chime warning sys-
tem features.
The internal programming of the BCM determines
the priority of each chime tone request input that is
received, as well as the rate and duration of each
chime tone that is to be generated.
8B - 2 CHIME/BUZZERWJ
CHIME WARNING SYSTEM (Continued)

CHIME WARNING SYSTEM DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
NO KEY-IN IGNITION OR
HEADLAMPS-ON WARNING
CHIME WITH DRIVER SIDE
FRONT DOOR OPEN1. Faulty door ajar switch or
circuits.1. Check that interior lights illuminate with driver
door open. If not OK, repair the interior lighting
system as required.
2. Faulty headlamp switch
(left multi-function switch) or
circuits.2. Check for proper exterior lighting operation. If
not OK, repair the exterior lighting system as
required.
3. Key-in ignition switch
sense circuit open.2. Check for continuity between the key-in ignition
switch sense circuit of the instrument panel wire
harness connector for the ignition switch and the
body wire harness connector for the junction
block. Repair the key-in ignition switch sense
circuit, if required.
4. Faulty ignition switch. 3. Check for continuity between the two terminals
in the ignition switch connector. There should be
continuity with a key in the ignition lock cylinder.
Replace the faulty ignition switch, if required.
CHIME SOUNDS WITH
DRIVER SIDE FRONT
DOOR OPEN1. Key-in ignition switch
sense circuit shorted.1. Disconnect the instrument panel wire harness
connector for the ignition switch and the body
wire harness connector for the junction block.
There should be no continuity between the key-in
ignition switch sense circuit of the instrument
panel wire harness connector for the ignition
switch and a good ground. Repair the key-in
ignition switch sense circuit, if required.
2. Faulty ignition switch. 2. Check for continuity between the two terminals
in the ignition switch connector. There should be
no continuity with the key removed from the
ignition lock cylinder. Replace the faulty ignition
switch, if required.
NO CHIMES AT ALL TIMES 1. Faulty Body Control
Module (BCM).1. Use a DRBIIITscan tool and refer to the
appropriate diagnostic information. Replace the
faulty BCM, if required
8B - 4 CHIME/BUZZERWJ
CHIME WARNING SYSTEM (Continued)

BCM programming then performs those tasks and
provides features through both PCI data bus commu-
nication with other electronic modules and hard
wired outputs to a number of relays. These relays
provide the BCM with the ability to control numer-
ous high current accessory systems in the vehicle.
The BCM circuitry operates on battery current
received through fuses in the Junction Block (JB) on a
non-switched fused B(+) circuit, a fused ignition switch
output (start-run) circuit, and a fused ignition switch
output (run-accessory) circuit. This arrangement allows
the BCM to provide some features regardless of the
ignition switch position. The BCM circuitry is grounded
through the chassis beneath the center console.
The BCM monitors its own internal circuitry as
well as many of its input and output circuits, and
will store a Diagnostic Trouble Code (DTC) in elec-
tronic memory for any failure it detects. These DTCs
can be retrieved and diagnosed using a DRBIIItscan
tool. Refer to the appropriate diagnostic information.
HARD WIRED INPUTS
The hard wired inputs to the BCM include the fol-
lowing:
²A/C switch signal
²Ambient temperature sensor signal
²Body control module flash enable
²Coolant level switch sense
²Door ajar switch sense (two circuits - one left
rear, and one right rear)
²Driver seat heater switch mux
²Fog lamp switch sense
²Fused B(+)
²Fused ignition switch output (run-acc)
²Fused ignition switch output (st-run)
²Ground (five circuits - two Z1, and three Z2)
²Hazard switch sense
²Headlamp switch mux
²High beam switch sense
²Hood ajar switch sense (export)
²Key-in ignition switch sense
²Liftgate ajar switch sense
²Liftgate courtesy disable
²Liftgate flip-up ajar switch sense
²Panel lamps dimmer signal
²Park lamp relay output
²Passenger seat heater switch mux
²PCI bus
²Radio control mux
²Rear window defogger switch sense
²Seat belt switch sense
²Ultralight sensor signal
²Washer fluid switch sense
²Washer pump switch sense
²Windshield wiper switch mux
²Wiper park switch sense
MESSAGING
The BCM uses the following messages received
from other electronic modules over the PCI data bus:
²Accessory Delay Control (DDM/PDM)
²Battery Temperature (PCM)
²Chime Request (EMIC, EVIC, SKIM)
²Cylinder Lock Switch Status (DDM)
²Door Ajar Status/Front Doors (DDM/PDM)
²Door Lock Status (DDM/PDM)
²Engine Model (PCM)
²Engine RPM (PCM)
²Engine Temperature (PCM)
²English/Metric Default (EMIC)
²Fuel Tank Level (PCM)
²Fuel Used/Injector Pulses (PCM)
²Panic Control (PDM)
²Programmable Features Preferences/Audible &
Optical Chirps/Headlamp Delay (EVIC)
²RKE Status (PDM)
²Vehicle Identification Number (PCM)
²Vehicle Speed (PCM)
The BCM provides the following messages to other
electronic modules over the PCI data bus:
²A/C Switch Status (PCM)
²Ambient Temperature Data (AZC/EVIC/PCM)
²Average/Instantaneous Fuel Economy (EVIC)
²Country Code (EMIC)
²Courtesy Lamp Status (DDM/PDM)
²Distance To Empty (EVIC)
²Elapsed Ignition On Timer (EVIC)
²English/Metric Status (EMIC)
²Front & Rear Door Ajar Status (EVIC)
²Front & Rear Fog Lamp Status (EMIC)
²Heated Seat Switch Status (HSM/MHSM)
²High Beam Status (EMIC)
²Ignition Off Timer (EVIC)
²Ignition Switch Position (DDM/PDM)
²Key-In Ignition Status (DDM/PDM)
²Low Beam Status (EMIC)
²Panel Lamp Status (AZC/EMIC/Radio)
²Rear Window Defogger Relay Status (DDM/
PDM)
²Remote Radio Switch Status (Radio)
²Seatbelt Status (EMIC/MHSM/MSM)
DIAGNOSIS AND TESTING - BODY CONTROL
MODULE
The hard wired inputs to and outputs from the
Body Control Module (BCM) may be diagnosed and
tested using conventional diagnostic tools and proce-
dures. Refer to the appropriate wiring information.
Conventional diagnostic methods may not prove
conclusive in the diagnosis of the BCM. In order to
obtain conclusive testing of the BCM, the Program-
mable Communications Interface (PCI) data bus net-
work and all of the electronic modules that provide
8E - 4 ELECTRONIC CONTROL MODULESWJ
BODY CONTROL MODULE (Continued)