ECU CHRYSLER CARAVAN 2003 Repair Manual
[x] Cancel search | Manufacturer: CHRYSLER, Model Year: 2003, Model line: CARAVAN, Model: CHRYSLER CARAVAN 2003Pages: 2177, PDF Size: 59.81 MB
Page 405 of 2177
REMOVAL
When replacing the spark plugs and spark plug
cables, route the cables correctly and secure them in
the appropriate retainers. Failure to route the cables
properly can cause the radio to reproduce ignition
noise, cross ignition of the spark plugs orshort cir-
cuit the cables to ground.
Always remove cables by grasping at the boot,
rotating the boot 1/2 turn, and pulling straight back
in a steady motion.
(1) Prior to removing the spark plug, spray com-
pressed air around the spark plug hole and the area
around the spark plug.
(2) Remove the spark plug using a quality socket
with a foam insert.
(3) Inspect the spark plug condition.
INSTALLATION
When replacing the spark plugs and spark plug
cables, route the cables correctly and secure them in
the appropriate retainers. Failure to route the cables
properly can cause the radio to reproduce ignition
noise, cross ignition of the spark plugs orshort cir-
cuit the cables to ground.
(1) Coat threads of spark plug with anti-seize. Be
sure not to get anti-seizeANTWHERE BUT ON
THE THREADS OF THE SPARK PLUG as
shown in (Fig. 13).
(2) To avoid cross threading, start the spark plug
into the cylinder head by hand.
(3) Tighten spark plugs to 17.5 N´m (13 ft. lbs.)
torque.
(4) Install spark plug cables over spark plugs. A
click will be heard and felt when the cable properly
attaches to the spark plug.
SPARK PLUG CABLE
DESCRIPTION
Spark Plug cables are sometimes referred to as
secondary ignition wires. The wires transfer electri-
cal current from the ignition coil pack to individual
spark plugs at each cylinder. The resistive spark plug
cables are of nonmetallic construction. The cables
provide suppression of radio frequency emissions
from the ignition system.
Check the spark plug cable connections for good
contact at the coil, and spark plugs. Terminals should
be fully seated. The insulators should be in good con-
dition and should fit tightly on the coil, and spark
plugs. Spark plug cables with insulators that are
cracked or torn must be replaced.
Clean Spark Plug cables with a cloth moistened
with a non-flammable solvent. Wipe the cables dry.
Check for brittle or cracked insulation. The spark
plug cables and spark plug boots are made from high
temperature materials.
REMOVAL - 2.0/2.4L
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
Remove spark plug cable from coil first.
Always remove the spark plug cable by grasping
the top of the spark plug insulator, turning the boot
1/2 turn and pulling straight up in a steady motion.
INSTALLATION - 2.0/2.4L
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
Install spark plug insulators over spark plugs.
Ensure the top of the spark plug insulator covers the
upper end of the spark plug tube, then connect the
other end to coil pack.
8I - 10 IGNITION CONTROLRS
SPARK PLUG (Continued)
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SPEEDOMETER DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
NO POINTER
MOVEMENT.1. INTERNAL CLUSTER
FAILURE.1.A. PERFORM CLUSTER SELF-DIAGNOSTIC TEST AND
CHECK FOR FAULT CODES.
²IF SPEEDOMETER POINTER MOVES TO CALIBRATION
POINTS DURING TEST LOOK FOR ANOTHER POSSIBLE
CAUSE OF FAILURE.
²IF THE POINTER DOESN'T MOVE DURING TEST,
CHECK FOR POWER AND GROUND TO THE MIC. IF
POWER AND GROUND ARE PRESENT GO TO STEP 1.B.
1.B. REPLACE CLUSTER. GO TO STEP 1.C.
1.C. CONNECT CLUSTER INTO INSTRUMENT PANEL
WIRING HARNESS. PLACE IT BACK INTO THE PROPER
POSITION IN THE INSTRUMENT PANEL. PUT IN THE
TOP FOUR MOUNTING SCREWS AND SECURE THE
CLUSTER TO THE INSTRUMENT PANEL.
2. NO SPEED PCI BUS
MESSAGE OR ZERO
MPH PCI SPEED BUS
MESSAGE.2.A. CHECK THE PCM (CODE 10) USING A DRB IIIT
SCAN TOOL. IF OK, GO TO STEP 2.B. IF NOT OK,
REFER TO THE PROPER POWERTRAIN DIAGNOSTIC
PROCEDURES MANUAL TO REPAIR THE PCM.
2.B. CHECK THE SPEED SIGNAL INPUT INTO THE PCM.
THE SPEED SIGNAL ORIGINATES FROM THE TCM FOR
VEHICLES WITH THE 4 SPEED ELECTRONIC
TRANSMISSIONS. CHECK CONTINUITY FROM TCM TO
PCM. IF OK, USE A DRB IIITSCAN TOOL TO CHECK
TCM. REFER TO THE PROPER TRANSMISSION
DIAGNOSTIC PROCEDURES MANUAL TO REPAIR THE
TCM. IF NOT OK, REPAIR WIRING.
8J - 4 INSTRUMENT CLUSTERRS
INSTRUMENT CLUSTER (Continued)
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MULTI-FUNCTION SWITCH
DESCRIPTION - TURN SIGNAL SYSTEM.....21
OPERATION - TURN SIGNAL SYSTEM.......21
DIAGNOSIS AND TESTING - MULTI-
FUNCTION SWITCH...................21
REMOVAL.............................21
INSTALLATION.........................21
PARK/TURN SIGNAL LAMP
REMOVAL.............................21
INSTALLATION.........................21
PARK/TURN SIGNAL LAMP - EXPORT
REMOVAL.............................22
INSTALLATION.........................22
REAR FOG LAMP - EXPORT
DESCRIPTION.........................22REPEATER LAMP - EXPORT
REMOVAL.............................22
INSTALLATION.........................22
TAIL LAMP
REMOVAL.............................22
INSTALLATION.........................22
TAIL LAMP - EXPORT
REMOVAL.............................23
INSTALLATION.........................23
TAIL LAMP UNIT
REMOVAL.............................23
INSTALLATION.........................23
LAMPS/LIGHTING - EXTERIOR
DESCRIPTION
LAMP SYSTEMS
Lighting circuits are protected by fuses. Lighting
circuits require an overload protected power and high
side drivers source, ON/OFF device, lamps and body
grounds to operate properly. Plastic lamps require a
wire in the harness to supply body ground to the
lamp socket. Replace sockets and bulbs that are cor-
roded.
Some of the interior and exterior lighting functions
are governed by the Body Control Module (BCM).
The headlamp, dome, and the door ajar switches pro-
vide signals to the BCM. The BCM in turn sends a
Programmable Communication Interface (PCI) bus
message to the Front Control Module (FCM) to
enable the necessary drivers to set the required illu-
mination configuration.
Wire connectors can make intermittent contact or
become corroded. Before coupling wire connectors,
inspect the terminals inside the connector. Male ter-
minals should not be bent or disengaged from the
insulator. Female terminals should not be sprung
open or disengaged from the insulator. Bent and
sprung terminals can be repaired using needle nose
pliers and pick tool. Corroded terminals appear
chalky or green. Corroded terminals should be
replaced to avoid recurrence of the problem symp-
toms.
Begin electrical system failure diagnosis by testing
related fuses in the fuse block and intelligent power
module. Verify that bulbs are in good condition and
test continuity of the circuit ground. Refer to the
appropriate wiring information.
AUTOMATIC HEADLAMP SYSTEM
The Automatic Headlamp system turns the instru-
mentation and exterior illumination lamps ON when
the ambient light levels are Night and the engine
RPM is 450 or above, and OFF when light levels are
Day.
DAYTIME RUNNING LAMPS
Operating the high-beam headlamps at reduced
power provides daytime running lamps, which are
required on all new Canadian vehicles.
HEADLAMPS ON WITH WINDSHIELD WIPERS
For vehicles equipped with the Automatic Head-
lamp System, the instrumentation and exterior illu-
mination lamps will be turned ON when the
headlamp switch is in the AUTO position, RPM >
450 and the windshield wipers have been in the
intermittent, low or high mode of operation for more
than ten seconds. When the windshield wipers are
turned OFF the Body Control Module will determine
if the instrumentation and exterior illumination
lamps should remain ON base upon the current
ambient light level.
HEADLAMP SYSTEM
The configuration of the headlamp system of head-
lamps, park lamps and fog lamps is determined by
the BCM. The BCM determines the lighting configu-
ration as a result of the inputs from the ignition
switch, headlamp switch and multi-function switch. A
PCI bus is transmitted from the BCM to the FCM to
enable the necessary drivers to set the illumination
configuration. Four wires are connected between the
headlamp switch and the BCM. The first wire con-
tains information regarding the position of the head-
lamp switch (Off, Automatic Headlamps, Automatic
Headlamp switch fog, Park with Fog, Head, or Head
with Fog Lamps). The second wire contains informa-
tion regarding the position of the dimmer switch
8L - 2 LAMPS/LIGHTING - EXTERIORRS
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FRONT FOG LAMP DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
FOG LAMPS ARE DIM
WITH ENGINE IDLING
OR IGNITION TURNED
OFF.1. Loose or corroded battery
cables.1. Clean and secure battery cable clamps and
posts.
2. Loose or worn generator drive
belt.2. Adjust or replace generator drive belt.
3. Charging system output too low. 3. Test and repair charging system. Refer to
Electrical, Charging,
4. Battery has insufficient charge. 4. Test battery state-of-charge. Refer to
Electrical, Battery System.
5. Battery is sulfated or shorted. 5. Load test battery. Refer to Electrical, Battery
System.
6. Poor lighting circuit Z349/Z248
ground.6. Test for voltage drop across Z349/248
ground locations. Refer to Electrical, Wiring
Information.
FOG LAMP BULBS
BURN OUT
FREQUENTLY1. Charging system output too
high.1. Test and repair charging system. Refer to
Electrical, Charging.
2. Loose or corroded terminals or
splices in circuit.2. Inspect and repair all connectors and splices.
Refer to Electrical, Wiring Information.
FOG LAMPS ARE DIM
WITH ENGINE
RUNNING ABOVE IDLE1. Charging system output too low. 1. Test and repair charging system. Refer to
Electrical, Charging.
2. Poor lighting circuit Z349/Z248
ground.2. Test for voltage drop across Z349/Z248
ground locations. Refer to Electrical, Wiring
Information.
3. High resistance in fog lamp
circuit.3. Test amperage draw of fog lamp circuit.
FOG LAMPS FLASH
RANDOMLY1. Poor lighting circuit Z349/Z248
ground.1. Test for voltage drop across Z349/Z248
ground locations. Refer to Electrical, Wiring
Information.
2. Variable resistance in fog lamp
circuit.2. Test amperage draw of fog lamp circuit.
3. Faulty fog lamp switch (part of
headlamp switch).3. Replace headlamp switch.
4. Loose or corroded terminals or
splices in circuit.4. Inspect and repair all connectors and splices.
Refer to Electrical, Wiring Information.
5. Is relay engaging properly? 5. Verify function of fog lamp relay in IPM.
6. PCI Bus Communication. 6. Verify PCI bus message (fog lamp info)
transmitted from BCM and received by FCM.
FOG LAMPS DO NOT
ILLUMINATE1. Blown fuse for fog lamp. 1. Replace fuse. Refer to Electrical, Wiring
Information.
2. No Z349/Z248 ground at fog
lamps.2. Repair circuit ground. Refer to Electrical,
Wiring Information.
3. Faulty fog lamp switch (part of
headlamp switch).3. Replace headlamp switch.
4. Broken connector terminal or
wire splice in fog lamp circuit.4. Repair connector terminal or wire splice.
5. Faulty or burned out bulb. 5. Replace bulb.
6. Is relay engaging? 6. Verify function of fog lamp relay in IPM.
7. PCI Bus Communication. 7. Verify PCI bus message (fog lamp info)
transmitted from BCM and received by FCM.
8L - 8 LAMPS/LIGHTING - EXTERIORRS
FRONT FOG LAMP (Continued)
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Before damaging a trim component, verify hidden
fasteners or captured edges are not holding the com-
ponent in place.
HEADLAMP DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
HEADLAMPS ARE DIM
WITH ENGINE IDLING
OR IGNITION TURNED
OFF.1. Loose or corroded battery
cables.1. Clean and secure battery cable clamps and
posts.
2. Loose or worn generator drive
belt.2. Adjust or replace generator drive belt.
3. Charging system output too low. 3. Test and repair charging system, refer to
Electrical, Charging
4. Battery has insufficient charge. 4. Test battery state-of-charge, refer to
Electrical, Battery System.
5. Battery is sulfated or shorted. 5. Load test battery, refer to Electrical, Battery
System.
6. Poor lighting circuit Z343/Z344-
ground.6. Test for voltage drop across Z343/Z344-
ground locations, refer to Electrical, Wiring
Diagram Information.
HEADLAMP BULBS
BURN OUT
FREQUENTLY.1. Integrated Power Module (IPM)
not controlling voltage.1. Test and repair Integrated Power Module.
2. Loose or corroded terminals or
splices in circuit.2. Inspect and repair all connectors and splices.
Refer to Electrical, Wiring Information.
HEADLAMPS ARE DIM
WITH ENGINE
RUNNING ABOVE IDLE.1. Charging system output too low. 1. Test and repair charging system, refer to
Electrical, Wiring Information.
2. Poor lighting circuit Z343/Z344-
ground.2. Test for voltage drop across Z343/Z344-
ground locations, refer to Electrical, Wiring
Information.
3. High resistance in headlamp
circuit.3. Test amperage draw of headlamp circuit.
HEADLAMPS FLASH
RANDOMLY1. Poor lighting circuit Z343/Z344-
ground.1. Test for voltage drop across Z343/Z344-
ground locations, refer to Electrical, Wiring
Information.
2. Variable resistance in headlamp
circuit.2. Test amperage draw of headlamp circuit.
3. Loose or corroded terminals or
splices in circuit.3. Inspect and repair all connectors and splices,
refer to Electrical, Wiring Information.
4. Faulty headlamp switch. 4. Replace headlamp switch.
8L - 12 LAMPS/LIGHTING - EXTERIORRS
HEADLAMP (Continued)
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Page 453 of 2177
DIAGNOSIS AND TESTING - COMPASS
MINI-TRIP COMPUTER
Compass Mini-Trip Computer (CMTC) and Com-
pass Temperature (CT) data is obtained from the
Body Control Module (BCM) on the J1850 Data Bus
circuit. The CMTC and CT will display dashes (- -)
for any of the screens it did not receive the bus mes-
sages. The label corresponding to the missing infor-
mation will be lit. If no compass mini-trip computer
data is displayed, check the J1850 Data Bus circuit
communications and the BCM. If the brightness level
is improper check the J1850 Data Bus circuit.
The DRB IIItis recommended for checking the
J1850 Data Bus circuit and the BCM. Perform the
CMTC, CT self diagnosis before replacing the CMTC
or CT module.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove overhead console(Refer to 8 - ELEC-
TRICAL/OVERHEAD CONSOLE - REMOVAL).
(3) Remove the screws holding Compass Mini-Trip
Computer module in the overhead console.
(4) Remove CMTC module from console assembly.
INSTALLATION
(1) Position the compass mini-trip computer mod-
ule in the overhead console.
(2) Install the ten screws holding the compass
mini-trip computer module in the overhead console.
(3) Install the overhead console (Refer to 8 -
ELECTRICAL/OVERHEAD CONSOLE - INSTALLA-
TION).
(4) Connect the battery negative cable.
NOTE: If a new EVIC module has been installed, the
compass will have to be calibrated and the variance
set. Refer to compass variation adjustment and
compass calibration in standard procedures.
UNIVERSAL TRANSMITTER
DESCRIPTION
On some RS models a Universal Transmitter trans-
ceiver is standard factory-installed equipment. The
universal transmitter transceiver is integral to the
Electronic Vehicle Information Center (EVIC) and the
Compass Mini-Trip Computer (CMTC) modules,
which is located in the overhead console. The only
visible component of the universal transmitter are
the three transmitter push buttons centered between
the modules push buttons located just rearward of
the display screen in the overhead console. The threeuniversal transmitter push buttons are identified
with one, two or three light indicators so that they be
easily identified by sight or by feel.
Each of the three universal transmitter push but-
tons controls an independent radio transmitter chan-
nel. Each of these three channels can be trained to
transmit a different radio frequency signal for the
remote operation of garage door openers, motorized
gate openers, home or office lighting, security sys-
tems or just about any other device that can be
equipped with a radio receiver in the 286 to 399
MegaHertz (MHz) frequency range for remote opera-
tion. The universal transmitter is capable of operat-
ing systems using either rolling code or non-rolling
code technology.
The electronics module displays messages and a
small house-shaped icon with one, two or three dots
corresponding to the three transmitter buttons to
indicate the status of the universal transmitter. The
EVIC messages are:
²Cleared Channels- Indicates that all of the
transmitter codes stored in the universal transmitter
have been successfully cleared.
²Training- Indicates that the universal trans-
mitter is in its transmitter learning mode.
²Trained- Indicates that the universal transmit-
ter has successfully acquired a new transmitter code.
²Transmit- Indicates that a trained universal
transmitter button has been depressed and that the
universal transmitter is transmitting.
The universal transmitter cannot be repaired, and
is available for service only as a unit with the EVIC
or CMTC modules. If any of these components is
faulty or damaged, the complete EVIC or CMTC
module must be replaced.
OPERATION
The universal transmitter operates on a non-
switched source of battery current so the unit will
remain functional, regardless of the ignition switch
position. For more information on the features, pro-
gramming procedures and operation of the universal
transmitter, see the owner's manual in the vehicle
glove box.
DIAGNOSIS AND TESTING - UNIVERSAL
TRANSMITTER
If the Universal Transmitter is inoperative, but the
Electronic Vehicle Information Center (EVIC) is oper-
ating normally, see the owner's manual in the vehicle
glove box for instructions on training the Transmit-
ter. Retrain the Transmitter with a known good
transmitter as instructed in the owner's manual and
test the Transmitter operation again. If the unit is
still inoperative, test the universal transmitter with
Radio Frequency Detector special tool. If both the
8M - 10 MESSAGE SYSTEMSRS
COMPASS/MINI-TRIP COMPUTER (Continued)
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Page 454 of 2177
Transmitter and the EVIC module are inoperative,
refer toElectronic Vehicle Information Center
Diagnosis and Testingin this group for further
diagnosis. For complete circuit diagrams, refer to
Wiring Diagrams. (Fig. 5) as described below:
(1) Turn the Radio Frequency (RF) Detector ON. A
ªchirpº will sound and the green power LED will
light. If the green LED does not light, replace the
battery.
(2) Hold the RF detector within one inch of the
TRAINED universal transmitter and press any of the
transmitters buttons.
(3) The red signal detection LEDs will light and
the tool will beep if a radio signal is detected. Repeat
this test three times.
STANDARD PROCEDURE
STANDARD PROCEDURE - SETTING
TRANSMITTER CODES
(1) Turn off the engine.
(2) Erase the codes by pressing the two outside
buttons. Release the buttons when the display con-
firms the operation (about 20 seconds).
(3) Choose one of the three buttons to train. Place
the hand-held transmitter within one inch of the uni-
versal transmitter and push the buttons on both
transmitters.(4) Release both buttons. Your universal transmit-
ter is now ªtrainedº. To train the other buttons,
repeat Step 3 and Step 4. Be sure to keep your hand-
held transmitter in case you need to retrain the uni-
versal transmitter.
STANDARD PROCEDURE - ERASING
TRANSMITTER CODES
To erase the universal transmitter codes, simply
hold down the two outside buttons until the display
confirms the operation.
NOTE: Individual channels cannot be erased. Eras-
ing the transmitter codes will erase ALL pro-
grammed codes.
REMOVAL
(1) For universal transmitter removal and installa-
tion procedure, (Refer to 8 - ELECTRICAL/OVER-
HEAD CONSOLE/COMPASS/MINI-TRIP
COMPUTER - REMOVAL and INSTALLATION).
AMBIENT TEMP SENSOR
DESCRIPTION
Ambient air temperature is monitored by the over-
head console through ambient temperature messages
received from the Front Control Module (FCM) over
the Programmable Communications Interface (PCI)
J1850 data bus circuit. The FCM receives a hard
wired input from the ambient temperature sensor.
The ambient temperature sensor is a variable resis-
tor mounted to a bracket that is secured with a screw
to the right side of the headlamp mounting module
grille opening, behind the radiator grille and in front
of the engine compartment.
For more information on the Front Control Module
refer to the Electronic Control Modules section of this
manual. For complete circuit diagrams, refer to the
appropriate wiring information. The ambient temper-
ature sensor cannot be adjusted or repaired and, if
faulty or damaged, it must be replaced.
OPERATION
The ambient temperature sensor is a variable
resistor that operates on a five-volt reference signal
sent to it by the Front Control Module. The resis-
tance in the sensor changes as temperature changes,
changing the temperature sensor signal circuit volt-
age to the Front Control Module. Based upon the
resistance in the sensor, the Front Control Module
senses a specific voltage on the temperature sensor
signal circuit, which it is programmed to correspond
to a specific temperature. The Front Control Module
Fig. 5 RADIO FREQUENCY DETECTOR
1 - SIGNAL DETECTION LED'S
2 - POWER LED
3 - ON/OFF SWITCH
4 - 9V BATTERY
RSMESSAGE SYSTEMS8M-11
UNIVERSAL TRANSMITTER (Continued)
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Page 467 of 2177
(3) Remove the rear lamp bar assembly from the
vehicle. Refer to the Body section of the service man-
ual for the procedure.
(4) Locate the two wires going to the exterior han-
dle switch. Cut the tie strap and trace the wires to
the large electrical connector and back the wires out
of the large connector and through the grommet.
Refer to the Wiring section of the service manual for
detailed instructions.
(5) Depress the two exterior handle switch retain-
ing tabs and roll the switch out of the light bar
assembly (Fig. 7).
INSTALLATION
(1) Install the handle switch in the light bar
assembly.
(2) Locate the two wires going to the exterior han-
dle switch. Install the wires through the grommet
and in the large connector. Secure with a tie strap.
Refer to the Wiring section of the service manual for
detailed instructions.
NOTE: Be certain wires are reinstalled in the correct
wire cavities. Failure to do so could result in dam-
age to the handle switch. Refer to Wiring Diagrams
if previous notes were not made.
(3) Install the rear light bar. Refer to the Body sec-
tion of the service manual for the procedure.
(4) Install the liftgate trim panel. Refer to the
Body section of the service manual for the procedure.
(5) Connect the negative battery cable.(6) Using an appropriate scan tool, check any
erase any power liftgate control module diagnostic
trouble codes.
(7) Verify power liftgate system and handle switch
operation. Cycle the power liftgate through one com-
plete open and close cycle, this will allow the power
liftgate control module to relearn its cycle with the
new components.
FULL OPEN SWITCH
DESCRIPTION
Vehicles equipped with a power liftgate utilize a
full open switch. This switch is located on the gear
motor housing (Fig. 8) and is used to signal the
power liftgate module when the liftgate is in the full
open position. Two wires are used from the full open
switch contacts to the gear motor assemblies main
electrical connector.
The full open switch is a serviceable component.
Consult your Mopar parts catalog for a specific part
number.
OPERATION
When the power liftgate reaches the full open posi-
tion, the gear motor housing mounted full open
switch electrical contacts come in contact with each
other. This sends a ground signal to the power lift-
Fig. 7 REAR LIGHT BAR
1 - CHIME / THERMISTOR
2 - ELECTRIC RELEASE HANDLE SWITCH
3 - LICENSE PLATE LAMPS
Fig. 8 FULL OPEN SWITCH LOCATION
1 - FULL OPEN SWITCH
2 - GEAR MOTOR ASSEMBLY RETAINING BOLT (1 OF 3)
8N - 12 POWER LIFTGATE SYSTEMRS
EXTERIOR HANDLE SWITCH (Continued)
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Page 469 of 2177
INSTALLATION
(1) Connect the liftgate lock cylinder link rod on
the cinch latch assembly. Rotate the plastic retaining
clip 90 É to lock retaining clip on linkrod.
(2) Connect the link rod on the lock cylinder.
(3) Install three new power latch retaining bolts.
Torque to 10 N´m (90 in. lbs.).
(4) Connect the power latch electrical connector
and secure push pin retainers.
(5) Connect the negative battery cable.
(6) Using an appropriate scan tool, check and
erase any power liftgate control module diagnostic
trouble codes related to the power latch.
(7) Verify power liftgate system and power cinch /
release latch operation. Cycle the power liftgate
through one complete open and close cycle, this will
allow the power liftgate control module to relearn its
cycle with the new components.
(8) Verify power liftgate manual operation. Using
liftgate key rotate the lock cylinder to verify door
operation. Pull door open using exterior liftgate han-
dle / switch.
(9) Install the liftgate trim panel. Refer to Body for
the procedure.
LATCH ACTUATOR
DESCRIPTION
Vehicles equipped with a power liftgate utilize a
power cinch latch or power release latch (Fig. 10).
The power cinch and/or power release is made possi-
ble by a latch actuator attached to the leading edge
of the power latch assembly. This 12 volt latch actua-
tor contains a small drive gear that meshes with the
latch assemblies internal gears to perform the power
cinch close / power release operations. Refer to the
Latch assembly for more information.
The power cinch/release actuator is serviceable
component. Consult your MoparŸ parts catalog for
specific part numbers.
OPERATION
During a power close cycle, the power cinch actua-
tor provides the torque required to close the power
liftgate from the secondary to the primary closed and
latched position. During a power open cycle, the
power release actuator releases the liftgate from the
primary closed and latched position to the fully
unlatched and movable position.
REMOVAL
(1) Disconnect and isolate the negative battery
cable.
(2) Open the liftgate and remove the lower liftgate
trim panel. Refer to Body for the procedure.
(3) Disconnect the power latch electrical connector
(Fig. 10).
(4) Remove the three latch retaining bolts.
(5) Grab the latch assembly and unhook the key
cylinder link rod from the key cylinder (Fig. 10).
(6) Place the latch assembly on a bench and locate
the three wires leading from the actuator portion of
the latch assembly.
(7) Disengage the main connector retaining push
pins from the latch actuator housing.
(8) Back the three wires out of the main latch elec-
trical connector. Refer to the wiring section of the
service manual for detailed instructions.
(9) Flip the latch assembly over and remove the
latch actuator retaining screw(s).
(10) Remove the latch actuator from the latch
assembly.
INSTALLATION
(1) Install the latch actuator on the latch assem-
bly.
(2) Install the three latch actuator retaining
screws. Torque the screws to 4 in. lbs.
(3) Install the three wires in the main latch elec-
trical connector. Refer to the wiring section of the
service manual for detailed instructions.
Fig. 10 POWER LATCH ORIENTATION
1 - LATCH & ACTUATOR ASSEMBLY
2 - LATCH ELECTRICAL CONNECTOR
3 - LOCK CYLINDER LINK ROD
4 - LIFTGATE LOCK CYLINDER
8N - 14 POWER LIFTGATE SYSTEMRS
LATCH (Continued)
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Page 470 of 2177
NOTE: Be certain wires are reinstalled in the correct
wire cavities. Failure to do so could result in dam-
age to the latch actuator. Refer to Wiring Diagrams
if previous notes were not made.
(4) Secure the main connector retaining push pins
on the latch actuator housing.
(5) Grab the latch assembly and hook the key cyl-
inder link rod on the key cylinder.
(6) Position the latch and install three new latch
retaining bolts. Torque to 10 N´m (90 in. lbs.).
(7) Connect the power latch electrical connector.
(8) Install the lower liftgate trim panel. Refer to
Body for the procedure.
(9) Connect the negative battery cable.
LIFTGATE MOTOR
DESCRIPTION
Vehicles equipped with a power liftgate, utilize a
liftgate gear/motor assembly (Fig. 11). The gear
motor assembly consists of a DC motor, hall effect
sensor, engage actuator, full open switch, lift gear,
aluminum housing, drive gears and wire harness.
The gears and motor portion of the assembly pro-
vides the power and torque required to open or close
the liftgate under the worst case conditions. The hall
effect sensor is used to provide the liftgate control
module with a speed reading, which is used to mon-itor the resistance of liftgate travel. This speed read-
ing also allows the power liftgate control module to
detect obstructions and move the liftgate accordingly.
The engage actuator is used to toggle between power
open/close mode and full manual mode when desired.
The full open switch is used to let the power liftgate
control module know when the liftgate is approach-
ing the full open position.
Serviceable components of the power liftgate gear/
motor assembly are the complete gear/motor assem-
bly, motor and wire harness, lift gear and control rod,
engage actuator, full open switch and the transverse
bracket. Refer to additional information in this group
for more component details.
OPERATION
With the push of a power liftgate command switch
(liftgate closed), the power liftgate control module
will signal the latch assembly to release the door
from its primary closed and latched position to the
released and movable position. The liftgate motor-
mounted engage actuator then engages the liftgate
motor assembly, which moves the liftgate into the
open position. The liftgate motor provides the torque
and power to move the door to its full open or closed
position(Refer to 8 - ELECTRICAL/POWER DOORS -
OPERATION) for additional information.
REMOVAL
The power liftgate gear/motor assembly is serviced
in two ways: the complete gear/motor assembly, or
the motor, aluminum housing, drive gears and wire
harness assembly. To perform this service, use the
following procedure to remove the gear/motor assem-
bly from the vehicle. Then refer to the other proce-
dures called out this section to transfer the
remaining components (engage actuator, full open
switch, transverse bracket and lift gear and rod) to
the replacement gear/motor assembly.
(1) Disconnect and isolate the negative battery
cable.
(2)
Remove the left rear D-pillar trim panel from the
vehicle. Refer to the Body section for the procedure.
(3) Disconnect the wire harness connector from the
motor assembly (Fig. 11).
(4) Remove the two bolts from the motor housing
and the one bolt from the transverse mount bracket.
(5) Grab the liftgate motor assembly and lift
upward and out to unhook the motor assembly from
the D-pillar.
(6) Remove the liftgate motor assembly from the
vehicle.
INSTALLATION
(1) Using the motor housing tab, hook the liftgate
motor assembly on the D-pillar.
Fig. 11 POWER LIFTGATE COMPONENTS
1 - POWER LIFTGATE GEAR MOTOR/ASSEMBLY
2 - POWER LIFTGATE CONTROL MODULE
3 - ELECTRICAL GROUND LOCATION
RSPOWER LIFTGATE SYSTEM8N-15
LATCH ACTUATOR (Continued)
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