Chrysler Pacifica. Manual — part 516
CONDITION
POSSIBLE CAUSES
CORRECTION
Vehicle doors locked
Unlock doors
Low battery voltage
Check battery system voltage
Blown fuse
Check fuse and replace if required
Failure of latch assembly
Check ratchet and pawl switch status with
DRB III
Check for foreign matter or damaged
components preventing the operation of
latch assembly
Troubleshoot using body diagnostic
information. Replace latch assembly, if
necessary
Failure of outside handle switch
Check for diagnostic trouble codes and
cycle with DRB III
Failure of Power Liftgate or Body
Control Module
Check for diagnostic trouble codes and
cycle with DRB III
Wiring problems (system or vehicle)
Troubleshoot using electrical schematics.
Refer to wiring diagrams
Binding or sticking of components
Establish location of binding and replace
necessary components
Liftgate does not stay open
Failure of liftgate prop rods
Replace prop rods
Excessive cold or weight on liftgate
Check for added weight or extreme cold
climate
High opening effort
Failure of liftgate prop rods
Replace prop rods
Check for broken attachments
Drive unit jamed or did not
disengage
Troubleshoot using Body Diagnostic
Information Replace components, if
necessary
Binding or sticking of components
Establish location of binding and replace
necessary components
Liftgate continues to cinch
closed during power mode
Failure of Power Liftgate Module
Check for diagnostic trouble codes and
cycle with DRB III, see Body Diagnostic
Information for detailed procedures
Wiring problems (system or vehicle)
Troubleshoot using electrical schematics.
Refer to wiring diagrams
Liftgate continues to open
during power mode
(runaway motor)
Failure of Power Liftgate Module
Check for diagnostic trouble codes and
cycle with DRB III, see Body Diagnostic
Information for detailed procedures
Failure of full open switch
Check switch status with DRB III
Replace switch, if necessary
Failure of motor assembly
Check for continuous drive condition
Wiring problems (system or vehicle)
Troubleshoot using electrical schematics.
Refer to Wiring Diagrams
Liftgate opens very slowly
Low battery voltage
Check battery electrical system voltage
Failure of liftgate prop rods
Replace prop rods, if necessary
CS
POWER LIFTGATE SYSTEM
8N - 5
POWER LIFTGATE SYSTEM (Continued)
CONDITION
POSSIBLE CAUSES
CORRECTION
Binding or sticking of components
Establish location of binding and replace
necessary components
Wiring problems (system or vehicle)
Troubleshoot using electrical schematics.
Refer to Wiring Diagrams
Grade of vehicle too steep for power
operation
Operate liftgate manually
Failure of liftgate motor assembly
Replace motor assembly, if necessary
Squeaks, Noises and rattles
Foreign material in door
compartment
Remove foreign material
Worn/Loose components
Check and tighten/replace loose
components
Power liftgate drive unit
overtravel in closed
direction
Liftgate linkrod not attached to drive
unit and liftgate
Check for damage and replace
components if necessary / connect linkrod
STANDARD PROCEDURE
STANDARD PROCEDURE - LIFTGATE
ADJUSTMENT
In order for the power liftgate system to function
properly the liftgate must move freely and smoothly.
The power liftgate system can accommodate for some
minor changes in the effort required to move the lift-
gate. However, in extreme conditions the liftgate may
need to be mechanically adjusted for proper fit and
finish. Refer to the Liftgate Adjustment procedure in
the Body section of the service manual for detailed
instructions.
If a problem exists with the power liftgate and it is
suspected to be extreme effort, check the liftgate prop
rods and hinges for free movement. Use a known
good vehicle for liftgate effort comparison.
STANDARD PROCEDURE - POWER LIFTGATE
LEARN CYCLE
Any time a power liftgate component is removed,
replaced or a liftgate adjustment is performed, a
learn cycle must be performed. This learn cycle
enables the power liftgate control module to learn or
relearn information (travel limits, resistance to door
travel, etc.) which allows it to perform properly and
safely. To perform a learn cycle do the following:
(1) Obtain a DRB III
t scan tool.
(2) Connect the DRB III
t to the vehicle and check
for any power liftgate system stored trouble codes,
correct and erase any stored codes.
(3) Close liftgate.
(4) Using the DRB III
t, Reset module, Go into
Test Routine Menu and select the power open com-
mand.
(5) Select the power close command.
(6) The liftgate learn cycle is complete.
If a DRB III
t scan tool is not available the learn
cycle can be performed by actuating the liftgate by
using any of the normal command switches. Be cer-
tain to cycle the liftgate through several complete
open and close cycle before returning the vehicle to
service.
NOTE: If the power liftgate will not complete a full
cycle a problem exists with the power liftgate sys-
tem.
STANDARD PROCEDURE - LIFTGATE SERVICE
RELEASE
The CS utilizes an electronic liftgate release sys-
tem. In the unlikely event that the vehicle losses
power or the electric release system fails the follow-
ing procedure can be used to open the rear liftgate.
(1) Obtain a large flat-bladed screwdriver, enter
the vehicle and approach the liftgate.
(2) On the lower portion of the liftgate trim panel
you will find a 25mm plastic plug. Remove the plug
from the trim panel by gently prying out.
(3) Insert the screwdriver through the access hole
and find the slot in the beige release lever. Rotate
the release lever up and to the right (when facing
rearward), Hold the release lever until the latch has
cleared the striker.
8N - 6
POWER LIFTGATE SYSTEM
CS
POWER LIFTGATE SYSTEM (Continued)
SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE
COMPONENT TORQUE SPECIFICATIONS
DESCRIPTION
N·m
In. Lbs.
Drive Unit to D-pillar
28
250 ±50
Motor to Clutch
5.5
50
Pinch Sensor
N/A
25
Link Rod Bracket to Liftgate
28
250 ±50
Liftgate Latch
10
90
CHIME/THERMISTOR
DESCRIPTION
Vehicles equipped with a power liftgate utilize a
chime/thermistor
assembly.
The
chime/thermistor
assembly is a small cylindrical shaped electrical com-
ponent mounted in the rear license plate lamp hous-
ing assembly. The chime portion of the component
produces the audible chime sound heard at the rear
of the vehicle at the start of a power cycle. The ther-
mistor is a temperature sensor used by the power
liftgate control module to enable proper liftgate oper-
ation in extreme climate conditions.
The
chime/thermistor
cannot
be
adjusted
or
repaired and if damaged it must be replaced. Consult
your Mopar™ parts catalog for a specific part num-
ber.
OPERATION
The chime function is activated by a hardwired
connection to the power liftgate module. The ther-
mistor provides a outside temperature signal to the
power liftgate control module. As the outside temper-
ature increases the resistance reading decreases, as
temperature
decreases
the
resistance
reading
increases.
REMOVAL
(1) Open the liftgate.
(2) Disconnect and isolate the negative battery
cable.
(3) Remove the rear light bar assembly from the
vehicle. Refer to the Body section for the procedure.
(4) Using your hands, grasp the light bar at its
sides next to chime/thermistor assembly and gently
pull the two sides of the light bar apart until the
chime/thermistor can be removed.
CAUTION: Locate the wires coming from the chime/
thermistor. On a piece of paper, note the wire color
and cavity the wires are currently installed in on
both the component and connector side of the har-
ness. This will prove helpful later.
(5) Locate the wires going to the chime/thermistor.
Cut the tie strap and trace the wires to the electrical
connector and back the wires out of the connector.
Refer to the Wiring section of the service information
for detailed instructions.
INSTALLATION
(1) Snap the chime/thermistor assembly into the
light bar.
(2) Locate the wires going to the chime/thermistor.
Install the wires in the connector. Secure with a tie
strap. Refer to the Wiring section for detailed
instructions.
NOTE: Be certain the wires are reinstalled in the
correct wire cavities. Failure to do so could result
in damage to the chime/thermistor assembly. Refer
to Wiring Diagrams if uncertain.
(3) Install the rear light bar assembly on the vehi-
cle. Refer to the Body section for the procedure.
(4) Connect the negative battery cable.
CS
POWER LIFTGATE SYSTEM
8N - 7
POWER LIFTGATE SYSTEM (Continued)
DRIVE UNIT
DESCRIPTION
Vehicles equipped with a power liftgate, utilize a
power liftgate drive unit. The drive unit assembly
(Fig. 1) consists of a DC motor, optical sensor, clutch,
full-open switch, rack, housing/bracket assembly and
wire harness. The clutch and motor portion (Fig. 2) of
the assembly provides the power and torque required
to open or close the liftgate under the worst case con-
ditions. The optical sensor is used to provide the lift-
gate control module with a clutch/motor speed signal.
This speed signal is used to monitor any resistance of
liftgate travel and allows the liftgate control module
to detect obstructions and control the liftgate accord-
ingly. The clutch assembly is used to allow automatic
power open/close mode and/or full manual operation,
if desired. The full-open switch is used to let the lift-
gate control module know when the liftgate is
approaching the full open position.
Replaceable components of the power liftgate drive
unit assembly are the complete unit, motor alone,
optical sensor, full-open switch, link rod, channel/
brackets/clutch/rack and shoes/yoke assembly. Refer
to additional information in this group for more com-
ponent details.
The drive unit and components cannot be adjusted
or repaired and if damaged they must be replaced.
Consult your Mopar™ parts catalog for a specific
part number.
OPERATION
LIFTGATE IS CLOSED
Depressing either of the power liftgate open/close
command switches, sends a PCI data bus signal to
the power liftgate control module. The control module
will then signal the door mounted latch assembly to
release the door from its primary closed and latched
position to the ajar and movable position. The lift-
gate motor then takes over to move the liftgate into
the full open position.
LIFTGATE IS OPEN
Depressing either of the power liftgate open/close
command switches, sends a PCI data bus signal to
the power liftgate control module. The control module
will then signal the liftgate motor to move the lift-
gate into the closed position. Once the door mounted
latch reaches the body mounted striker assembly, the
power latch takes over to cinch the door to the fully
closed and latched position.
If a obstacle is encountered during a power open or
close cycle, the power liftgate control module will
automatically reverse direction of the liftgate to pre-
vent vehicle damage or personal injury. Refer to the
owners manual for additional information.
Fig. 1 Power Liftgate Drive Unit
Fig. 2 CS Drive Unit Components
1 - Motor Assembly
2 - Clutch Housing
3 - Full Open Switch
4 - Optical Sensor
5 - Channel/Bracket Assembly
8N - 8
POWER LIFTGATE SYSTEM
CS
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