Chrysler RG Voyager. Manual — part 732

gate control module, located on the vehicles left body
D-pillar behind the trim panel. The power liftgate
gear motor assembly is located just above the control
module. The latch assembly is located in the bottom
center of the power liftgate, below the exterior lift-
gate handle switch. The power liftgate full open
switch, engage actuator, lift gear and rod are part of
the liftgate gear motor assembly. The pawl and
ratchet switches are part of the latch assembly. The
pinch sensors are located along the right and left
sides of the power liftgate, just above the body line.

The liftgate handle switch is a power release switch
and is located in the rear light bar assembly, just
above the license plate. The overhead console switch
is a power open and close command switch located in
the vehicles overhead console.

Software technology has enabled the power liftgate

control module to detect resistance to liftgate travel,
which allows the power liftgate to stop and reverse
direction anytime an obstruction is felt or any of the
command switches are operated (only in closing
direction). Battery voltage is supplied to the power
liftgate system through a 40 amp fuse, located in the
Integrated Power Module (IPM) assembly. If the
power liftgate system develops a fault, the power lift-
gate can still be operated manually with a key, sim-
ilar to a manual liftgate.

The power liftgate control module communicates

on the Programmable Communication Interface (PCI)
Bus Circuit. Therefore, the power liftgate control
module can generate and store its own Diagnostic
Trouble Codes (DTC). The vehicles Body Control
Module (BCM) receives and supplies messages to the
power liftgate control module via the PCI bus circuit.
A diagnostic scan tool, such as the DRB III

t or equiv-

alent, is used to read and troubleshoot these DTCs.
Refer to the Body Diagnostic Manual for a complete
list of diagnostic routines.

For additional information, (Refer to 8 - ELECTRI-

CAL/POWER DOORS - OPERATION). Refer to the
appropriate wiring information for complete circuit
schematic or connector pin-out information.

WARNING: BE CERTAIN TO READ ALL WARNINGS
AND CAUTIONS BEFORE ATTEMPTING ANY SER-
VICE OF THE POWER LIFTGATE SYSTEM OR COM-
PONENTS.

OPERATION

With the push of a power liftgate open/close com-

mand switch (key fob or overhead console mounted) a
signal is sent out on the Programmable Communica-
tion Interface (PCI) Data Bus circuit. This signal is
detected at the Body Control Module (BCM). The
BCM then sends a signal out on the PCI Data Bus
circuit to the power liftgate control module. The
power liftgate control module then signals the power
liftgate motor to start an open or close cycle, depend-
ing on what position the liftgate is in.

During a liftgate open or close cycle, if the power

liftgate module detects sufficient resistance to liftgate
travel, such as an obstruction in the path of the lift-
gate, the power liftgate control module will immedi-
ately stop the liftgate movement and reverse travel
to the full open or closed position. The ability for the
power liftgate module to detect resistance to liftgate

Fig. 1 KEY FOB

1 - LEFT SLIDING DOOR SWITCH
2 - RIGHT SLIDING DOOR SWITCH
3 - LIFTGATE SWITCH

8N - 2

POWER LIFTGATE SYSTEM

travel is accomplished by hall effect sensors, drive
motor speed and pinch sensors (tape switches).

Anytime the liftgate is opened or closed using the

power liftgate system the power liftgate control mod-
ule learns from the cycle. If a replacement power lift-
gate component is installed or a liftgate adjustment
is made, the module will relearn the effort and/or
time required to open or close the liftgate. This learn
cycle can be performed with a DRB III

t, or equiva-

lent scan tool, or with a complete cycle of the liftgate,
using any one of the command switches. (Refer to 8 -
ELECTRICAL/POWER DOORS - STANDARD PRO-
CEDURE) for detailed instructions.

The power liftgate system is designed with a num-

ber of system inhibitors. These inhibitors are neces-
sary for safety and / or feasibility of the power
liftgate system. The power liftgate system inhibitors
are:

• The Power Liftgate may not operate in extreme

temperatures. These extreme temperatures will be
approximately less than -12° F (-24.4° C) or greater
than 143° F (61.6° C). A chime/thermister assembly
in the rear light bar assembly monitors the outside
temperature.

• The vehicle transmission must be in Park or

Neutral for the power liftgate to start a cycle.

• If multiple obstacles are detected during the

same power open or close cycle, the liftgate goes into
manual operation.

• If severe problems occur, Diagnostic Trouble

Codes (DTC) are stored in the power liftgate control
module.

POWER LIFTGATE SYSTEM CAUTIONS AND
WARNINGS

WARNING: ALWAYS DISCONNECT THE BATTERY
NEGATIVE

CABLE

BEFORE

ATTEMPTING

ANY

POWER LIFTGATE SYSTEM SERVICE.

WARNING: THERE IS A SMALL AREA ON BOTH
SIDES OF THE LOWER POWER LIFTGATE WHICH
IS

NOT

PROTECTED

PINCH

SENSORS.

EXTREME CARE MUST BE TAKEN TO PREVENT
OBJECTS FROM ENTERING THIS AREA ONCE THE
LIFTGATE

REACHES

THE

SECONDARY

LATCH

CONTACT (APPROXIMATELY 1/2 INCH BEFORE
FULLY CLOSED).

WARNING: NEVER ATTEMPT TO ENTER OR EXIT
THE VEHICLE WITH THE LIFTGATE IN MOTION.
YOU COULD DAMAGE THE POWER LIFTGATE SYS-
TEM AND/OR COMPONENTS AND/OR CAUSE PER-
SONAL INJURY.

WARNING: NEVER STICK OBJECTS IN THE POWER
LIFTGATE WHEN CINCHING CLOSED. YOU COULD
DAMAGE THE VEHICLE, POWER LIFTGATE SYS-
TEM COMPONENTS AND/OR CAUSE PERSONAL
INJURY.

DIAGNOSIS AND TESTING

POWER LIFTGATE SYSTEM

The power liftgate system contains many compo-

nents and modules. In order to obtain conclusive
testing the Programmable Communications Interface
(PCI) data bus network and all of the electronic mod-
ules that provide inputs to, or receive outputs from
the power liftgate system must be checked.

The power liftgate system can be diagnosed with

an appropriate scan tool, such as the DRB III

t or

equivalent. The DRB III

t can be used to observe var-

ious switch statuses throughout the power liftgate
system to help diagnose an inoperative switch or
component. The DRB III

t can also be used to actuate

various components throughout the power liftgate
system to help diagnose an inoperative component.

Before any testing of the power liftgate system is

attempted, the battery should be fully charged, all
built-in power liftgate system inhibitors read and
understood, and all wire harness and ground connec-
tions inspected around the affected areas on the vehi-
cle.

The following are quick reference diagnostic tables

to help when diagnosing and testing the power lift-
gate system.

POWER LIFTGATE SYSTEM

8N - 3

POWER LIFTGATE SYSTEM (Continued)

LIFTGATE SYSTEM DIAGNOSIS

CONDITION

POSSIBLE CAUSES

CORRECTION

Liftgate opens unexpectedly

Inoperative Power Liftgate Module or
Body Control Module (BCM)

Disconnect then reconnect the battery
negative cable to reset module. Cycle the
power liftgate, if the power liftgate is still
not operating properly check for loose wire
connections, refer to the appropriate
diagnostic information

Inoperative latch assembly

Check for blown fuse and loose wiring
connections

Check for Diagnostic Trouble Codes
(DTCs), replace latch as necessary

Inoperative open/close command
switch

Check for shorted or inoperative switch.
Replace switch as necessary

Liftgate will not open from
outside of vehicle manually

Inoperative key cylinder assembly

Check for inoperative key cylinder
assembly. Replace key cylinder as
necessary

Check link rod connections at the latch and
key cylinder assembly

Check for binds or kinks in link rod

Check for foreign matter preventing the
operation of key cylinder assembly

Replace the components as necessary

Inoperative latch assembly

Check for blown fuse and loose wiring
connections

Check for foreign matter preventing the
operation of latch assembly

Replace latch assembly as necessary

Binding or sticking of components

Check for foreign matter preventing the
operation of door

Establish location of binding

Replace the components as necessary

Liftgate will not open/close
under power

Inoperative Power Liftgate Module or
BCM

Inoperative latch assembly

Check for blown fuse and loose wiring
connections

Check for foreign matter preventing the
operation of latch assembly

Refer to the appropriate diagnostic
information. Replace latch assembly as
necessary

8N - 4

POWER LIFTGATE SYSTEM

POWER LIFTGATE SYSTEM (Continued)

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Chrysler RG Voyager. Manual — part 732

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