LATCH
DESCRIPTION
The power cinch/release latch performs the same
features as a manual liftgate latch as well as the
power cinch and / or release capability. A second type
of power latch can also be found on some vehicles,
this latch is designed to perform a power release
only. The power cinch and release capability is
accomplished by an actuator mounted to the leading
edge of the latch assembly. The latch is located in the
lower center of the power liftgate assembly (Fig. 8)
and contains integral pawl and ratchet switches. The
ratchet switch also acts as a liftgate ajar switch. The
power latch assembly can be serviced as a complete
assembly, latch without actuator or just the actuator.
OPERATION
On the power cinch/release latch, the latch
mounted actuator provides the torque required to
close the power liftgate from the secondary to the pri-mary closed and latched position. On the power
cinch/release latch and the power release only latch,
the actuator releases the liftgate from the primary
closed and latched position to the fully unlatched and
movable position.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Open the liftgate and remove the liftgate trim
panel, (Refer to 23 - BODY/DECKLID/HATCH/LIFT-
GATE/TAILGATE/TRIM PANEL - REMOVAL).
(3) Disconnect the power latch electrical connector
(Fig. 9).
(4) Remove the power latch retaining bolts.
(5) Disconnect the liftgate lock cylinder link rod
(Fig. 9) from the key cylinder or latch assembly. To
disconnect from latch, rotate the plastic retaining clip
90 É to unsnap clip from linkrod. Then pull link rod
straight out of latch arm.
(6) Remove the power latch from the vehicle.
Fig. 8 POWER LATCH ORIENTATION
1 - LATCH & ACTUATOR ASSEMBLY
2 - LATCH ELECTRICAL CONNECTOR
3 - LOCK CYLINDER LINK ROD
4 - LIFTGATE LOCK CYLINDER
Fig. 9 POWER LATCH ORIENTATION
1 - LATCH & ACTUATOR ASSEMBLY
2 - LATCH ELECTRICAL CONNECTOR
3 - LOCK CYLINDER LINK ROD
4 - LIFTGATE LOCK CYLINDER
8N - 12 POWER LIFTGATE SYSTEMRS
INSTALLATION
(1) Position the power latch in the vehicle.
(2) Connect the liftgate lock cylinder link rod (Fig.
10) on the cinch latch assembly. Rotate the plastic
retaining clip 90 É to lock retaining clip onto the link
rod.
(3) Connect the link rod on the lock cylinder.
(4) Install three new power latch retaining bolts.
Torque to 10 N´m (90 in. lbs.).
(5) Connect the power latch electrical connector
and secure push pin retainers.
(6) Connect the battery negative cable.
(7) Using an appropriate scan tool, check and
erase any power liftgate control module diagnostic
trouble codes related to the power latch.
(8) 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.
(9) 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.
(10) Install the liftgate trim panel, (Refer to 23 -
BODY/DECKLID/HATCH/LIFTGATE/TAILGATE/
TRIM PANEL - INSTALLATION).
LATCH ACTUATOR
DESCRIPTION
The power cinch and/or power release latch (Fig.
11) is made possible by a latch actuator attached to
the leading edge of the power latch assembly. This 12
volt latch actuator contains a small drive gear that
meshes with the latch assemblies internal gears to
perform the power cinch close / power release opera-
tions. (Refer to 8 - ELECTRICAL/POWER DOORS/
LATCH - DESCRIPTION) for additional information.
The power cinch/release actuator is serviceable com-
ponent.
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 battery negative
cable.
Fig. 10 POWER LATCH ORIENTATION
1 - LATCH & ACTUATOR ASSEMBLY
2 - LATCH ELECTRICAL CONNECTOR
3 - LOCK CYLINDER LINK ROD
4 - LIFTGATE LOCK CYLINDER
Fig. 11 POWER LATCH ORIENTATION
1 - LATCH & ACTUATOR ASSEMBLY
2 - LATCH ELECTRICAL CONNECTOR
3 - LOCK CYLINDER LINK ROD
4 - LIFTGATE LOCK CYLINDER
RSPOWER LIFTGATE SYSTEM8N-13
LATCH (Continued)
(2) Open the liftgate and remove the lower liftgate
trim panel. (Refer to 23 - BODY/DECKLID/HATCH/
LIFTGATE/TAILGATE/TRIM PANEL - REMOVAL).
(3) Disconnect the power latch electrical connector
(Fig. 12).
(4) Remove the three latch retaining bolts.
(5) Grab the latch assembly and unhook the key
cylinder link rod from the key cylinder (Fig. 12).
(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.
(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 onto the latch assem-
bly.
(2) Install the three latch actuator retaining
screws.
(3) Install the three wires in the main latch elec-
trical connector.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 the appropriate
wiring information for complete circuit schematic or
connector pin-out information.
(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 (Fig. 13).
(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
(Fig. 13).
(8) Install the lower liftgate trim panel, (Refer to
23 - BODY/DECKLID/HATCH/LIFTGATE/TAIL-
GATE/TRIM PANEL - INSTALLATION).
(9) Connect the battery negative cable.
(10) Using an appropriate scan tool, check and
erase any power liftgate control module diagnostic
trouble codes related to the power latch.
(11) 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.
(12) 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.
Fig. 12 POWER LATCH ORIENTATION
1 - LATCH & ACTUATOR ASSEMBLY
2 - LATCH ELECTRICAL CONNECTOR
3 - LOCK CYLINDER LINK ROD
4 - LIFTGATE LOCK CYLINDER
Fig. 13 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 ACTUATOR (Continued)
LIFTGATE MOTOR
DESCRIPTION
The gear motor assembly (Fig. 14) 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 provides the power and torque required to
open or close the liftgate. The hall effect sensor is used
to provide the liftgate control module with a speed read-
ing, which is used to monitor the resistance of liftgate
travel. This speed reading also allows the power liftgate
control module to detect obstructions and move the lift-
gate 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
approaching the full open position.
Serviceable components of the power liftgate gear/mo-
tor assembly are the complete gear/motor assembly,
motor and wire harness, lift gear and control rod,
engage actuator, full open switch and the transverse
bracket.
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 liftgate
from its primary closed and latched position to the
released and movable position. The liftgate motor-
mounted engage actuator then engages the liftgatemotor 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 in 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 battery negative cable.
(2) Remove the left rear D-pillar trim panel from
the vehicle, (Refer to 23 - BODY/INTERIOR/LEFT
D-PILLAR TRIM PANEL - REMOVAL).
(3) Disconnect the wire harness connector from the
motor assembly (Fig. 15).
(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.
Fig. 14 POWER LIFTGATE COMPONENTS
1 - POWER LIFTGATE GEAR MOTOR/ASSEMBLY
2 - POWER LIFTGATE CONTROL MODULE
3 - ELECTRICAL GROUND LOCATION
Fig. 15 POWER LIFTGATE COMPONENTS
1 - POWER LIFTGATE GEAR MOTOR/ASSEMBLY
2 - POWER LIFTGATE CONTROL MODULE
3 - ELECTRICAL GROUND LOCATION
RSPOWER LIFTGATE SYSTEM8N-15
INSTALLATION
(1) Using the motor housing tab, hook the liftgate
motor assembly on the D-pillar.
(2) Install the three motor assembly retaining
bolts. Torque the two rear most bolts first to 9.5 N´m
(85 in. lbs.). Torque the remaining bolt next to the
window actuator to 9.5 N´m (85 in. lbs.).
(3) Connect the liftgate motor assembly electrical
connector.
(4) Install the D-pillar trim panel on the vehicle,
(Refer to 23 - BODY/INTERIOR/LEFT D-PILLAR
TRIM PANEL - INSTALLATION).
(5) Connect the battery negative cable.
(6) Using an appropriate scan tool, check any
erase any power liftgate control module diagnostic
trouble codes related to the door motor assembly.
(7) Verify power liftgate system 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.
LIFT GEAR & LINK ROD
DESCRIPTION
The lift gear and rod assembly are located in the
left rear of the vehicle and are visible without remov-ing the D-pillar trim (Fig. 16). The lift gear provides
the leverage to move the liftgate from the closed to
the open position. The lift gear attaches to a bearing
on the gear motor assembly with four bolts. On the
outboard side of the lift gear are riveted on teeth,
which mesh with the gear motor assembly drive
gears during a open or close operation. The rod
assembly is a steel shaft, equipped with two spheri-
cal rod ends which attaches the lift gear to the lift-
gate. The lift gear and rod assembly are serviceable
components.
OPERATION
One end of the rod assembly is attached to the lift-
gate, the other attached to the lift gear. When the lift
gear is driven by the gear motor assembly the lift-
gate is moved to the open or closed position.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the left rear D-pillar trim panel from
the vehicle, (Refer to 23 - BODY/INTERIOR/LEFT
D-PILLAR TRIM PANEL - REMOVAL).
(3) Remove the lift gear retaining bolts (Fig. 17).
(4) Remove the lift gear and rod from the vehicle.
Fig. 16 LIFTGATE GEAR/MOTOR ASSEMBLY
1 - TRANSVERSE BRACKET
2 - ENGAGE ACTUATOR
3 - LIFT GEAR AND ROD ASSEMBLY
4 - LIFTGATE MOTOR
Fig. 17 LIFTGATE GEAR MOTOR ASSEMBLY
1 - ENGAGE ACTUATOR RETAINING SCREWS
2 - LIFT GEAR RETAINING BOLTS
8N - 16 POWER LIFTGATE SYSTEMRS
LIFTGATE MOTOR (Continued)
INSTALLATION
(1) Position the lift gear and rod assembly and
install the retaining bolts (Fig. 18). Torque the bolts
to 8 N´m (71 in. lbs.).
(2) Install the D-pillar trim panel on the vehicle,
(Refer to 23 - BODY/INTERIOR/LEFT D-PILLAR
TRIM PANEL - INSTALLATION).
(3) Connect the battery negative cable.
(4) Using an appropriate scan tool, check any
erase any power liftgate control module diagnostic
trouble codes related to the door motor assembly.
(5) Verify power liftgate system 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.
CAUTION: Torque link rod to liftgate attachment
bolt to 250 in. lbs. Care must be taken not to over-
torque link rod bolt.
PINCH SENSOR
DESCRIPTION
Pinch sensors are located on each side of the lift-
gate (Fig. 19). These sensors look like weather-strips,
however they consist of pieces of electrically conduc-
tive rubber (tapeswitch), wires, resistor, double sided
tape, and a plastic carrier. They are used to indicate
an obstruction during a power liftgate close cycle.
OPERATION
During a power liftgate close cycle, if either of the
two conductive rubber strips (tapeswitch) of the
pinch sensor come in contact with an obstacle, the
pinch sensor circuit is completed. This tells the
power liftgate control module that a obstruction is
felt. The control module will stop the liftgate imme-
diately and return it to the full open position.
Fig. 18 LIFTGATE GEAR MOTOR ASSEMBLY
1 - ENGAGE ACTUATOR RETAINING SCREWS
2 - LIFT GEAR RETAINING BOLTS
Fig. 19 PINCH SENSOR LOCATION
1 - LIFTGATE
2 - PINCH SENSOR ASSEMBLY
3 - LIFTGATE PROP ROD
4 - PINCH SENSOR WIRE HARNESS CONNECTOR
5 - PINCH SENSOR WIRE HARNESS
RSPOWER LIFTGATE SYSTEM8N-17
LIFT GEAR & LINK ROD (Continued)
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove trim panel from liftgate, (Refer to 23 -
BODY/DECKLID/HATCH/LIFTGATE/TAILGATE/
TRIM PANEL - REMOVAL).
(3) Disconnect the pinch sensor wire harness con-
nector (Fig. 20).
(4) Remove screws holding the pinch sensor to lift-
gate.
(5) Feed the pinch sensor wire harness out of the
liftgate and remove the sensor from the vehicle.
INSTALLATION
WARNING: USE EXTREME CAUTION WHEN TEST-
ING PINCH SENSOR OPERATION.
CAUTION: Ensure liftgate surface is clean and dry
prior to pinch sensor installation. Failure to do so
will inhibit the adhesive backings ability to adhere
to the liftgate and cause improper system operation
or premature component failure.
(1) Position the pinch sensor to the liftgate.
(2) Install the third screw from the top of the sen-
sor first.Do not torque screw at this time.(3) Install the remaining three screws holding the
sensor to the liftgate. Torque all screws to 25 in. lbs.
(4) Install wire harness grommet in liftgate flange
and route, connect the pinch sensor wire harness
connector (Fig. 21).
(5) Remove protective tap from the top of the
pinch sensor. Firmly apply pressure to the sensor
adhesive to secure it to the liftgate.
(6) Install the trim panel on the liftgate, (Refer to
23 - BODY/DECKLID/HATCH/LIFTGATE/TAIL-
GATE/TRIM PANEL - INSTALLATION).
(7) Connect the battery negative cable.
(8) Using an appropriate scan tool, check and
erase any power liftgate control module diagnostic
trouble codes related to the pinch sensor.
(9) Verify power liftgate system and pinch sensor
operation. Cycle the power liftgate through one com-
plete open and close cycle, during the final close cycle
press the pinch sensor to verify the power liftgate
detects an obstruction and returns to the full open
position.
Fig. 20 PINCH SENSOR LOCATION
1 - LIFTGATE
2 - PINCH SENSOR ASSEMBLY
3 - LIFTGATE PROP ROD
4 - PINCH SENSOR WIRE HARNESS CONNECTOR
5 - PINCH SENSOR WIRE HARNESS
Fig. 21 PINCH SENSOR LOCATION
1 - LIFTGATE
2 - PINCH SENSOR ASSEMBLY
3 - LIFTGATE PROP ROD
4 - PINCH SENSOR WIRE HARNESS CONNECTOR
5 - PINCH SENSOR WIRE HARNESS
8N - 18 POWER LIFTGATE SYSTEMRS
PINCH SENSOR (Continued)
TRANSVERSE BRACKET
DESCRIPTION
The transverse bracket (Fig. 22) is used to support
and secure the power liftgate gear/motor assembly to
the left rear body D-pillar. The transverse bracket is
a serviceable power liftgate component.
OPERATION
The power liftgate transverse bracket supports the
gear motor assembly by supplying an additional
attachment point. Located on the leading edge of the
gear motor assembly, one end of the transverse
bracket attaches to the motor assembly the other to
the leading edge of the vehicles D-pillar.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the left D-pillar trim from the vehicle,
(Refer to 23 - BODY/INTERIOR/LEFT D-PILLAR
TRIM PANEL - REMOVAL).
(3) Disconnect the gear motor assembly electrical
connector and disengage retaining pushpin.
(4) Loosen the gear motor assembly retaining bolts
to allow room for transverse bracket to be removed.
(5) Remove the transverse bracket retaining bolts
(Fig. 23).
(6)
Remove the transverse bracket from the vehicle.
INSTALLATION
(1) Position the transverse bracket in the vehicle.
Be certain the transverse bracket is properly posi-
tioned. The bracket should just touch the engage
actuator arm and be positioned between the actuator
arm and the motor housing.
(2) Torque the transverse bracket retaining bolts
to the gear motor assembly to 9.5 N´m (85 in. lbs.).
Do not tighten the transverse bracket retaining bolt,
located under the window actuator at this time.
(3) Torque the gear motor assembly retaining bolts
to 9.5 N´m (85 in. lbs.).
(4) Torque the final transverse bracket retaining
bolt to 9.5 N´m (85 in. lbs.).
(5) Connect the gear motor assembly electrical con-
nector and engage retaining pushpin.
(6) Install the left D-pillar trim, (Refer to 23 -
BODY/INTERIOR/LEFT D-PILLAR TRIM PANEL -
INSTALLATION).
(7) Connect the battery negative cable.
(8) Using an appropriate scan tool, check any
erase any power liftgate control module diagnostic
trouble codes related to the door motor assembly.
(9) Verify power liftgate system 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.
Fig. 22 LIFTGATE GEAR/MOTOR ASSEMBLY
1 - TRANSVERSE BRACKET
2 - ENGAGE ACTUATOR
3 - LIFT GEAR AND ROD ASSEMBLY
4 - LIFTGATE MOTOR
Fig. 23 LIFTGATE GEAR MOTOR ASSEMBLY
1 - TRANSVERSE BRACKET
2 - ENGAGE ACTUATOR
3 - LIFT GEAR AND ROD ASSEMBLY
4 - LIFTGATE MOTOR
RSPOWER LIFTGATE SYSTEM8N-19