continue closing until fully closed. If the outside
handle is activated during an open cycle, the PLG
will become a full manual liftgate. If the outside
handle is activated during a close cycle, the PLG
shall reverse direction of travel to the full open
position.
In the event of a complete power failure with the
liftgate, it can be opened by removing the 25mm
plug at the lower trim of the liftgate near the latch
and using a screwdriver, trip the latch. See Service
Information for a detailed explanation. This will
work for the non-power liftgate also.
3.17.2
DIAGNOSTIC FEATURES
The PLGM can be flashed on vehicle via PCI Bus
with a DRBIII
t diagnostic tool. The DRBIIIt can
read all inputs, actuate all outputs, read module
information, and read diagnostic trouble codes. As
a reminder, some DTC’s can be set during normal
PLG operation.
3.17.3
SYSTEM INHIBITORS
1. Battery voltage too high or too low (above 16V,
below 9.5V)
2. Vehicle in gear
3. Vehicle speed > 0 mph (0 km/h)
4. Outside temperature too high, above 179.6°F
(82°C) or too low, below -22°F (-30°C).
5. Liftgate locked will inhibit the interior switch
from opening (overhead console). A locked lift-
gate can be power closed.
6. Pinch Sensor switch stuck shall inhibit the
power close feature.
3.18
POWER SEAT SYSTEMS
3.18.1
POWER SEAT - DRIVER
The memory power seat provides the driver with
2 position settings for the driver’s seat. Each power
seat motor is connected to the MHSAPM/MSAPM
with two motor drive circuits. Each circuit is
switched between battery and ground. By being
able to bi-directionally drive the circuits, the
MHSAPM/MSAPM controls the movement of the
motors based on input from the power seat switch
or from the position sensors when performing a
memory recall. Each motor contains a potentiome-
ter to monitor the seat position. To monitor the
position of the motor, the MHSAPM/MSAPM sends
out a 5-volt reference on the sensor supply circuit.
The sensor is grounded back to the module on a
common ground circuit. Based on the position of
the sensor, the MHSAPM/MSAPM monitors the
voltage change through the sensor on a separate
signal circuit.
The MHSAPM/MSAPM stores the input value of
each of the four seat potentiometers in memory
when the system requests a set. The driver can
initiate a memory recall, using either the door
mounted memory switch or the RKE transmitter
(if the remote linked to memory feature is enabled
via the EVIC). When initiated, the MHSAPM/
MSAPM adjusts the four seat sensors (by using the
motors) to match the memorized seat position data.
For safety, the memory seat recall is disabled by
the MHSAPM/MSAPM when the vehicle is out of
park position or if the speed is not zero. Any
obstruction to seat movement over a 2-second delay
will cause the seat to stop moving in which case a
stalled motor would be detected by the MHSAPM/
MSAPM and the corresponding seat output would
be deactivated. However, if the object obstructing
the seat is removed, the seat will function normally
again.
3.18.2
POWER SEAT - PASSENGER
The passenger power seat is controlled by the
MHSAPM/MSAPM through PCI BUS messages
sent from the PDM. However, there are no memory
features with the passenger seat.
3.18.3
MEMORY SYSTEM
The memory system consists of the driver’s
power seat, power mirrors, adjustable pedals, and
radio presets. Refer to Memory Master under Door
Modules in this general information section for
additional information.
The Memory Heated Seat Adjustable Pedal Mod-
ule (MHSAPM) or the Memory Seat Adjustable
Pedal Module (MSAPM) for vehicles equipped
without heated seats are located under the driver’s
seat. It receives input from the following:
•
driver’s seat position sensors
•
PCI Bus circuits
The MHSAPM/MSAPM uses these inputs to per-
form the following functions:
•
position the driver’s memory seat to the memory
preset position
•
position the pedals to the memory preset posi-
tion
•
send/receive memory system information over
the PCI Bus.
The Memory Set Switch is wired to the Driver
Door Module (DDM). After pressing the Memory
Set Switch (#1 or #2), the DDM receives and
interprets the analog signal and then sends a PCI
Bus message to the MHSAPM/MSAPM to set or
33
GENERAL INFORMATION