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GENERAL INFORMATION
closes. If the doors are closed and the ignition
switch is turned on, the illuminated entry also
cancels. The illuminated entry feature will not
operate if the courtesy lamp switch is in the dome
off position.
3.12.3 INTERIOR LIGHTING BATTERY
SAVER
If any of the interior lamps are left on after the
ignition is turned off, the BCM will turn them off
after 8 minutes. To return to normal operation, the
courtesy lamps will operate after the dome lamp
switch or door ajar switch changes state. The glove
box and switched reading lamps require that the
ignition be turned to the on/acc position.
3.13 MEMORY SYSTEM
The memory system consists of power driver's
seat, power mirror and radio presets. The Memory
Seat/Mirror Module (MSMM) is located under the
driver's seat. It receives input from the following:
driver's manual 8-way seat switch, driver's seat
position sensors, PCI bus circuits, and the power
mirror sensors. The module uses these inputs to
perform the following functions: position the driv-
er's memory seat, both exterior mirrors (during
recalls), and send/receive the memory system infor-
mation over the PCI bus.
The Memory Set Switch is wired to the Body
Control Module (BCM). A button (either #1 or #2)
pressed on the set switch causes the BCM to send a
message to the MSMM which in turn will send a
motion status message back to the BCM. If the
message from the MSMM indicates no current
motion, the BCM will send a recal message to the
module. The MSMM will set the seat, exterior
mirror and radio to the presets for the indicated
driver.
If any one of the memory controlled systems is
inoperative from its manual switch, use the sche-
matics and diagnostic information to correct the
concern. This manual addresses the memory prob-
lems only and it is assumed there is not a basic
component failure.
3.13.1 POWER SEAT
The memory power seat provides the driver with
2 position settings for the driver's seat. Each power
seat motor is connected to the MSMM with two
motor drive circuits. Each circuit is switched be-
tween battery and ground. By being able to bi-
directionally drive the circuits, the MSMM 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 potentiometer to monitor the seat posi-
tion. To monitor the position of the motor, the
MSMM 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 MSMM monitors the
voltage change through the sensor on a separate
signal circuit.
The MSMM stores the input value of each of the
four seat potentiometers in memory when the sys-
tem requests a set. The driver can initiate a mem-
ory 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 MSMM 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 MSMM 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 MSMM and the corresponding
seat output would be deactivated. However, if the
object obstructing the seat is removed, the seat will
function normally again.
3.13.2 MEMORY MIRRORS
The driver sideview mirror contains vertical and
horizontal bi-directional drive positioning motors
and position sensors. The MSMM provides a 5-volt
reference on the signal circuit to each position
sensor. The sensors share a common ground circuit.
The MSMM monitors the position of the mirror
motors by measuring the voltage on each signal
circuit. When a memory position is set, the MSMM
monitors and stores the position of the outside
mirror. The MSMM adjusts the mirror to the appro-
priate positions when a memory recall message is
received from the RKE or is requested from the
memory set switch.
The power mirror switch during non-memory
operation operates the mirror independently of the
MSMM.
3.14 OVERHEAD CONSOLE
COMPASS/TEMPERATURE MODULE,
COMPASS/MINI-TRIP COMPUTER or
ELECTRONIC VEHICLE INFORMATION CENTER
The
Compass/Temperature
Compass/Mini-Trip Computer (CMTC) or Elec-
tronic Vehicle Information Center (EVIC) is located
in the overhead console. The CT provides the vehi-
cle operator with only outdoor temperature and the
compass heading. The CMTC or EVIC supplements
the standard vehicle instrumentation. The CMTC
26
Module
(CT),
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