Power Seats; Description - Memory Seat System - Chrysler 300M Service Manual

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POWER SEATS

POWER SEATS (Continued)
• Power Seat Recliner - Two power seat reclin-
ers are used per vehicle. One seat recliner is used for
each front seat. The power seat recliner replaces the
manual seat recliner found on low-line LH vehicles.
Refer to power seat recliner later in this section for
additional information.
• Power Seat Switches - Two power seat
switches are used per vehicle. One seat switch is
used for each front seat. Each switch is mounted in
the appropriate seat cushion side shield. Refer to the
appropriate power seat switch later in this section for
additional information.
Refer to Wiring Diagrams for complete circuit dia-
grams. Following are general descriptions and opera-
tions for the major components in the power seat and
memory seat systems.

DESCRIPTION - MEMORY SEAT SYSTEM

An electronic memory seat system is available on
some LH models. The memory system is able to store
and recall all driver side power seat positions, and
the drivers side view mirror positions. The system
can be set for two different drivers. On vehicles with
a factory installed radio connected to the Program-
mable Communications Interface (PCI) data bus net-
work, the memory system is also able to store and
recall up to twenty radio station presets (ten AM and
ten FM), also for two drivers. The memory system
also will store and recall the last station listened to
for each driver, even if it is not one of the twenty pre-
set stations.
The memory system will automatically recall all of
these settings when a button of the memory switch is
depressed, or when the doors are unlocked using the
Remote Keyless Entry
enabled). If the vehicle has more than two drivers
the RKE transmitter recall of memory features can
be disabled. This is a customer programmable fea-
ture of the overhead console. Refer to the Overhead
Console section of this manual for additional infor-
mation.
The memory system also has a easy exit feature
that will move the driver seat rearward 55 millime-
ters or to the end of its travel, whichever occurs first,
when the key is removed from the ignition switch
lock cylinder. This is a customer programmable fea-
ture of the overhead console. Refer to the Overhead
Console section of this manual for additional infor-
mation.
A Memory Heated Seat Mirror Module (MHSMM)
is used to control and integrate the many electronic
functions and features included in the memory seat/
mirror and heated seat systems.
(RKE) transmitter
The memory system includes the following compo-
nents:
• Memory
(MHSMM) - This module contains the solid state
electronic control and diagnostic logic circuitry for
the heated seat and memory seat/mirror systems.
One module is used per vehicle and is mounted
under the drivers front seat cushion. Refer to the
Electronic Control Module section of this manual for
additional information.
• Memory Set/Selector Switch - One switch is
used per vehicle and is mounted in the drivers seat
cushion side shield. Refer to the Memory Set Switch
later in this section of this manual for additional
information.
• Position Potentiometers - Drivers Mirror -
The potentiometer is permanently installed on the
drivers side view mirror motor. This potentiometer is
used to provide a reference signal to the memory
heated seat mirror module, letting the module know
the exact position of the mirror.
• Position Potentiometers - Seat Track -
These potentiometers are permanently installed in
each of the power seat track motors. They are used
to provide a reference signal to the memory heated
seat mirror module, letting the module know the
exact position of the seat cushion and recliner. Refer
to Power Seat Track later in this section of the man-
ual for additional information.
• RKE Transmitter - The RKE transmitter is
attached to the key ring supplied with the vehicle.
This device is used to recall preset memory positions
as well as other features. Refer to the Power Locks
section of this manual for additional information.
• Radio Receiver - The radio is also part of the
(if
memory system and if the radio is PCI data bus
capable, multiple radio station presets can be pro-
grammed into the memory system also. Refer to the
Audio section of this manual for additional informa-
tion.
Certain functions and features of the memory sys-
tem rely upon resources shared with other electronic
modules in the vehicle over the Programmable Com-
munications Interface (PCI) data bus network. The
PCI data bus network allows the sharing of sensor
information. This helps to reduce wire harness com-
plexity, internal controller hardware, and component
sensor current loads. At the same time, this system
provides increased reliability, enhanced diagnostics,
and allows the addition of many new feature capabil-
ities. For diagnosis of these electronic modules or of
the PCI data bus network, the use of a DRB scan
tool and the proper Diagnostic Procedures manual
are recommended.
Heated Seat Mirror
LH
Module