Chrysler Concorde 2004 Service Manual page 1614

8E - 6 ELECTRONIC CONTROL MODULES
DATA LINK CONNECTOR (Continued)
OPERATION
The data link connector (diagnostic connector)
links the DRB scan tool with the Powertrain Control
Module (PCM). Refer to On-Board Diagnostics in the
General Diagnosis section of this group.
MEMORY HEATED SEAT/
MIRROR MODULE
DESCRIPTION
Fig. 3 Memory Heated Seat/Mirror Module (MHSMM)
1 - MEMORY HEATED SEAT/MIRROR MODULE
2 - RECLINER MOTOR
3 - SEAT HEATER 4–WAY CONNECTOR
4 - SEAT BACK HEATER 2–WAY CONNECTOR
5 - REAR RISER
6 - FRONT RISER
7 - HORIZONTAL MOTOR
A Memory Heated Seat/Mirror Module (MHSMM) is
used on vehicles that are equipped with the heated
seat system option. The module is used to control all of
the driver side seat/mirror memory functions and both
the driver and passenger heated seat functions. The
memory heated seat/mirror module contains a central
processing unit and interfaces with the Programmable
Communications Interface (PCI) data bus network.
Refer to the Heated Seats section of this manual for
more information on the heated seat system.
The module is packaged in a black molded plastic
case which is mounted under the forward edge of the
driver side front seat cushion (Fig. 3). This location
makes it somewhat difficult to remove because it sits
between the power seat track and the seat cushion
frame. However, it can be removed without having to
remove the drivers seat, refer to the procedure in
this section for detailed instructions.
Location
For diagnosis of the MHSMM or the PCI data bus,
a DRB III scan tool and the Service/Diagnostic Pro-
cedures manual are recommended. The Memory
Heated Seat/Mirror Module cannot be adjusted or
repaired and, if faulty or damaged, it must be
replaced.
OPERATION
The Memory Heated Seat/Mirror Module controls
the heated seat and memory seat, mirror systems.
However different, these two systems share some
software programmed into the module. Refer to the
following text which explains how the two different
systems are controlled by the memory heated seat/
mirror module.
HEATED SEAT SYSTEM OPERATION
The Memory Heated Seat/Mirror Module receives
hard wired inputs from the heated seat switches and
the heated seat sensors located, on each of the front
seats. The programmed software in the MHSMM
allows it to know the temperature of the seat by a
resistance reading generated from the seat cushion
element mounted thermistor (Heated Seat Tempera-
ture Sensor). When a heated seat switch is depressed
the module will power the appropriate heating ele-
ment until the correct
achieved. Refer to heated seat switch, element and
sensor descriptions for additional information.
MEMORY SEAT/MIRROR SYSTEM OPERATION
The Memory Heated Seat/Mirror Module receives
hard wired inputs from the memory seat switch and
the potentiometers, mounted on each of the driver
power seat track motors and both side view mirrors.
The programmed software in the MHSMM allows it
to know where the seat/mirror is located in its
designed travel by a resistance reading generated
from the seat track or mirror mounted potentiometer.
This way, when the memory switch is depressed the
module will power the seat track or mirror motors
until the correct preset location is achieved. The
MHSMM will prevent the seat memory recall func-
tion from being initiated if the transmission gear
selector lever is not in the Park or Neutral positions,
or if the vehicle is moving. These inputs are moni-
tored over the PCI data bus circuit.
DIAGNOSIS AND TESTING - MEMORY HEATED
SEAT/MIRROR MODULE
In order to obtain conclusive testing of the memory
heated seat/mirror module, the Programmable Com-
munications Interface (PCI) data bus circuit and any
components that provide inputs to the module must
be checked.
LH
preset temperature is