The eight-way power seat is also available with the
heated seat and memory seat system that automati-
cally positions the power seat for two different driv-
ers. Refer to Heated Seats for more information on
the heated seat option. Refer to Description Mem-
ory Seat System in this section for more informa-
tion on the memory seat system.
The power seat system includes the following com-
ponents:
• Power seat recliners
• Power seat switches
• Power seat tracks
• Circuit breaker
The power seat system with memory and heated
seat options includes the following components:
• Power seat recliner
• Power seat switch
• Power seat track.
• Memory Seat Mirror Module (MSMM)
• Memory set switch
• Heated Seat Module (HSM)
• Heated seat switch
• Electronic Vehicle Information Center (EVIC)
• Programmable Communications Interface (PCI)
data bus network
Refer to Wiring Diagrams for complete circuit dia-
grams. Following are general descriptions and opera-
tions for the major components in the power seat
system and memory seat system.
DESCRIPTION - MEMORY SYSTEM
An electronic memory system is available on some
models. The memory system is able to store and
recall the driver side power seat positions (including
the power recliner position) and both outside side
view mirrors positions for two drivers. On vehicles
equipped with a factory radio, the memory system is
also able to store and recall radio station presets 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 preset stations.
The memory system will automatically return to
its preset settings when the corresponding numbered
button of the memory switch is depressed, or when
the doors are unlocked using the corresponding
Remote Keyless Entry (RKE) transmitter. A customer
programmable feature of the memory system allows
the RKE recall of memory features to be disabled, if
desired. This programmable feature is internal in the
EVIC module, which is located in the overhead con-
sole.
A Memory Seat Mirror Module (MSMM) is used on
some models to control and integrate the many elec-
tronic functions and features included in the memory
seat and mirror systems.
The memory system includes the following compo-
nents:
• Memory Seat Mirror Module (MSMM)
• Memory set switch
• Position potentiometers on both outside side
view mirrors
• Position potentiometers on the driver side power
seat track and power seat recliner motors.
• Electronic Vehicle Information Center (EVIC)
• Radio receiver (if PCI data bus capable).
Certain functions of the memory system rely upon
resources shared with other electronic modules in the
vehicle over the Programmable Communications
Interface (PCI) J1850 data bus network. The PCI
data bus network allows the sharing of sensor infor-
mation. This helps to reduce wire harness complexity,
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 capabilities.
Initial diagnosis of these electronic modules or the
PCI data bus network requires the use of a DRB IIIt
scan tool and the proper Diagnostic Procedures man-
ual. If this method does not prove conclusive, the use
of a automotive meter such as the Fluket, the proper
wiring schematics and the service manual diagnostic
routines are required.
The other electronic modules that may affect mem-
ory system operation are as follows:
Fig. 1 Identifying a Side Airbag Equipped Seat
1 - Airbag Label
8N - 52 POWER SEAT SYSTEM RS
POWER SEAT SYSTEM (Continued)
To Next Page