Power Seat Systems - Jeep 1996 Grand Cherokee Service Manual

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GENERAL INFORMATION
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1
MEMORY SYSTEM . . . . . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION AND OPERATION
CIRCUIT BREAKER . . . . . . . . . . . . . . . . . . . . . . . 3
MEMORY SEAT MODULE . . . . . . . . . . . . . . . . . . 1
POWER LUMBAR ADJUSTER/MOTORS . . . . . . . 2
POWER LUMBAR SWITCH . . . . . . . . . . . . . . . . . 2
POWER RECLINER ADJUSTER/MOTORS . . . . . 2
POWER SEAT ADJUSTER/MOTORS . . . . . . . . . . 2
POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . . 2
DIAGNOSIS AND TESTING
CIRCUIT BREAKER . . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL INFORMATION
INTRODUCTION
Six-way driver and passenger power front seats
with power recliners and power lumbar supports is
an available factory-installed option for this model.
The power seat system receives battery feed through
a fuse in the power distribution center and a circuit
breaker in the junction block at all times.
Following are general descriptions of the major
components in the power seat system. Refer to 8W-63
- Power Seat in Group 8W - Wiring Diagrams for
complete circuit descriptions and diagrams.
MEMORY SYSTEM
An electronic memory system is an available option
on this model. The memory system is able to store
and recall the driver's power seat positions (including
power lumbar and recliner positions), both outside
power mirror positions, and ten radio station presets
(including last station tuned) for two drivers. The
memory system will automatically return to all of
these settings when the corresponding button (Driver
1 or 2) of the memory switch on the driver's front
door trim panel is depressed, or when the doors are
unlocked using the corresponding (Driver 1 or 2)
Remote Keyless Entry (RKE) transmitter.
The Driver Door Module (DDM) receives hard-
wired input from the memory set/select switch on the
driver's front door trim panel. The DDM also receives
messages on the Chrysler Collision Detection (CCD)
data bus network from the Remote Keyless Entry

POWER SEAT SYSTEMS

CONTENTS
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REMOVAL AND INSTALLATION
(RKE) receiver in the Passenger Door Module (PDM)
for the memory select function. The DDM processes
these inputs and sends messages to the radio, the
PDM, and the Memory Seat Module (MSM) on the
CCD data bus for memory recall.
sensor information. This helps to reduce wiring har-
ness complexity, reduce internal controller hardware,
and reduce component sensor current loads. At the
same time, this system provides increased reliability,
enhanced diagnostics, and allows the addition of
many new feature capabilities.
for the conventional power seat system components.
For additional information on the features and func-
tions of the memory system, refer to the vehicle own-
er's manual. For diagnosis of the memory system,
use of a DRB scan tool and the proper Body Diagnos-
tic Procedures Manual are recommended.
DESCRIPTION AND OPERATION
MEMORY SEAT MODULE
inboard side of the driver's front seat cushion, is used
on this model to control all of the driver's power seat
memory functions and features. The MSM contains a
central processing unit and interfaces with other
modules in the vehicle on the Chrysler Collision
Detection (CCD) data bus network.
power seat switch, the power lumbar switch, and the
POWER SEAT SYSTEMS
POWER LUMBAR ADJUSTER/MOTOR . . . . . . . . 4
POWER LUMBAR SWITCH . . . . . . . . . . . . . . . . . 4
POWER RECLINER ADJUSTER/MOTOR . . . . . . . 4
POWER SEAT ADJUSTER/MOTORS . . . . . . . . . . 4
POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . . 3
POWER SEAT SYSTEM . . . . . . . . . . . . . . . . . . . 3
MEMORY SEAT MODULE . . . . . . . . . . . . . . . . . . 6
POWER LUMBAR ADJUSTER/MOTOR . . . . . . . . 6
POWER LUMBAR SWITCH . . . . . . . . . . . . . . . . . 5
POWER RECLINER ADJUSTER/MOTOR . . . . . . . 6
POWER SEAT ADJUSTER/MOTORS . . . . . . . . . . 5
POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . . 5
The CCD data bus network allows the sharing of
This group covers only the diagnostic procedures
A Memory Seat Module (MSM), mounted under the
The MSM receives hard-wired inputs from the
8R - 1
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