1996 CHRYSLER VOYAGER Service Manual

POWER SEATS
CONTENTS
page page
MEMORY SEAT AND MIRROR SYSTEM....... 3POWER SEATS........................... 1
POWER SEATS
INDEX
page page
GENERAL INFORMATION
INTRODUCTION......................... 1
DIAGNOSIS AND TESTING
DIAGNOSTIC PROCEDURES................ 1POWER SEAT SWITCH.................... 1
SEATMOTORS .......................... 1
GENERAL INFORMATION
INTRODUCTION
Power seats can be adjusted in eight directions; up,
down, forward, back, tilt forward, or tilt rearward.
Four reversible motors and a transmission located on
the seat tracks provide the various seat movements.
The electrical circuit is protected by a 40 amp fuse in
the Power Distribution Center (PDC) and a 30 amp
circuit breaker located in the wire harness under the
driver's seat.
DIAGNOSIS AND TESTING
DIAGNOSTIC PROCEDURES
Before testing the seat functions, verify that the
battery is fully charged and the terminals cleaned
and tightened to ensure proper connections. If the
battery is not fully charged, refer to Group 8A Bat-
tery for proper testing procedures.
The following test will determine if the circuit is
complete through the body harness to the switch:
Using a voltmeter, verify the condition of the power
seat circuit breaker located under the driver's seat.
The circuit breaker also protects the passenger side
power seat track circuit. Check both sides of the cir-
cuit breaker connector for voltage, on the wire side.
²If not OK replace circuit breaker.
²If battery voltage is detected on both sides of the
circuit breaker. Refer to Seat Motor in the Diagnostic
and Testing in this section.²If seat motors test OK, refer to the Seat Switch
in the Diagnostic and Testing in this section.
²Refer to Group 8W Wiring Diagrams for wire
circuit information.
SEAT MOTORS
(1) Remove power seat switch from seat. Refer to
Group 23 Body for procedures.
(2) Disconnect wire connector.
(3) Using a voltmeter check for battery voltage at
Pin 5. Using an ohmmeter, check Pin 1 for ground.
(4) To test the seat motors, refer to (Fig. 1) and
verify proper seat responses. Using two jumper
wires, connect one to a battery supply and the other
to a ground. Connect the other ends to the seat wire
harness connector as described in (Fig. 1). If any
motor fails to operate, check wire connectors to the
motor. If not OK, repair as necessary. If OK, replace
seat motor/track assembly.
POWER SEAT SWITCH
(1) Remove power seat switch from seat. Refer to
Group 23 Body for procedures.
(2) Using an ohmmeter, perform the switch conti-
nuity tests in (Fig. 2). If there is no continuity at any
of the switch positions, replace switch.
NSPOWER SEATS 8R - 1

Fig. 1 Seat Motor Test
Fig. 2 Power Seat Switch Test
8R - 2 POWER SEATSNS
DIAGNOSIS AND TESTING (Continued)

MEMORY SEAT AND MIRROR SYSTEM
INDEX
page page
GENERAL INFORMATION
INTRODUCTION......................... 3
DESCRIPTION AND OPERATION
MEMORY SELECTOR SWITCHES............ 3
POSITION SENSING SEAT AND RECLINER
POTENTIOMETERS..................... 4
POWER SIDE VIEW MIRROR POSITION
SENSING............................. 3
SEAT AND RECLINER SWITCHES............ 4
DIAGNOSIS AND TESTING
CIRCUIT DESCRIPTION.................... 7DIAGNOSTIC MODE...................... 5
MEMORY SELECTOR SWITCHES............ 4
SEAT AND RECLINER POSITION SENSING.... 9
SIDE VIEW MIRROR SWITCH STUCK......... 4
SERVICE PROCEDURES
REMOTE KEYLESS ENTRY (RKE) DATA LINK . . . 9
REMOVAL AND INSTALLATION
MEMORY SWITCHES..................... 10
SEAT TRACK ASSEMBLY.................. 10
GENERAL INFORMATION
INTRODUCTION
Memory Seat and Mirrors system is available only
on Town and Country (Luxury Class) vehicles.
Refer to Group 8W, Wiring Diagrams for circuit
information and component locations. Refer to the
proper Body Diagnostic Procedures manual for addi-
tional diagnostic information.
The Memory Seat/Mirror Module (MSM Module) is
mounted under the driver's seat, on the inboard
upper track with Torx head screws. The MSM Mod-
ule provides the driver with an adjustable seat,
recliner, and power side view mirror positioning con-
troller that remembers stored positions and will
recall those positions on command.
The Memory Seat/Mirror Module reads all seat and
recliner switch inputs and operates the seat and
recliner motors in response to switch actuation. The
MSM Module monitors position sensing potentiome-
ters (mounted on the motors) for seat and recliner
positioning.
The MSM Module operates the power side view
mirror motors through solid state drivers (electronic
switches) in the recall mode only, and follows the
glass face position by means of rheostats built into
the motor pack assembly of the mirrors. Normal elec-
trical operation of the mirrors is accomplished by
actuation of the power mirror switch.
The Memory Seat/Mirror Module monitors the mem-
ory switches and has the capability to store desired
positions in non-volatile memory in response to a valid
input sequence. Refer to Memory Selector Switches (1,
2, and S) and Remote Keyless Entry (RKE) Data Link.
The memory seat/mirror module also can activate the
previously described motors in response to a recall
request from an individual memory switch.
The Memory Seat/Mirror Module monitors a data
link between the RKE receiver and the Body Control
Module (BCM) and will respond to stored information
or modify stored information when requested by a
valid data stream.
The Memory Seat/Mirror Module is connected to
the system through a seat wiring harness that inter-
faces will all of the components within the seat struc-
ture, and with electrical distribution wiring harness
connections to the non-seat mounted components.
The module operates the seat and recliner motors
through relays: four dedicated to track forward/rear-
ward, track front up/down, track rear up/down, and
recliner forward/rearward. A fifth relay controls the
direction of operation of those motors.
DESCRIPTION AND OPERATION
POWER SIDE VIEW MIRROR POSITION SENSING
The mirror switch on the instrument panel oper-
ates the outside rear view mirrors independently of
the memory seat/mirror module. The module acti-
vates the mirror motors only when in its recall mode.
The side view mirrors have position sensing rheo-
stats built into each side view mirror vertical and
horizontal motor assembly. These rheostats provide a
sense voltage to the memory seat/mirror module that
indicates where the mirror is moving to or where its
position is at when the module is activated but the
mirror motor is not moving.
MEMORY SELECTOR SWITCHES
The memory selector switches are mounted on the
driver's door trim panel within easy reach of the
driver. They provide a means to set or recall either of
NSPOWER SEATS 8R - 3

two positions of seat and recliner, and the side view
mirrors as chosen by the driver.
The inputs from these switches to the memory
seat/mirror module is a ground level signal.
(1) Adjust the seat, recliner and side view mirrors
to the desired position.
(2)
Press momentarily and release memory switch S.
(3) Press momentarily and release memory switch
1 or 2. Do NOT press any switches for 10 seconds.
(4) To program the second driver's position, follow
the above sequence.
(5) To recall either of the programmed positions
momentarily press and release either memory selec-
tor switch 1 or 2.
DEFINITION OF: MOMENTARILY AND
RELEASE
The memory seat/mirror module has switch input
timing requirements of a minimum press momen-
tarily time of 250 milliseconds followed by a maxi-
mum hold time of 5 seconds, followed by a maximum
release time between steps of 5 seconds that must be
met for proper operation of the system.
SEAT AND RECLINER SWITCHES
The seat and recliner switch assembly is mounted
outboard on the seat side-shield. Press and hold the
desired seat or recliner switch to effect movement.
The Memory Seat/Mirror Module (MSM Module) will
drive a maximum of 2 motors at a time in a given
direction. If conflicting directions are requested, the
priority for response will be as follows:
²Seat Track Rearward
²Seat Front Down
²Seat Rear Down
²Recliner Rearward
²Seat Track Forward
²Seat Front Up
²Seat Rear Up
²Recliner Forward
The inputs from these switches to the MSM Mod-
ule is a current limited battery source fed by the
MSM Module. This protects the MSM Module printed
circuit board traces from acting as fuses. All of these
switch contact inputs to the module are normally
closed to ground, except when actuated.
POSITION SENSING SEAT AND RECLINER
POTENTIOMETERS
A potentiometer is mounted to each seat track and
recliner motor end-bell to provide a sense voltage to
the Memory Seat/Mirror Module that will indicate to
the module where the seat track or recliner is posi-
tioned.
This sense voltage is derived from a 5 volt source
provided by the module to the potentiometer. Thesense voltage is input into the module and stored by
the Memory Seat/Mirror Module.
DIAGNOSIS AND TESTING
MEMORY SELECTOR SWITCHES
To test the memory selector switch:
(1) Remove the memory selector switch. Refer to
removal procedure.
(2) Using an ohmmeter check continuity reading
between switch pins. Refer to (Fig. 1) for proper Pin
numbers.
SIDE VIEW MIRROR SWITCH STUCK
The mirror switches in the instrument panel have
normally open contacts when in their inactive state.
The left/right rocker switch has a center-off detent. If
this switch is actuated to either side, it then becomes
connected to the P73/P70, circuits which are the mir-
ror motor common connections. No faults will result
from this action by itself. If one of the other switch
contacts from the round portion of the switch
becomes accidentally closed,It can cause problems
such as both mirrors operating at the same
time in the vertical or horizontal modes.
²Turn ignition switch ON: If two mirror switch
contacts, from the round portion, are stuck in the
closed position, and the left/right portion is actuated
to either side, a mirror motor will become actuated.
This will drive the motor to its stop, where it will
keep ratcheting until a switch contact is released or
the ignition is turned to OFF. Replace the mirror
switch assembly to correct this condition.
²With the ignition switch in the ON or the OFF
position: If only one mirror switch contact is stuck in
the closed position, the mirror motor will not become
actuated. During an ignition switch recall of a driv-
Fig. 1 Memory Selector Switch Continuity
8R - 4 POWER SEATSNS
DESCRIPTION AND OPERATION (Continued)