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141-6
MEMORY SEATS: HEATED SEATS
FRONT
PASSENGER
DOOR
MODULE
(FPDM)
Connector
HEATED
SEAT
SWITCH-
FRONT
PASSENGER
Connector
Heat
mode
select
Back
only
select
High
heat
indicator
MED
heat
indicator
Low
heat
indicator
Back
only
indicator
MEMORY
SEAT
MODULE-
PASSENGER
Connector
HEATED SEAT
THERMISTOR
-PASSENGER
HEATED SEAT
ELEMENT -PAS-
SENGER BACK
HEATED SEAT
ELEMENT -
PASSENGER
CUSHION
RED/BLK
0.35
LT GRN
0.35
YEL/BLK
0.35
YEL
0.35
TAN
0.35
Class 2
serial data
TAN
0.35
BRN
0.35
C600
Connector
H
Data
Lines
C314
Connector
A
A9
C2
B2
C4
BRN/WHT
0.35
Class 2
serial data
Low
reference
B1
C3
YEL
0.35
C315
Con-
nector
A1
C3
YEL/BLK
0.35
D
C
F
E
B12
C4
D
LT GRN
0.35
B7
C3
C
RED/WHT
0.35
RED/WHT
0.35
LT GRN
0.35
A12
C4
B8
C3
B
A
B
A
Heated
seat
element
control
Heated
seat
element
control
B+
B+
Heated
seat
thermistor
signal
See Power
Door Lock
and Power
Windows
Battery
positive
voltage
Circuit Schematic
141-7
120Ć3
Memory Seat System Components
The memory seat system consists of the following
components:
S
Power Seat Switch
S
Seat Horizontal Motor
S
Seat Front Vertical Motor
S
Seat Rear Vertical Motor
S
Seat Recliner Motor
S
Driver Seat Module
S
Memory Seat Switch
Memory Seat System Description
Battery voltage is supplied to the driver seat module
through the power seat circuit breaker. The driver seat
module supplies the seat adjuster switch assembly with
a battery positive reference voltage. While the seat
adjuster switches are in an inactive state the switch
contacts are closed to the adjuster switch ground
circuit. When a seat adjuster switch is pressed to an
active state the switch contact is closed to the reference
voltage circuit. Battery voltage on a switch signal circuit
indicates to the driver seat module the switch status is
active. Each seat adjuster motor is controlled by the
driver seat module through 2 motor control circuits.
While the seat adjuster motors are in an inactive state
the motor control circuits are closed to ground circuit
contacts within the driver seat module. The driver seat
module operates the seat adjuster motors by switching
one of a motor’s control circuits to battery voltage. The
seat adjuster motors are bidirectional and the direction
of adjuster motor rotation is determined by which of the
adjuster motor control circuits is switched to battery
voltage while the other remains grounded.
Memory Set/Recall Operation
The seat adjuster motors are equipped with internal
position sensors. The adjuster motor position sensors
are monitored by the driver seat module and are used to
determine the seat position when storing or recalling
memory settings. The driver seat adjuster motors are
equipped with potentiometer type position sensors.
The front vertical, rear vertical, horizontal, and recline
position sensors are supplied with common 5-volt
reference and ground circuits from the driver seat
module. The position sensor signal circuits are
supplied 5 volts through resistors then monitored within
the driver seat module. The signal voltages monitored
by the driver seat module range from 0.39 -4.58 volts
and are determined by the wiper locations on the
resistors within the position sensors. The position
sensor signal circuit voltage levels are used by the
driver seat module to determine the seat position when
storing or recalling memory seat position settings.
The memory recall switch assembly on the driver’s
door provides inputs to the driver door module. Battery
voltage is supplied to the memory recall switch
assembly from the driver door module. When a
memory recall 1, 2, or EXIT switch is pressed, the
switch contacts close the appropriate switch signal
circuit to the battery voltage supply circuit within the
memory recall switch assembly. When the driver door
module receives active switch signals from the memory
recall switch assembly, the appropriate commands are
sent to the driver seat module using the Class 2 Serial
Data circuit.
Memory seat recall operation is allowed only with the
transmission selector lever in the PARK position while
the ignition is on. The transmission selector lever
position data is provided to the driver seat module by a
message through the Class 2 Serial Data circuit.
Circuit Operation
MEMORY SEATS
141-8
MEMORY SEATS
(Refer to Section 201 for photographs.)
Component
Photo No.
Driver Door Module (DDM)
On lower part of the driver door switch panel
95
. . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Passenger Door Module
(FPDM)
On lower part of passenger door switch panel
96
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block-Rear
Under the left rear seat
52
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lumbar Adjuster Switch-
Driver
On the lower seat, on the side toward the LF door
117
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
Lumbar Adjuster Switch-
Passenger
On the lower seat on the side toward the RF Door
117
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
Memory Seat Module-
Driver
Mounted on underside of seat
121
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Seat Module-
Passenger
Mounted on underside of seat
121
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Seat Switch-Driver
Part of driver’s door module (DDM)
95
. . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Position Sensor-Front
Under the driver’s seat
. . . . . . . .
Position Sensor-Horizontal
Under the driver’s seat
. . .
Position Sensor-Rear
Under the driver’s seat
. . . . . . . .
Position Sensor-Recline
Under the driver’s seat
. . . . . .
Seat Adjuster Switch-Driver
On the lower seat on the side toward the LF Door
117
. . .
. . . . . . . . . . . . . . . . . . . . . . . . .
Seat Adjuster Switch-Front
Passenger
On the lower seat on the side toward the RF Door
117
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
Seat Front Vertical Motor-
Driver
Under driver’s seat
118
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Front Vertical Motor-
Passenger
Under passenger’s seat
118
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Horizontal Motor-
Driver
Under driver’s seat
118
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Horizontal Motor-
Passenger
Under passenger’s seat
118
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Lumbar Horizontal Motor-
Driver
In the driver’s seat back
. . . . . . . . . . . . . . . . . . .
Seat Lumbar Horizontal Motor-
Passenger
In the passenger’s seat back
. . . . . . . . . . . . . . .
Seat Lumbar Position Sensor-
Driver
(Forward/Rearward)
In the driver’s seat back
. . . . . . .
Seat Lumbar Position Sensor-
Driver (Up/Down)
In the driver’s seat back
. . . . . . . . .
Seat Lumbar Position Sensor-
Passenger
(Forward/Rearward)
In the passenger’s seat back
. . . . . . .
Seat Lumbar Position Sensor-
Passenger (Up/Down)
In the passenger’s seat back
. . . . .
Seat Lumbar Vertical Motor-
Driver
In the driver’s seat back
. . . . . . . . . . . . . . . . . . .
Seat Lumbar Vertical Motor-
Passenger
In the passenger’s seat back
. . . . . . . . . . . . . . .
Seat Rear Vertical Motor-
Driver
Under driver’s seat
118
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Location Index
141-9
MEMORY SEATS
(Refer to Section 201 for photographs.)
Component
Photo No.
Seat Rear Vertical Motor-
Passenger
Under passenger’s seat
118
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Recline Motor-Driver
Under driver’s seat
118
. . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Recline Motor-
Passenger
Under passenger’s seat
118
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connector
C311 (10-BLK)
Lower front of driver’s seat
117
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C312 (16-BLK)
Under driver’s seat
119
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C313 (6-BLK)
Under driver’s seat
118
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C314 (10-BLK)
Lower front of passenger’s seat
117
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C315 (16-BLK)
Under passenger’s seat
119
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C316 (6-BLK)
Under passenger’s seat
118
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C500 (12-BLK)
Midpoint of leading edge of left front door
93
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C600 (12-BLK)
Midpoint of leading edge of right front door
93
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground
G302
On the lower left B-pillar
105
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G303
On the lower right B-pillar
105
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Location Index
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