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Chrysler Town, Dodge Caravan. Manual - part 128

knobs for the seat switch unit must be removed
before the seat switch can be removed from the side
shield.

The power seat switch cannot be repaired. If one

switch is damaged or faulty, the entire power seat
switch unit must be replaced.

OPERATION

When a power seat switch control knob or knobs

are actuated, a battery feed and a ground path are
applied through the switch contacts to the power seat
track

recliner

adjuster

motor.

The

selected

adjuster motor operates to move the seat track or
recliner through its drive unit in the selected direc-
tion until the switch is released, or until the travel
limit of the adjuster is reached. When the switch is
moved in the opposite direction, the battery feed and
ground path to the motor are reversed through the
switch contacts. This causes the adjuster motor to
run in the opposite direction.

No power seat switch should be held applied in any

direction after the adjuster has reached its travel
limit. The power seat adjuster motors each contain a
self-resetting circuit breaker to protect them from
overload. However, consecutive or frequent resetting
of the circuit breaker must not be allowed to con-
tinue, or the motor may be damaged. See the owner’s
manual in the vehicle glove box for more information
on the power seat switch functions and the seat
adjusting procedures.

DIAGNOSIS AND TESTING - DRIVER SEAT
SWITCH

(1) Remove the power seat switch, refer to the

Switch Removal and Installation procedures in this
section.

(2) Using an ohmmeter, check pin #1 in the power

seat switch connector receptacle for continuity to
ground. It should be present. If OK, go to Step 3. If
not OK, repair the open ground circuit as required.

(3) Using an voltmeter, check pin #5 of the wire

harness connector for the power seat switch for bat-
tery current. It should be present. If OK, go to Step
4. If not OK, repair the open voltage supply circuit as
required.

(4) Using an ohmmeter, test the power seat switch

continuity as shown in the Test Table at the pins in
the switch connector receptacle (Fig. 3). If there is no
continuity at any of the switch positions, replace the
power seat switch.

DRIVER SEAT SWITCH CONTINUITY TEST

TABLE

SWITCH

POSITION

CONTINUITY BETWEEN

PINS

DRIVER

OFF

PIN 5 & 4
PIN 5 & 3
PIN 5 & 2

PIN 5 & 10

PIN 5 & 9
PIN 5 & 8
PIN 5 & 7
PIN 5 & 6

FRONT RISER
UP

PIN 5 & 6
PIN 1 & 9

FRONT RISER
DOWN

PIN 5 & 9
PIN 1 & 6

CENTER
SWITCH
FORWARD

PIN 5 & 3

PIN 1 & 10

CENTER
SWITCH
REARWARD

PIN 5 & 10

PIN 3 & 1

REAR RISER UP

PIN 5 & 7
PIN 1 & 8

REAR RISER
DOWN

PIN 5 & 8
PIN 1 & 7

RECLINER UP

PIN 5 & 2
PIN 4 & 1

RECLINER
DOWN

PIN 5 & 4
PIN 2 & 1

Fig. 3 Seat Switch Pin Call-Out

8N - 54

POWER SEAT SYSTEM

DRIVER SEAT SWITCH (Continued)

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) On models equipped with the eight-way power

seat, using a push pin remover or another suitable
wide flat-bladed tool, gently pry the power seat and
power recliner switch knobs off of the switch levers
(Fig. 4).

(3) Remove the screws that secure the outboard

seat cushion side shield to the seat cushion frame.
Refer to the Body section of the service manual for
the procedure.

(4) Pull the outboard seat cushion side shield away

from the seat cushion frame far enough to access the
power seat switch wire harness connector.

(5) Disconnect the power seat wire harness connec-

tor from the power seat switch connector receptacle.

(6) Remove the screws that secure the power seat

switch to the inside of the outboard seat cushion side
shield.

(7) Remove the power seat switch from the out-

board seat cushion side shield.

INSTALLATION

(1) Position the power seat switch onto the out-

board seat cushion side shield.

(2) Install and tighten the screws that secure the

power seat switch to the inside of the outboard seat
cushion side shield. Tighten the screws to 1.5 N·m
(14 in. lbs.).

(3) Reconnect the power seat wire harness connec-

tor to the power seat switch connector receptacle.

(4) Position the outboard seat cushion side shield

onto the seat cushion frame

(5) Install and tighten the screws that secure the

outboard seat cushion side shield to the seat cushion
frame. Tighten the screws to 1.5 N·m (14 in. lbs.).

(6) Install the switch knobs on the switch control

levers, if equipped.

(7) Reconnect the battery negative cable.

MEMORY SET SWITCH

DESCRIPTION

Vehicles equipped with the memory system have a

memory switch mounted to the driver side front door
trim panel (Fig. 5). This switch is used to set and
recall all of the memory system settings for up to two
drivers. The memory switch is a resistor multiplexed
unit that is hard wired to the Body Control Module
(BCM). The BCM sends out the memory system set
and recall requests to the other electronic modules
over the Programmable Communications Interface
(PCI) data bus.

The memory switch cannot be adjusted or repaired

and, if faulty or damaged, it must be replaced. For
complete circuit diagrams, refer to Wiring Dia-
grams.

Fig. 4 Removing Switch Control Knobs - Typical

Fig. 5 Memory Switch Location

1 - Memory Switch
2 - Switch Bezel

POWER SEAT SYSTEM

8N - 55

DRIVER SEAT SWITCH (Continued)

OPERATION

The memory switch has three momentary switch

buttons labeled Set, 1 and 2. When the memory set
switch is depressed, a resistance value is sent to the
Body Control Module via hard wired connections.
When the memory system is in “set” mode a chime
will be generated by the body control module.

See the owner’s manual in the vehicle glove box for

more information on the features, use and operation
of the memory switch.

DIAGNOSIS AND TESTING - MEMORY SWITCH

(1) Remove the memory set switch from the driv-

ers door panel (Refer to 8 - ELECTRICAL/POWER
SEATS/MEMORY SET SWITCH - REMOVAL).

(2) Using an ohmmeter, check the continuity of the

memory select switch MUX circuit between the C2
wire harness connector for the body control module
and the wire harness connector for the memory
switch. There should be continuity. If OK, go to Step
3. If not OK, repair the open or shorted MUX circuit
as required.

(3) Using an ohmmeter, check the continuity of the

memory select switch return circuit between the C2
wire harness connector for the body control module
and the wire harness connector for the memory
switch. There should be continuity. If OK, go to Step
4. If not OK, repair the open or shorted return circuit
as required.

(4) Using an ohmmeter, test the resistances of the

memory switch at the pins in the switch connector
receptacle in each switch position. See the Memory
Switch Test Table. If OK, refer to Diagnosis and
Testing Memory System in this section. If not OK,
replace the faulty memory set switch.

MEMORY SWITCH TEST TABLE

MEMORY

SWITCH

POSITION

RESISTANCE

BETWEEN

PINS

RESISTANCE

RANGE

(OHMS)

NEUTRAL

1&2

24650 ± 5%

(24.65 k)

MEMORY 1

1&2

6850 ± 5%

(6.85 k)

MEMORY 2

1&2

2100 ± 5%

(2.10 k)

SET

1&2

4490 ± 5%

(4.49 k)

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the front door trim panel switch bezel

from the driver side front door. Using a thin flat-

bladed pry tool, gently pry the switch bezel away
from the drivers door trim panel.

(3) Disconnect the memory switch wire harness

connector from the memory switch.

(4) Remove the two screws that secure the memory

switch to the back of the driver side front door trim
panel switch bezel.

(5) Remove the memory switch.

INSTALLATION

(1) Position the memory switch and install and

tighten the two screws that secure the memory
switch to the back of the driver side front door trim
panel switch bezel. Tighten the screws to 2.2 N·m (20
in. lbs.).

(2) Reconnect the memory switch wire harness

connector to the memory switch.

(3) Install the trim panel switch bezel onto the

driver side front door.

(4) Reconnect the battery negative cable.

PASSENGER SEAT SWITCH

DESCRIPTION

Vehicles equipped with a passenger side power seat

utilize a four-way power seat switch. This four-way
power

seat

switch

features

two

knobs

ganged

together on the outboard seat cushion side shield.

The switch is secured to the back of the seat cush-

ion side shield with two screws. However, the control
knobs for the seat switch unit must be removed
before the seat switch can be removed from the side
shield.

The power seat switch cannot be repaired. If one

switch is damaged or faulty, the entire power seat
switch unit must be replaced.

OPERATION

When a power seat switch control knob or knobs

are actuated, a battery feed and a ground path are
applied through the switch contacts to the power seat
track

recliner

adjuster

motor.

The

selected

No power seat switch should be held applied in any

8N - 56

POWER SEAT SYSTEM

MEMORY SET SWITCH (Continued)

of the circuit breaker must not be allowed to con-
tinue, or the motor may be damaged. See the owner’s
manual in the vehicle glove box for more information
on the power seat switch functions and the seat
adjusting procedures.

DIAGNOSIS AND TESTING - PASSENGER SEAT
SWITCH

(1) Remove the power seat switch, refer to the

Switch Removal and Installation procedures in this
section.

(2) Using an ohmmeter, check pin #1 of the power

seat switch connector for continuity to ground. It
should be present, If OK go to Step 3 , If NOT OK
repair the open ground circuit as required.

(3) Using a voltmeter, check pin #5 of the power

seat switch connector for battery voltage. If OK, go to
Step 4. If not OK, repair the open voltage supply cir-
cuit as required.

(4) Using an ohmmeter, perform the Seat Switch

Continuity Test table using (Fig. 6). If there is no
continuity at any of the switch positions, replace the
power seat switch.

PASSENGER SEAT SWITCH CONTINUITY

TEST TABLE

SWITCH

POSITION

CONTINUITY BETWEEN

PINS

PASSENGER

OFF

PIN 5 & 4
PIN 5 & 3
PIN 5 & 2

PIN 5 & 10

PIN 5 & 9
PIN 5 & 8
PIN 5 & 7
PIN 5 & 6

FORWARD

PIN 5 & 3

PIN 1 & 10

REARWARD

PIN 5 & 10

PIN 3 & 1

RECLINER UP

PIN 5 & 2
PIN 4 & 1

RECLINER
DOWN

PIN 5 & 4
PIN 2 & 1

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) On models equipped with the eight-way power

seat, using a push pin remover or another suitable
wide flat-bladed tool, gently pry the power seat and
power recliner switch knobs off of the switch levers
(Fig. 7).

(3) Remove the screws that secure the outboard

seat cushion side shield to the seat cushion frame.
Refer to the Body section of the service manual for
the procedure.

(4) Pull the outboard seat cushion side shield away

from the seat cushion frame far enough to access the
power seat switch wire harness connector.

(5) Disconnect the power seat wire harness connec-

tor from the power seat switch connector receptacle.

(6) Remove the screws that secure the power seat

switch to the inside of the outboard seat cushion side
shield.

(7) Remove the power seat switch from the out-

board seat cushion side shield.

INSTALLATION

(1) Position the power seat switch onto the out-

board seat cushion side shield.

(2) Install and tighten the screws that secure the

power seat switch to the inside of the outboard seat
cushion side shield. Tighten the screws to 1.5 N·m
(14 in. lbs.).

Fig. 6 Seat Switch Pin Call-Out

Fig. 7 Removing Switch Control Knobs - Typical

POWER SEAT SYSTEM

8N - 57

PASSENGER SEAT SWITCH (Continued)

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