Chrysler RG Voyager. Manual - part 715

DIAGNOSIS AND TESTING

DRIVER HEATED SEAT SWITCH

Refer to the appropriate wiring information for

complete circuit schematic or connector pin-out infor-
mation.

WARNING: REFER TO THE RESTRAINTS SECTION
OF THIS MANUAL BEFORE ATTEMPTING ANY
STEERING WHEEL, STEERING COLUMN, SEAT OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

CHECKING SWITCH SIGNAL AND WIRING AT THE
MODULE - EARLY BUILD VEHICLES

(1) Disconnect and isolate the battery negative

cable.

(2) Access and disconnect the gray 4-way connector

from the heated seat module. Visually inspect wiring
terminals for damage that would prevent positive
connection. If not OK, repair or replace the necessary
components.

(3) Connect the battery negative cable. Place the

heated seat switch in the LO position. Using an
Ohmmeter, check the resistance between cavities 2
and 3 of the gray connector noted above. Resistance
should be about 3.5 kilohms (3500 ohms). If not OK,
check resistance directly at switch, as noted below. If
OK, proceed to the next step. If not OK, replace the
faulty switch.

(4) Place the heated seat switch in the HI position.

Using an ohmmeter, check the resistance between
cavities 2 and 3 of the gray connector noted above.
Resistance should be about 1.4 kilohms (1400 ohms).
If not OK, check resistance directly at the switch, as
indicated in the Heated Seat Switch Test Table. If
OK, proceed. If not OK replace the faulty switch.

(5) With the system ON in the HI position, check

for battery voltage and ground at cavities 4 and 1. If
OK, proceed with testing remaining components. If
not OK, repair open or shorted wiring.

CHECKING SWITCH SIGNAL AND WIRING AT THE
MODULE - LATE BUILD VEHICLES

(1) Disconnect and isolate the battery negative

cable.

(2) Access and disconnect the black 8-way connec-

tor from the main seat harness. Visually inspect wir-
ing terminals for damage that would prevent positive
connection. If not OK, repair or replace the necessary
components.

(3) Connect the battery negative cable. Place the

heated seat switch in the LO position. Using an
Ohmmeter, check the resistance between cavities 3
and 5 of the black 8-way connector noted above.
Resistance should be about 3.5 kilohms (3500 ohms).
If not OK, check resistance directly at switch, as
noted below. If OK, proceed to the next step. If not
OK, replace the faulty switch.

(4) Place the heated seat switch in the HI position.

Using an ohmmeter, check the resistance between
cavities 3 and 5 of the black 8-way connector noted
above. Resistance should be about 1.4 kilohms (1400
ohms). If not OK, check resistance directly at the
switch, as indicated in the Heated Seat Switch Test
Table. If OK, proceed. If not OK replace the faulty
switch.

(5) With the system ON in the HI position, check

for battery voltage and ground at cavities 4 and 5. If
OK, proceed with testing remaining components. If
not OK, repair open or shorted wiring.

CHECKING SWITCH ONLY

(1) Disconnect and isolate the battery negative

cable. Remove the center bezel from the instrument
panel (Refer to 23 - BODY/INSTRUMENT PANEL/
INSTRUMENT

PANEL

CENTER

BEZEL

REMOVAL).

Check

for

continuity

between

the

ground circuit cavity (#10) of the instrument panel
center bezel switch electrical connector and a good
ground. There should be continuity. If OK, go to Step
2. If not OK, repair the open ground circuit to ground
as required.

(2) Connect the battery negative cable. Turn the

ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run) cir-
cuit cavity of the instrument panel center bezel
switch electrical connector (#4). If OK, turn the igni-
tion switch to the Off position, and go to Step 3. If
not OK, repair the open fused ignition switch output
(run) circuit as required.

(3) Test the heated seat switch as shown in the

Heated Seat Switch Test chart and the connector pin-
out below (Fig. 3). If OK, go to Step 4. If not OK,
replace the instrument panel center bezel switch
assembly.

DRIVER HEATED SEAT SWITCH TEST

SWITCH

POSITION

RESISTANCE

BETWEEN

RESISTANCE

(OHMS)

Off

Pin 4 & 5

OPEN

Low

Pin 4 & 5

3570

High

Pin 4 & 5

1430

All resistance values are ±1%.

HEATED SEAT SYSTEM

8G - 9

HEATED SEAT SWITCH (Continued)

PASSENGER HEATED SEAT SWITCH TEST

SWITCH

POSITION

RESISTANCE

BETWEEN

RESISTANCE

(OHMS)

Off

Pin 3 & 4

OPEN

Low

Pin 3 & 4

3570

High

Pin 3 & 4

1430

All resistance values are ±1%.

(4) Connect the instrument panel center bezel

switch and test the heated seat system for proper
operation. If the system is still inoperative proceed
with checking remaining components.

REMOVAL

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO THE RESTRAINTS SECTION OF
THIS MANUAL BEFORE ATTEMPTING ANY STEER-
ING

WHEEL,

STEERING

COLUMN,

SEAT

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the instrument panel center bezel,

(Refer to 23 - BODY/INSTRUMENT PANEL/IN-
STRUMENT PANEL CENTER BEZEL - REMOVAL).

(3) Remove the three screws (Fig. 4) that secure

the heated seat switch to the back of the instrument
panel center bezel.

(4) Remove the heated seat switch from the back

of the instrument panel center bezel.

INSTALLATION

(1) Position the heated seat switch onto the back

of the instrument panel center bezel.

(2) Install and tighten the three screws (Fig. 5)

that secure the heated seat switch to the back of the
instrument panel center bezel. Tighten the screws to
1.5 N·m (13 in. lbs.).

(3) Install the center bezel onto the instrument

panel, (Refer to 23 - BODY/INSTRUMENT PANEL/
INSTRUMENT PANEL CENTER BEZEL - INSTAL-
LATION).

(4) Connect the battery negative cable.

HEATED SEAT ELEMENTS

DESCRIPTION

The heated seat system includes two seat heating

elements in each front seat, one for the seat cushion
and the other for the seat back. The two elements for
each seat are connected in parallel with the Heated
Seat Module (HSM). The temperature sensor is a
Negative Temperature Coefficient (NTC) thermistor.
One temperature sensor is used for each seat, and it

Fig. 3 Instrument Panel Center Bezel Switch

Connector

Fig. 4 SWITCH RETAINING SCREWS

1 - HEATED SEAT SWITCH ASSEMBLY
2 - RETAINING SCREWS

8G - 10

HEATED SEAT SYSTEM

HEATED SEAT SWITCH (Continued)

is located on the seat cushion heating element for all
models.

The seat heating elements are attached to the seat

cushion foam and seat back foam units. The heated
seat elements and the temperature sensor cannot be
adjusted or repaired and, if inoperative or damaged,
the seat element assembly must be replaced, (Refer
to

ELECTRICAL/HEATED

SEATS/HEATED

SEAT ELEMENT - REMOVAL).

OPERATION

The heated seat elements resist the flow of electri-

cal current. When battery current is passed through
the elements, the resistance of the elements to the
current flow is released in the form of heat. The tem-
perature sensor is a Negative Temperature Coeffi-
cient (NTC) thermistor. When the temperature of the
seat cushion cover rises, the resistance of the sensor
decreases. The heated seat module supplies a five-
volt signal to one side of each sensor, and monitors
the voltage drop through the sensor on a return cir-
cuit. The heated seat module uses this temperature
sensor input to monitor the temperature of the seat,
and regulates the current flow to the seat heating
elements accordingly.

DIAGNOSIS AND TESTING

HEATED SEAT ELEMENTS

The wire harness connectors for the seat cushion

and seat back heating elements are located under the
seat, at the main seat harness. In order to access and
test the heated seat elements it will be necessary to
remove the appropriate front seat retaining bolts and
lay the seat rearward, up against one of the rear
seats. It is not necessary to disconnect the seat elec-
trical connectors, just use care not to damage the
attached wire harnesses while testing.

For complete circuit diagrams, refer to the

appropriate wiring information. The wiring infor-
mation includes wiring diagrams, proper wire and
connector repair procedures, details of wire harness
routing and retention, connector pin-out information
and location views for the various wire harness con-
nectors, splices and grounds.

NOTE: When checking heated seat elements for
continuity, be certain to move the heating element
being checked. Moving the element, such as sitting
in the seat will eliminate the possibility of an inter-
mittent open in the element which would only be
evident if the element was in a certain position.
Failure to check the element in various positions
could result in an incomplete test.

SEAT CUSHION ELEMENT

(1) From under the vehicle, remove the appropri-

ate seats four retaining nuts.

(2) From inside the vehicle, pull the seat up, off

the mounting studs and lay it back, up against one of
the rear seats.

(3) Locate and disconnect the black 4-way electri-

cal connector, connected to the main seat harness.

(4) Check for continuity between the two circuit

cavities labeled “A” and “D” of the wire harness con-
nector (Red & Black wires). There should be continu-
ity. If OK, (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/MEMORY HEATED SEAT/
MIRROR MODULE - DIAGNOSIS AND TESTING)
for complete system testing procedures. If not OK,
install a replacement heated seat cushion element,
(Refer

ELECTRICAL/HEATED

SEATS/

HEATED SEAT ELEMENT - INSTALLATION).

SEAT BACK ELEMENT

(1) From under the vehicle, remove the appropri-

ate seats four retaining nuts.

(2) From inside the vehicle, pull the seat up and

off the mounting studs and lay it back, up against
one of the rear seats.

Fig. 5 SWITCH RETAINING SCREWS

1 - HEATED SEAT SWITCH ASSEMBLY
2 - RETAINING SCREWS

HEATED SEAT SYSTEM

8G - 11

HEATED SEAT ELEMENTS (Continued)

(3) Locate and disconnect the green 2-way electri-

cal connector, connected to the main seat harness.

(4) Check for continuity between the two circuit

cavities of the 2-way wire harness connector. There
should be continuity. If OK, (Refer to 8 - ELECTRI-
CAL/ELECTRONIC

CONTROL

MODULES/MEM-

ORY

HEATED

SEAT/MIRROR

MODULE

DIAGNOSIS AND TESTING) for complete system
testing procedures. If not OK, install a replacement
heated seat back element, (Refer to 8 - ELECTRI-
CAL/HEATED SEATS/HEATED SEAT ELEMENT -
INSTALLATION).

REMOVAL

NOTE: Do not remove the factory installed heating
elements from the seat or seat back cushions. The
original element is permanently attached and can-
not be removed without permanent damage. The
replacement heating element is designed to be
applied directly on top of the factory installed heat-
ing element.

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the appropriate seat cushion or seat

back trim cover.

(3) Disconnect the inoperative heated seat cushion

or seat back element electrical connectors.

(4) Locate the wires leading from the inoperative

heating element and cut them off flush with the edge
of the original heating element.

INSTALLATION

(1) Peel off the adhesive backing on the back of the

replacement heating element and stick directly on
top of the factory installed heating element (Fig. 6)
or (Fig. 7).

CAUTION: During the installation of the replace-
ment heating element, be careful not to fold or
crease the element assembly. Folds or creases will
cause premature failure.

Fig. 6 HEATING ELEMENT INSTALLATION - EARLY

BUILD VEHICLES

1 - ORIGINAL (INOPERATIVE) HEATING ELEMENT
2 - REPLACEMENT HEATING ELEMENT

Fig. 7 HEATING ELEMENT INSTALLATION - LATE

BUILD VEHICLES

1 - ORIGINAL (INOPERATIVE) HEATING ELEMENT
2 - REPLACEMENT HEATING ELEMENT

8G - 12

HEATED SEAT SYSTEM

HEATED SEAT ELEMENTS (Continued)

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