Chrysler PT Cruiser 2001 Service Manual Supplement page 2066

8G - 6 HEATED SYSTEMS
HEATED SEAT ELEMENT (Continued)
(12) With the black 2-way heated seat back ele-
ment wire harness connector still disconnected from
the heated seat cushion element wire harness con-
nector, check the resistance of the heated seat cush-
ion elements between the heated seat driver circuit
and the seat heater B(+) driver circuit cavities in the
heated seat element half of the 4-way heated seat
element wire harness connector. The resistance
should be about 3.67 ohms ± 10%. If OK, refer to
Heated Seat Sensor in the Diagnosis and Testing
section of this group. If not OK, replace the faulty
seat cushion cover trim and element unit.
HEATED SEAT SENSOR
DIAGNOSIS AND TESTING - HEATED SEAT
SENSOR
For complete circuit diagrams, refer to Wiring
Diagrams.
(1) Disconnect and isolate the battery negative
cable. Disconnect the 4-way heated seat cushion ele-
ment wire harness connector from the power seat
wire harness. The power seat wire harness connec-
tors for the seat cushion and seat back heating ele-
ments are secured to a bracket located under the
rear edge of the seat cushion frame.
(2) Check for continuity between the seat sensor
5V supply circuit cavity of the 4-way heated seat
cushion element wire harness connector and the seat
cushion frame. There should be no continuity. If OK,
go to Step 3. If not OK, replace the faulty seat cush-
ion cover trim and element unit.
(3) Using an ohmmeter, check the resistance
between the seat sensor 5V supply circuit and the
seat temperature sensor input circuit cavities of the
4-way heated seat cushion element wire harness con-
nector. The sensor resistance should be between 14
kilohms at 15° C (60° F) and 5 kilohms at 30° C (85°
F). If OK, go to Step 4. If not OK, replace the faulty
seat cushion cover trim and element unit.
(4) Disconnect the C1 connector of the power seat
wire harness from the Heated Seat Module (HSM)
connector receptacle. Check for continuity between
the seat sensor 5V supply circuit cavity of the 4-way
power seat wire harness connector for the heated
seat cushion element and the seat cushion frame.
There should be no continuity. If OK, go to Step 5. If
not OK, repair the shorted seat sensor 5V supply cir-
cuit as required.
(5) Check for continuity between the seat sensor
5V supply circuit cavities of the 4-way power seat
wire harness connector for the heated seat cushion
element and the C1 power seat wire harness connec-
2001 PT CRUISER
tor for the HSM. There should be continuity. If OK,
go to Step 6. If not OK, repair the open seat sensor
5V supply circuit as required.
(6) Check for continuity between the seat temper-
ature sensor input circuit cavity of the 4-way power
seat wire harness connector for the heated seat cush-
ion element and the seat cushion frame. There
should be no continuity. If OK, go to Step 7. If not
OK, repair the shorted seat temperature sensor input
circuit as required.
(7) Check for continuity between the seat temper-
ature sensor input circuit cavities of the 4-way power
seat wire harness connector for the heated seat cush-
ion element and the C1 power seat wire harness con-
nector for the HSM. There should be continuity. If
OK, refer to Diagnosis and Testing of the Heated
Seat Module in the Electronic Control Modules sec-
tion of the service manual. If not OK, repair the open
seat temperature sensor input circuit as required.
PASSENGER SEAT HEATER
SWITCH
DESCRIPTION
The heated seat switches are located on the out-
board cushion side shield of the driver and passenger
seats. The two, momentary rocker type switches pro-
vide a resistor multiplexed signal to the appropriate
Heated Seat Module (HSM) through separate hard
wired circuits. Each switch contains two light emit-
ting diodes (LED), one for each High and Low setting
to let the occupant know that the seat heater system
is on.
The heated seat switches and their LED's cannot
be repaired. If either switch is faulty or damaged the
entire switch must be replaced.
OPERATION
There are three modes that can be selected with
each of the heated seat switches: Off, Low, and High.
When the front of the switch rocker is depressed, the
High mode is selected and the high mode LED indi-
cator illuminates. Depressing the front of the switch
rocker a second time will return the heated seat to
Off. When the rear of the switch rocker is depressed,
the Low mode is selected and the low mode LED
indicator illuminates. Depressing the rear of the
switch rocker a second time will return the heated
seat to Off. In addition, the heated seats will auto-
matically return to the Off mode anytime the vehicle
ignition switch is turned Off.
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