Driver Heated Seat Switch Description; Operation; Diagnosis And Testing - Driver Heated Seat Switch - Chrysler PT Cruiser Service & Repair Manual

8G - 4 HEATED SEAT SYSTEM
HEATED SEAT SYSTEM (Continued)
FAILURE MODE
Shorted Heating Element
Open Heating Element
NTC Sensor Value Out of Range
DRIVER HEATED SEAT
SWITCH
DESCRIPTION
Fig. 2 PT HEATED SEAT
1 - HEATED SEAT SWITCH
2 - SEAT CUSHION SIDE SHIELD
The heated seat switches are located on the out-
board cushion side shield of the driver (Fig. 2) and
passenger seats. The two, momentary rocker type
switches provide a resistor multiplexed signal to the
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.
HEATED SEAT SYSTEM SELF-DIAGNOSTIC TABLE
SWITCH HI LED
INDICATOR
Flashing
Flashing
Off

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 turn the heated seat to Off.
When the rear of the switch rocker is depressed, the
Low mode is selected and the low mode LED indica-
tor illuminates. Depressing the rear of the switch
rocker a second time will also turn the heated seat to
Off. In addition, the heated seats will automatically
return to the Off mode anytime the vehicle ignition
switch is turned Off.
Both switches provide separate resistor multi-
plexed hard wire inputs to the Heated Seat Module
to indicate the selected mode. The Heated Seat Mod-
ule responds to the heated seat switch status mes-
sages by controlling the output to the seat heater
elements of the selected seat. The Low heat position
set point is about 36° C (97° F), and the High heat
position set point is about 41° C (105° F).
DIAGNOSIS AND TESTING - DRIVER HEATED
SEAT SWITCH
For circuit description and diagrams, refer to Wir-
ing Diagrams.
Inspect the Heated Seat Switches for apparent
damage or sticking/binding and replace if required.
Refer to Heated Seat Switch Removal and Installa-
tion in this section.
Using an ohmmeter, check the continuity between
pin 4 and pin 6 of the switch. Measure the resistance
between the two pins while depressing the appropri-
ate button. Refer to (Fig. 3) and the Heated Seat
Switch Pin Call-Out table. If the readings do not cor-
respond to those in the Heated Seat Switch Continu-
ity table, replace the heated seat switch.
SWITCH LO LED INDICATOR
Flashing
Off
Flashing
PT