Operation; Diagnosis And Testing - Driver Heated Seat Switch - Chrysler 300M 2002 Service Manual

8G - 10 HEATED SEAT SYSTEM
DRIVER HEATED SEAT SWITCH (Continued)
Fig. 1 Memory and Heated Seat Switch Location
1 - HEATED SEAT SWITCH
2 - POWER SEAT SWITCH
3 - SEAT CUSHION SIDE SHIELD
4 - MEMORY SELECTOR SWITCH
Fig. 2 Memory and Heated Seat Switches
1 - MEMORY SELECTOR SWITCH
2 - DRIVER POSITION SET
3 - HEATED SEAT SWITCH
4 - LED'S
5 - DRIVER POSITION
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 positions that can be selected with
each of the heated seat switches: Off, Low, and High.
When the front of the switch rocker is fully
depressed, the High position is selected and the high
position LED indicator illuminates. When the rear of
the switch rocker is fully depressed, the Low position
is selected and the low position LED indicator illumi-
nates. When the switch rocker is moved to its neutral
position, or middle, Off is selected and both LED
indicators are extinguished.
Both switches provide separate resistor multi-
plexed hard wire inputs to the BCM to indicate the
selected switch position. The BCM monitors the
switch inputs and sends heated seat switch status
messages to the Heated Seat Module (HSM) or the
Memory Heated Seat Module (MHSM) over the Pro-
grammable Communications Interface (PCI) data
bus. The HSM or MHSM responds to the heated seat
switch status messages 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 as required.
Refer to Heated Seat Switch Removal and Installa-
tion.
Inspect the continuity between pin 4 and pin 6 of
the switch. Measure the resistance between the two
pins. Refer to (Fig. 3)and the Heated Seat Switch Pin
Call-Out table. If the readings do not correspond to
those in the Heated Seat Switch Continuity table,
replace the heated seat switch.
Fig. 3 Heated Seat Switch (Rear View)
HEATED SEAT SWITCH PIN CALL-OUT
PIN
1
2
3
4
5
6
FUNCTION
LO LED
OPEN
GROUND
IGNITION FEED
HI LED
REQUEST LINE
LH