Chrysler PT Cruiser 2001 Service Manual Supplement page 2053

PT
ELECTRONIC CONTROL MODULES
HEATED SEAT MODULE
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING . . . . . . . . . . . . . . . . . . 2
HEATED SEAT MODULE . . . . . . . . . . . . . . . . . . 2
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TRANSMISSION CONTROL MODULE
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
HEATED SEAT MODULE
DESCRIPTION
Fig. 1 HEATED SEAT MODULE - TYPICAL
1 - SEAT CUSHION FRAME
2 - HEATED SEAT MODULE
3 - WIRE HARNESS CONNECTOR
4 - POWER SEAT TRACK FRONT BRACKET
Two heated seat modules are used on each vehicle
equipped with the heated seat option. One heated
seat module (Fig. 1) is located on each power seat
track, where they are secured with two push-in type
plastic fasteners. The modules are contained within a
small, rectangular, molded plastic housing with a sin-
gle connector receptacle that allows them to be con-
nected to all of the required inputs and outputs
through the power seat wire harness.
2001 PT CRUISER
ELECTRONIC CONTROL MODULES
TABLE OF CONTENTS
page
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . . 6
PINION FACTOR SETTING . . . . . . . . . . . . . . . . 6
QUICK LEARN PROCEDURE . . . . . . . . . . . . . . . 7
TCC BREAK-IN VIEW/RESTART
PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . 7
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
The heated seat modules are electronic micropro-
cessor controlled devices that are designed to monitor
the inputs and control the outputs of the heated seat
system. The heated seat modules are programmed to
provide two levels of heating for each front seat: a Lo
temperature set point of about 36° C (97° F), or a Hi
temperature set point of about 41° C (105° F). The
heated seat modules are also programmed to perform
self-diagnosis of certain heated seat system functions.
Refer to heated seat module diagnosis and testing for
additional information.
The heated seat modules cannot be adjusted or
repaired. If a module is damaged or faulty, the entire
module must be replaced.
OPERATION
The heated seat module operates on battery current
received through a fuse in the Junction Block (JB) on
a fused ignition switch output (run-acc) circuit so that
the heated seat system will only operate when the
ignition switch is in the On or Accessory positions.
The heated seat module is grounded at all times
through a ground feed from a two wire take out and
eyelet terminal connector of the power seat wire har-
ness that is secured by a ground screw to the top of
the seat crossmember under each front seat. Inputs to
the heated seat module include a seat heater switch
MUX circuit for each of the two heated seat switches,
heated seat sensor inputs from the seat cushions of
each front seat, and battery current from the power
seat circuit breaker in the JB received through the
energized heated seat relay on two heated seat relay
output circuits. Outputs from the heated seat module
include a battery voltage reference to the heated seat
sensors on a sensor feed circuit, a battery current feed
to the two heated seat element circuits on separate
heated seat driver circuits, and separate Lo and Hi
driver circuits for each of the heated seat switch
Light-Emitting Diode (LED) indicator lamps.
8E - 1
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