Chrysler PT Cruiser 2001 Service Manual Supplement page 2062

8G - 2 HEATED SYSTEMS
HEATED SEAT SYSTEM (Continued)
OPERATION
The heated seat system is designed to provide indi-
vidually controlled, supplemental heat to the seat
cushion and seat back surfaces of both front seats.
Because this system converts electrical current to
heat, the heated seat system can provide a measure
of warm comfort almost immediately upon entering a
cold vehicle, rather than having to wait for the
engine coolant to reach sufficient temperature to
deliver heat through the conventional heater system.
This system allows each front seat occupant to indi-
vidually select one of two comfort levels, Hi or Lo, or
to turn the heater for their seat off.
The heated seat system components operate on
battery current received through a fuse in the Junc-
tion Block (JB) on a fused ignition switch output
(run-acc) circuit so that the system will only operate
when the ignition switch is in the On or Accessory
positions. The heated seat system will be turned Off
automatically whenever the ignition switch is turned
to any position except On or Accessory. Also, the
heated seat system will not operate when the surface
temperature of the seat cushion cover at either
heated seat sensor is above the designed temperature
set points of the system. The heated seat system has
a self-diagnostic capability. When certain failures are
CONDITION
NO HEATED SEAT SWITCH
ILLUMINATION WITH
IGNITION ON
SEATS HEAT, BUT NO
HEATED SEAT SWITCH
INDICATORS
2001 PT CRUISER
HEATED SEAT SYSTEM DIAGNOSIS
POSSIBLE CAUSES
1. Faulty fuse.
2. Wiring faulty.
3. Ground faulty.
4. Faulty switch.
1. Wiring faulty.
2. Faulty switch LED.
3. Faulty module.
detected within the heated seat system, the system
will provide a visual indication of the failure by
flashing the Light Emitting Diode (LED) indicator
lamps located in the heated seat switches. See the
owner's manual in the vehicle glove box for more
information on the features, use and operation of the
heated seat system.
DIAGNOSIS AND TESTING - HEATED SEAT
SYSTEM
Refer toWiring Diagrams for the appropriate wir-
ing information. The wiring information includes wir-
ing diagrams, proper wire and connector repair
procedures, further details on wire harness routing
and retention, as well as pin-out and location views
for the various wire harness connectors, splices and
grounds.
NOTE: DO NOT ATTEMPT TO SWAP HEATED SEAT
MODULES FROM ONE VEHICLE TO ANOTHER.
MOST OF THESE MODULES ARE VEHICLE FEA-
TURE SPECIFIC AND THEREFORE NOT INTER-
CHANGEABLE. ALWAYS USE THE CORRECT PART
NUMBERED MODULE WHEN DIAGNOSING OR
REPLACING A MODULE.
CORRECTION
1. Check heated seat fuse in Junction Block (JB).
Replace fuse, if required.
2. Check fused ignition switch output (run-acc)
circuit from heated seat switch connector to
ignition switch. Repair, if required.
3. Check for ground at heated seat switch
connector. Repair, if required.
4. Refer to Heated Seat Switch for the proper
switch diagnosis and testing procedures.
1. Check LED driver circuit(s) from heated seat
switch connecvtor to heated seat module
connector. Repair, if required.
2. Replace switch with known good unit. If OK,
discard faulty switch.
3. Refer to Heated Seat Module for the proper
module diagnosis and testing procedures.
Replace, if required.
PT