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CS
HEATED SEAT MODULE - FRONT SEATS (Continued)
paper for reference and resolve using the appropriate
Body Diagnostic Procedures Manual.
(2) Check the vehicles battery open-circuit voltage
and charging system performance. If the vehicles
electrical system is defective or weak it may not be
suppling sufficient voltage to operate the system in
question.
REMOVAL
(1) Position the drivers seat as far upward and
rearward as possible.
(2) Open hood, disconnect and isolate the negative
battery cable.
(3) Remove the memory heated seat adjustable
pedal module attaching screws.
(4) Disconnect the module electrical connectors.
(5) Remove the module from under drivers seat.
INSTALLATION
(1) Position the memory heated seat adjustable
pedal module under the drivers seat.
(2) Connect the module electrical connectors.
(3) Install the module attaching screws.
(4) Connect the negative battery cable.
(5) Position the drivers seat in its original position.
(6) Verify correct system operation.
HEATED SEAT MODULE - 2ND
ROW SEATS
DESCRIPTION
Fig. 3 Heated Seat Module - 2nd Row Seat
1 - MOUNTING TABS (NOT USED ON CS)
2 - HEATED SEAT MODULE
3 - ELECTRICAL CONNECTOR RECEPTACLE
The 2nd row seat heated seat module (Fig. 3) is
located in the rear seat center console, where it is
secured by two retaining fasteners. The heated seat
module has a single electrical connector receptacle
HEATED SEAT SYSTEM 8G - 15
that connects all of the inputs and outputs through
the seat and body wire harnesses.
The heated seat module is an electronic micropro-
cessor controlled device designed and programmed to
use inputs from the battery, the two heated seat
switches and the two heated seat sensors to operate
and control the 2nd row seat heated seat system. The
module is also designed to provide outputs to the
heated seat elements in both 2nd row seats and the
two heated seat indicator lamp Light-Emitting
Diodes (LEDs) in each 2nd row heated seat switch.
The heated seat module is able to perform some self-
diagnosis of certain heated seat system faults and
provide feedback of that diagnosis through the
heated seat switch indicator lamps.
The heated seat module cannot be repaired. If the
heated seat module is damaged or faulty, the entire
module must be replaced.
OPERATION
When a 2nd row heated seat switch is depressed a
resistance (ohms) signal is sent to the heated seat mod-
ule, the module energizes the proper indicator LED
(Low or High) in the switch by grounding the indicator
lamp circuit to indicate that the heated seat system is
operating. At the same time, the heated seat module
energizes the selected heated seat sensor circuit and the
sensor provides the module with an input indicating the
surface temperature of the seat cushion.
The Low heat set point is about 35° C (95° F), and
the High heat set point is about 40° C (104° F). If the
heated seat sensor temperature input is below the
temperature set point for the selected temperature
setting, the heated seat module energizes an N-chan-
nel Field Effect Transistor (N-FET) within the mod-
ule which energizes the heated seat elements in the
selected seat cushion and back. When the sensor
input to the module indicates the correct tempera-
ture set point has been achieved, the module de-en-
ergizes the N-FET which de-energizes the heated
seat elements. The heated seat module will continue
to cycle the N-FET as needed to maintain the
selected temperature set point. The 2nd row heated
seat module operates on fused battery current
received from the integrated power module.
If the heated seat module detects a heated seat
sensor value input that is out of range or a shorted
or open heated seat element circuit, it will notify the
vehicle operator or the repair technician of this con-
dition by flashing the High and/or Low indicator
lamps in the affected heated seat switch. Refer to
Diagnosis and Testing Heated Seat System in
the Heated Seat System section for flashing LED
diagnosis and testing procedures. Refer to Diagnosis
and Testing Heated Seat Module in the Electronic
Control Module section for heated seat module diag-
nosis and testing procedures.
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