Nitro 2WD V6-4.0L (2007)
Seat Heater: Description and Operation
Heated Seats
Description
DESCRIPTION
WARNING: The front passenger seat assembly contains critical components that affect the front passenger airbag deployment. Correctly
functioning front passenger seat components are critical for the Occupant Classification System (OCS) to properly classify the front passenger
and calculate the proper airbag deployment. Unapproved modifications or service procedures to the front passenger seat assembly, its related
components, or trim cover may inadvertently change the airbag deployment in case of a frontal crash. This could result in death or serious
injury to the front seat passenger if the vehicle is involved in an accident. The following requirements must be strictly adhered to:
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Do not modify the front passenger seat assembly or components in any way.
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Do not modify the front seat center console or center position seat in any way.
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Do not use prior or future model year seat trim covers not designated for the specific model being repaired. Always use the correct seat
trim cover specified for the vehicle.
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Do not replace the seat trim cover with an aftermarket trim cover.
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Do not add a secondary trim cover other than those approved by DaimlerChrysler/Mopar.
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At no time should any Supplemental Restraint System (SRS) component or SRS related component or fastener be modified or replaced
with any part except those which are approved by DaimlerChrysler/Mopar.
Vehicles with the heated seat option can be visually identified by the two heated seat switches (2) located in the center stack (1) of the instrument panel.
The switches are located on the outer edges of the accessory switch bank. The heated seat system allows the driver and front seat passenger to select
from two different levels of electrical seat heating (HI/LO). The heated seat system includes the following major components:
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Heated Seat Elements - Four heated seat elements are used per vehicle. Two heated seat elements are integral to each seat, one in the seat back
and the other in the seat cushion.
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Heated Seat Module - One heated seat module is used per vehicle. The Heated Seat Module is mounted under the left front seat. This module
contains the control logic and software for the front heated seat system. The module communicates on the Local Interface Network (LIN) data bus.
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Heated Seat Switches - Two heated seat switches are used per vehicle, one for each heated seat. Both switches are mounted in the instrument
panel center stack.
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Instrument Cluster (CCN) - The instrument cluster, sometimes referred to as the Cab Compartment Node (CCN) utilizes integrated software and
information carried on the LIN data bus. The CCN serves as the link between the heated seat switches and the heated seat module.
Operation
OPERATION
The heated seat system operates on battery current received through a fuse in the Totally Integrated Power Module (TIPM). Fused ignition switch output
(Run) circuits are used, so that the heated seat system will only operate when the ignition switch is in the ON position. The heated seat system will turn
Off automatically whenever the ignition switch is turned to any position except ON.
A Heated Seat Module is used to control the heated seat system. The module responds to heated seat switch messages and ignition switch status inputs by
controlling the 12v output to the front seat heating elements through integral solid-state relays.
When either of the heated seat switches are depressed a switch status message is sent to the Cab Compartment Node (CCN) or instrument cluster via the
Local Interface Network (LIN) data bus. The CCN then sends a message via the LIN data bus to the heated seat module, signaling the module to
