HEATED SEATS - SERVICE INFORMATION
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 deploy-
ment. 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:
•
Do not modify the front passenger seat assembly or components in any way.
•
Do not modify the front seat center console or center position seat in any way.
•
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.
•
Do not replace the seat trim cover with an aftermarket trim cover.
•
Do not add a secondary trim cover other than those approved by DaimlerChrysler/Mopar.
•
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/Mo-
par.
Vehicles with the heated seat option can be visually
identified by the two heated seat switches located in
the center stack (1) of the instrument panel. The
switches are located on the outer edges of the acces-
sory switch bank (2). 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 for this vehicle includes the follow-
ing major components, which are described in further
detail later in this section:
•
Heated Seat Elements - Four heated seat ele-
ments 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.
•
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.
•
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.
•
Instrument Cluster (CCN) - A Cab Compartment Node (CCN) is part of the instrument cluster on this vehicle.
The 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
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 energize the heating element for the
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HEATED SEATS - SERVICE INFORMATION
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