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 (1) located
in the center stack of the instrument panel. The
heated seat system allows the driver and front seat
passenger to select from two different levels of electri-
cal seat heating (HI/LO). The heated seat system for
this vehicle includes the following major components,
which are described in further detail later in this sec-
tion:
•
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 right front seat. This module
contains the control logic and software for the
front heated seat system. The module communi-
cates on the Controller Area Network (CAN) 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 CAN 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 Integrated Power Module (IPM).
Fused ignition switch output (run) circuits are used, so that the heated seat system will only operate when the igni-
tion 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 resistance signal is sent to the Cab Compartment Node
(CCN) or instrument cluster. The CCN then sends a message via the Controller Area Network (CAN) data bus to the
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HEATED SEATS - SERVICE INFORMATION
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