Durango 4WD V8-4.7L VIN P Flex Fuel (2007)
Seat Heater: Description and Operation
Heated Seats - Second Row - Service Information
Description
DESCRIPTION
Vehicles with the heated second row seat option can be visually identified by the two heated seat switches (2) located in the rear center floor console (3).
The heated seat system allows the second row seat passengers to select from two different levels of electrical seat heating (HI/LO). The heated second
row seat system for this vehicle includes the following major components:
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Heated Seat Switch/Module - Two heated seat switch/modules are used per vehicle, including two Light-Emitting Diode (LED) indicator lamps
for heat level indication. One switch/module for the left and one for the right second row seats. The switch/modules contain the solid state
electronic control and diagnostic logic circuitry for the heated second row seat system. The switch/modules are mounted in the front of the rear
center floor console.
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Heated Seat Elements - Four heated seat elements are used per vehicle, one for each second row seat back and seat cushion. The elements are
integral to the second row seat cushion and seat back foam and cannot be removed, once installed at the factory.
Operation
OPERATION
The heated second row 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 second row seat system will only operate when the ignition switch is in the On position. The system will
turn Off automatically whenever the ignition switch is turned to any position except On.
A Heated Seat Switch/Module is used to control the heated second row seat system. The switch/module responds to heated seat switch/module button
input and ignition switch status inputs by controlling the 12v output to the second row seat heating elements through integral solid-state relays.
When either of the heated seat switch/module buttons are depressed the heating element for the selected seat is energized. Amber Light Emitting Diodes
(LEDS) on the side of each switch/module indicate the level of heat in use: Two LEDs are illuminated for high, one for low, and none for off. Pressing
the switch/module button once will select high-level heating. Pressing the button a second time will select low-level heating. Pressing the button a third
time will shut the heating elements off.
The heated seat switch/module energizes an integral solid-state relay, which supplies battery current to the heating elements. When high-temperature
heating is selected, the heaters provide a boosted heat level during the first four minutes of operation after heating is activated. The heat output then
drops to the normal high-temperature level. If high-level heating is selected, the control system will automatically switch to the low level after thirty
minutes of continuous operation. At that time, the number of illuminated LEDs changes from two to one, indicating the change. Operation on the low
setting will continue for another thirty minutes and the system will then be automatically turned off.
The system will automatically turn off the heating elements if it detects an OPEN or LOW short in the heating element circuit.
