Concorde V6-3.2L VIN J (2000)
Seat Heater: Description and Operation
HEATED SEAT SYSTEM
Heated seats only available with leather and memory. The seat heaters are controlled by the Memory Heated Seat and Mirror Module (MHSMM).
The heaters will only operate when the ignition switch is in the ON position, and the surface temperature at the from seat heating element sensors
is below the designed temperature set points of the system.
The heater switch is a three position (HI, LO, and neutral position OFF) momentary rocker switch. Green LED's illuminate the switch for night
visibility. Amber LED's are located in the switch adjacent to the HI and LO graphics, which indicate the selected operating mode of the seat heater
, The LO heat position set point is about 98°F and the HI set point is about 107°F.
The heaters are solid high side driven, and are controlled by an NTC circuit. When either HI or LO is activated, the temperature in the seat rises
the Negative Temperature Coefficient (NTC) resistance decreases, and the voltage reading detected by the MHSMM increases. The seat heater
output is deactivated once the voltage reading reaches its upper threshold for either of the settings, HI or LO.
As the temperature decreases the voltage reading decreases until the lower threshold is reached for either setting, HI or LO. At this point the seat
heat output is activated once again. This cycle repeats itself as long as the seat heat request remains on. The thresholds for high and low settings
are pre-programmed into the MHSMM.
The system will automatically turn off when the ignition is turned to the OFF position.
Memory And Heated Switch Location
Memory And Heated Switches