Caliber L4-2.0L VIN B (2007)
Seat Heater Control Module: Description and Operation
Operation
OPERATION
The heated seat module operates on fused battery current received from the ignition switch. The module is grounded to the body at all times through the
electrical connector. Inputs to the module include Local Interface Network (LIN) data bus messages and standard hardwired 12 volt power and ground.
In response to the LIN inputs the heated seat module will control the battery current to the appropriate heated seat elements.
When a heated seat switch LIN data bus signal is received by the heated seat module, the module energizes the selected heated seat element. The Low
heat set point is about 38° C (100.4° F), and the High heat set point is about 42° C (107.6° F).
In addition to operating the heated seat elements, the heated seat module sends LED illumination messages to the CCN via the LIN data bus. The CCN
then sends the LED illumination message to the accessory switch bank so that the appropriate LEDs are illuminated for any given heating level. Pressing
the switch once will select high-level heating. Pressing the switch a second time will select low-level heating. Pressing the switch a third time will shut
the heating elements off.
If the heated seat module detects a heated seat element OPEN or SHORT circuit, it will record and store the appropriate diagnostic trouble code (DTC).
