Electrically Heated Systems

The heated seat feature is available only with the memory system. The system's control module, known as the Memory Heated Seat Adjustable Pedal Module (MHSAPM), is located under the driver's seat and controls the front heated seats only. The driver heated seat control switch is located on the driver door trim panel. The switch is hardwired to the Driver Door Module (DDM). When the operator actuates the switch on, the DDM sends a message via the PCI Bus to the MHSAPM requesting heated seat operation. The passenger heated seat control switch is located on the front-passenger door trim panel. The switch is hardwired to the Passenger Door Module (PDM). When the operator actuates the switch on, the PDM sends a message via the PCI Bus to the MHSAPM requesting heated seat operation.

The system offers two levels of heat which are High and Low. When the High temperature setting is selected the MHSAPM will run through three levels of duty cycle voltage output to the seat heater elements. The highest heat level will last for 4 minutes then will be reduced to a lower level of high for 120 minutes after which will then change to the final level, which is the low heat level. At this level there is no timeout period. Selecting Low heat uses the low heat level duty cycle and stays there. The heated seat system will be turned off for the following reasons; the heated seat switch pushed to off, the ignition switch is cycled off or a related diagnostic trouble code is detected.

The heated seat switch contain resistors pulled up to 5 volts which are processed by the DDM as the voltage readings indicating desired heat setting high or low.

REAR WINDOW DEFOG/HEATED MIRROR
The rear defroster button, located on the Automatic Temperature Control (ATC), controls the rear window defogger and the heated side view mirrors. After pressing the rear defroster button, the ATC sends a bus message over the PCI Bus to the Integrated Power Module (IPM), which controls the Electronic Back Light (EBL) relay. It also sends a bus message to the Driver Door Module (DDM) and the Passenger Door Module (PDM), which the control the heated mirror function. The defroster LED will illuminate when the defroster function is on. The defroster will function for 10 minutes unless cycled off sooner by pressing the defroster button again.