Operation - Memory System: Notes

WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.

When a memory switch button is actuated, a hardwired resistance signal is sent to the driver door module. The driver door module then sends the request to the Memory Heated Seat Adjustable Pedal Module (MHSAPM) for the driver seat and pedals. The driver door module would also send the request to the radio for the preset stations. The passenger door module would send the request to the MHSAPM for the passenger outside mirror via the PCI data bus circuit. The driver door module would send the request to the MHSAPM for the driver outside mirror. The MHSAPM is responsible for controlling the 12v battery feed and ground path to the selected adjuster motor to move the seat track or pedal assembly through its drive unit until the preset location is reached.

The Memory Heated Seat Adjustable Pedal Module is the main control module for the power, memory seat and heated seat systems. The module will drive a maximum of 2 motors at a time in a given direction. The software in the module allows it to know where the seat and foot pedal assembly are located in its designed travel by a resistance reading generated from the seat track motor or pedal mounted potentiometers.

The module will prevent the seat memory recall function from being initiated, if the transmission gear selector lever is not in the Park or Neutral positions, or if the vehicle is moving. These inputs are monitored over the PCI data bus circuit by the MHSAPM.