Memory System

The memory system is capable of storing two different position settings for the outside rearview mirrors, driver seat and foot pedals and up to twenty (ten AM and ten FM) radio station presets. The driver door module (DDM) is the memory system master, it lets the other modules in the vehicle know if the vehicle is equipped with the memory system. It also makes the requests to the other modules to set or recall their specific settings. The driver door module stores and recalls the driver outside mirror position. The PDM stores and recalls the passenger outside mirror position. The radio stores and recalls the preset stations and the memory heated seat adjustable pedal module (MHSAPM) stores and recalls the adjustable pedals and driver seat positions.

The memory system will automatically recall all of the previously set "positions" when the corresponding numbered one (1) and two (2) buttons of the memory switch are depressed, or when the doors are unlocked using the Remote Keyless Entry (RKE) transmitter. If the remote link to memory feature is enabled through the EVIC, and the key fob has been linked (pressing SET then one (1) or two (2) on the door followed by depressing the lock switch on the key fob) depressing the unlock switch on the RKE fob will move the seats, pedals, mirrors and radio stations to the linked position. The Body Control Module enables the customer programmable features that are displayed on the EVIC display, in the cluster.

The memory system also has a customer programmable easy exit feature that will move the driver seat rearward 55 millimeters (two inches) or to the end of its travel, whichever occurs first, when the key is removed from the ignition switch lock cylinder.

Certain functions of the memory system rely upon resources shared with other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus network. The PCI data bus network allows the sharing of sensor information. This system provides increased reliability, enhanced diagnostics, and allows the addition of new feature capabilities. For diagnosis of the electronic modules or of the PCI data bus network, the use of a DRB III(R) scan tool and the proper Diagnostic Procedures are recommended.

Electronic modules that may affect memory system operation are as follows:
- Memory Seat Adjustable Pedal Module (MSAPM) or Memory Heated Seat Adjustable Pedal Module (MHSAPM) - Refer to Memory (Heated) Seat Adjustable Pedal Module in the Electronic Control Module for more information.
- Body Control Module (BCM) - Refer to Body Control Module in the Electronic Control Module for more information.
- Driver Door Module (DDM) - Refer to Driver Door Module in the Electronic Control Module for more information.
- Passenger Door Module (PDM) - Refer to Passenger Door Module in the Electronic Control Module for more information.
- Electronic Vehicle Information Center (EVIC) - Refer to Electronic Vehicle Information Center in the Overhead Console System for more information.
- Powertrain Control Module (PCM) - Refer to Powertrain Control Module in the Electronic Control Module for more information.
- Radio Receiver - Refer to Radio Receiver in the Audio System for more information.

Refer to Remote Keyless Entry System in the Power Locks for more information on the RKE system.

When a memory switch button is actuated, a hard-wired 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 3 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.