Description - Memory Seat System

An electronic memory seat system is available on some LH models. The memory system is able to store and recall all driver side power seat positions, and the drivers side view mirror positions. The system can be set for two different drivers. On vehicles with a factory installed radio connected to the Programmable Communications Interface (PCI) data bus network, the memory system is also able to store and recall up to twenty radio station presets (ten AM and ten FM), also for two drivers. The memory system also will store and recall the last station listened to for each driver, even if it is not one of the twenty preset stations.

The memory system will automatically recall all of these settings when a button of the memory switch is depressed, or when the doors are unlocked using the Remote Keyless Entry (RKE) transmitter (if enabled). If the vehicle has more than two drivers the RKE transmitter recall of memory features can be disabled. This is a customer programmable feature of the overhead console. Refer to OVERHEAD CONSOLE for additional information.

The memory system also has a easy exit feature that will move the driver seat rearward 55 millimeters or to the end of its travel, whichever occurs first, when the key is removed from the ignition switch lock cylinder. This is a customer programmable feature of the overhead console. Refer to OVERHEAD CONSOLE for additional information.

A Memory Heated Seat Mirror Module (MHSMM) is used to control and integrate the many electronic functions and features included in the memory seat/mirror and heated seat systems.

The memory system includes the following components:

• Memory Heated Seat Mirror Module (MHSMM)  - This module contains the solid state electronic control and diagnostic logic circuitry for the heated seat and memory seat/mirror systems. One module is used per vehicle and is mounted under the drivers front seat cushion. Refer to the ELECTRONIC CONTROL MODULES for additional information.
• Memory Set/Selector Switch  - One switch is used per vehicle and is mounted in the drivers seat cushion side shield. Refer to the MEMORY SET SWITCH  for additional information.
• Position Potentiometers - Drivers Mirror  - The potentiometer is permanently installed on the drivers side view mirror motor. This potentiometer is used to provide a reference signal to the memory heated seat mirror module, letting the module know the exact position of the mirror.
• Position Potentiometers - Seat Track  - These potentiometers are permanently installed in each of the power seat track motors. They are used to provide a reference signal to the memory heated seat mirror module, letting the module know the exact position of the seat cushion and recliner. Refer to POWER SEAT TRACK  for additional information.
• RKE Transmitter  - The RKE transmitter is attached to the key ring supplied with the vehicle. This device is used to recall preset memory positions as well as other features. Refer to POWER LOCKS for additional information.
• Radio Receiver  - The radio is also part of the memory system and if the radio is PCI data bus capable, multiple radio station presets can be programmed into the memory system also. Refer to AUDIO SYSTEM for additional information.

Certain functions and features 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 helps to reduce wire harness complexity, internal controller hardware, and component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities. For diagnosis of these electronic modules or of the PCI data bus network, the use of a DRB(R) scan tool and the proper Diagnostic Procedures are recommended.

Other vehicle equipped electronic modules that may affect memory system operation are as follows:

• Body Control Module (BCM)  - Refer to BODY CONTROL MODULE for more information.
• Electronic Vehicle Information Center (EVIC)  - Refer to OVERHEAD CONSOLE for more information.
• Powertrain Control Module (PCM)  - Refer to POWERTRAIN CONTROL MODULE for more information.

Refer to HEATED SEAT SYSTEM for more information on the heated seat system.

Refer to SYSTEM WIRING DIAGRAMS for complete circuit diagrams. Following are general descriptions and operations of the major components in the power/memory seat systems.