Commander 4WD V8-4.7L VIN N (2006)
Memory Positioning Module: Description and Operation
Module-Memory Seat
MODULE-MEMORY SEAT
DESCRIPTION
NOTE: The scan tool standardization process must be performed on the Memory Seat Module (MSM) any time a new module is installed or the
existing module is reflashed.
The Memory Seat Module (MSM) is located underneath the driver seat, towards the front and on the outboard side. It is used in conjunction with the
other modules in the memory system to recall the driver seat to one of two preset seat positions (horizontal, vertical, and recliner). The switch for the
memory seat programming and selection mounts on the driver door trim panel. The memory system is able to store and recall all driver side power seat
positions, outside mirror positions and power adjustable pedal position. The system can be set for two different drivers. On vehicles with a factory
installed radio connected to the Controller Area Network (CAN) data bus network, the memory system is also able to store and recall up to twelve radio
station presets (six AM and six FM), also for two drivers. The memory system will also store and recall the last station listened to for each driver, even if
it is not one of the twelve 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 the "RKE Linked to Memory" feature is 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 Electronic Vehicle Information Center (EVIC).
OPERATION
The Memory Seat Module (MSM) receives battery current through a 25 amp circuit breaker in the Power Distribution Center (PDC) so that the memory
system remains operational, regardless of the ignition switch position. When the driver memory switch button is pushed, a resistance signal is sent to the
MSM via the Controller Area Network (CAN) bus circuit. The MSM is responsible for the 12v battery feed and ground path to the power seat adjuster
motor and other memory system components.
The MSM receives memory set/position switch input through the CAN bus circuit. The MSM also receives hard wired input from the hall effect sensors,
mounted on each of the driver power seat adjuster motors and the driver side view mirror motor. The programmed software in the module allows it to
know where the seat and adjustable pedals are located in its designed travel by a pulse count generated from the hall effect sensors. This way, when the
memory switch is depressed the module will power these components until the correct preset location is achieved. The module will prevent the seat
memory recall function from being initiated, if the transmission gear selector lever is not in the Park position, or if the vehicle is moving. These inputs
are monitored over the Controller Area Network (CAN) bus circuit by the MSM.
A memory setting is saved by pressing the "set" button, then pressing either the memory "1" or "2" button within 5 seconds of pressing the "set" button.
A memory setting is recalled by pressing either the memory "1" or "2" button, or by pressing the unlock button on a "linked" Remote Keyless Entry
(RKE) transmitter.
For driver safety, memorized settings can not be recalled if the transmission is in a position other than Park or the seat belt is latched.
The MSM performs the following functions:
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Positions the driver power seat (vertical, horizontal, and recliner positions).
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Positions the power adjustable pedals.
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Sends the memory save or recall (number 1 or number 2) command over the CAN data bus circuit to the other memory system components, radio
station pre-sets and power mirror positions.
