Module, Memory: Operation

Memory Seat Module 

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Power and Communication 

• The Memory Seat Module (MSM) receives battery current through a fuse in the Power Distribution Center (PDC).
• The MSM receives hard-wired input from the hall effect sensors. The hall effect sensors are internal to the motors and are not serviceable.
• The MSM receives bus input from the Body Control Module (BCM).

Drivers power seat with MSM equipped 

• The MSM is used to control driver power seat horizontal and vertical movement.
• The MSM is used to control driver lumbar seat horizontal and vertical movement.
• The drivers seat switch has 6 selectable positions. Forward, rearward, Front Up, Front Down, Rear Up, and Rear Down.
• The MSM is responsible for the 12 volt Direct Current (DC) feed and ground path to the power seat adjuster motors and to the other memory system components.
• When the power seat switch is pressed, the MSM received a hardwired resistor value to identify which seat motor(s) are going to be in use.
• The MSM then provides battery level voltage and ground to the appropriate switch output terminals to drive the seat.

Power Tilt and Telescoping Steering Column Adjustment with MSM equipped 

• The MSM is used to control driver power steering column tilt and telescoping movement.
• The Steering Column Control Module (SCCM) monitors the tilt switch input.
• When an input is received from the tilt switch at the SCCM, the input is then sent from the SCCM to the Body Control Module (BCM) on the CAN C bus.
• The BCM converts this input from CAN C bus to CAN B bus.
• The BCM send the request over CAN B bus to the MSM for power steering column tilt and telescoping requests.
• The MSM applies battery level voltage and ground to the appropriate steering column motor.

The hard wired inputs for the MSM may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the MSM. The most reliable, efficient, and accurate means to diagnose the MSM requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information