Memory Seat Module

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The memory seat module monitors the heated cooled seat switches through GMLAN message inputs and determines the heated cooled seat operating modes and temperature levels. When heated or cooled seat switch active signals are received through GMLAN messages, and vehicle conditions are appropriate to allow heated or cooled seat operation, the memory seat module (MSM) will calculate the switch activations and determine the heated or cooled seat operating modes. The MSM controls the operating mode of the Climate Control Seat Module (CCSM) through 2 pulse width modulation (PWM) signal circuits. The left and right heated/cooled seat mode signal circuits are referenced from battery voltage by the CCSM and pulsed low by the MSM. Each heated cooled seat is capable of operating in 3 modes with 3 temperature levels so the MSM uses 9 PWM frequencies for each signal circuit to command the heated cooled seat modes to the CCSM.