Memory Seat System
When one of the two driver memory seat switches is pressed, a resistance signal is sent to the Memory Seat Module (MSM) over the Controller Area Network (CAN) data bus. The MSM is responsible for the 12 volt Direct Current (DC) feed and ground path to the power seat motors. The motors move the power seat through their drive units until the correct preset location is achieved.
When equipped with memory seat system, anytime a Memory Seat Module (MSM) is replaced, the MSM must be cleared of all learned parameters using a scan tool and the Power Seat System Verification test must be performed.
The MSM receives the memory seat switch set and selection inputs through the CAN bus circuit, along with input signals from the hall effect sensors in the driver side mirror and power adjustable steering column (when equipped), and hardwired input signals from the hall effect sensors mounted in each of the driver power seat motors. The programmed software in the module allow it to know where the driver seat, driver side mirror and power adjustable steering column (when equipped) are located in their designed travel, by the pulse count generated from each hall effect sensor. This way, when a memory switch is pressed, the MSM powers the driver seat, driver side mirror and power adjustable steering column (when equipped), until each correct preset location is achieved. The MSM will prevent seat memory recall function from being initiated if the transmission gear selector lever is not in the Park position or if the driver seat belt is latched. These inputs are monitored by the MSM over the CAN bus.
- A memory setting is saved by pressing the "set" button, then pressing either the memory "1" or "2" button within five 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.