Power Seat Memory Switch - Operation

OPERATION

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 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.

The memory seat switch is diagnosed using a scan tool Testing and Inspection.

The memory seat switch cannot be adjusted or repaired and must be replaced if damaged or inoperative.