Power Seats - Operation

OPERATION

POWER SEAT SYSTEM

When a power seat switch is actuated, a battery feed and a ground path are applied through the power seat switch contacts to the appropriate motor or motors. The motor and drive unit operate to move the seat adjuster, seat back or lumbar support (when equipped) in the selected direction until the switch is released, or until the travel limit of the drive unit is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor is reversed through the switch contacts. This causes the motor to run in the opposite direction. Power seats remain operational, regardless of the ignition switch position.

NOTE:
When equipped with memory seat system, anytime a driver power seat motor or seat track is replaced, the Memory Seat Module (MSM) must be cleared of all learned parameters using a scan tool and the Power Seat System Verification test must be performed.

The motors, gearboxes and linkage for the power seat adjuster, power reclining seat back and power lumbar support cannot be adjusted or serviced separately. If a motor, gearbox or linkage for the power seat adjuster, power recliner or power lumbar becomes inoperative or damaged, the entire power seat adjuster and pan assembly, or the seat back frame assembly must be replaced Seat Back Cover - Removal.

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.

NOTE:
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.