Memory Seat System Operation

The seat adjuster motors are controlled by the memory seat module through the adjuster motor supply circuits. Adjuster motor operation occurs when the memory seat module switches one of the adjuster motor supply circuits to battery positive voltage and the other to ground. The adjuster motors are reversible and the direction of the adjuster motor rotation is determined by which of the adjuster motor supply circuits is switched to battery positive voltage and which is grounded.

The seat adjuster switch is supplied with a 12-volt reference circuit by the memory seat module. When a seat adjuster switch is pressed the signal circuit is closed to the 12-volt reference. Closing the switch signal circuit to the reference voltage pulls the signal circuit high indicating to the memory seat module the switch status is active. The memory seat module also uses the serial data circuit for diagnostic purposes and to send and receive messages which affect the memory seat system operation.

The seat adjuster motors are equipped with position sensors. The position sensors are supplied with a 5-volt reference circuit and low reference circuit from the memory seat module. Whenever a memory seat module function is active the memory seat module receives a signal from each position sensor which varies from 0 to 5 volts depending on the seat position. The memory seat module uses the position sensor signal voltages to determine the seat position when storing or recalling seat position settings.