Memory Seats

Memory seat system consists of the following components:

• Seat adjuster switch.
• Memory seat module.
• Driver's seat adjuster motor assembly.
• Driver's seat recliner motor.
• PWR/HEATED SEAT PSD (30-amp) circuit breaker.

Memory seat system is controlled by seat adjuster switch and Memory Seat Module (MSM). Seat adjuster motors are controlled by MSM through adjuster motor supply circuits. Adjuster motor operation occurs when MSM switches one of the adjuster motor supply circuits to battery voltage and another to ground. Adjuster motors are reversible and direction of adjuster motor rotation is determined by which adjuster motor supply circuit is switched to battery voltage and which is grounded.

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

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