Lumbar Support System Operation
The lumbar support and bolster motors are operated by a four position switch in each seat. Battery voltage is supplied to the lumbar/bolster switch from the SEAT 25A circuit breaker. While the lumbar/bolster switches are in an inactive state the switch contacts are closed to the lumbar/bolster switch ground circuit. When a lumbar/bolster switch is pressed to an active state the switch contact is closed to the battery voltage supply circuit. Each lumbar/bolster motor is controlled by the lumbar/bolster switch through 2 motor control circuits. The lumbar/bolster motors are bidirectional and the direction of motor rotation is determined by which of the motor control circuits is switched to battery voltage while the other remains grounded.
Heated Seats System Operation
Both the driver and passenger seats have 2 heating elements. One is in the s at cushion and the other is in the seat back. The heated seats are capable of obtaining temperatures o 98°F in LOW mode and 107°F in HIGH mode. Battery voltage is supplied to the heated seat module from the SEO2 30A fuse and through a PTC device. The PTC is hard-wired in the battery voltage supply circuit in the seat harness assembly and provides extra circuit protection. Ignition voltage is supplied to the heated seat switch from the IGN3 10A fuse.
When the heated seat switch is pressed ignition voltage is supplied to the solid state switching device within the heated seat switch assembly. The first time the heated seat switch is activated the solid state switching device supplies voltage to illuminate the high LED indicator and a signal voltage to the heated seat module indicating the high mode is active. The second time the heated seat switch is actuated the solid state switching device supplies voltage to illuminate the low LED indicator and a voltage signal to the heated seat module indicating the low mode is active.
When the heated seat module receives a high or low mode active signal from the heated seat switch signal circuit, battery voltage is supplied to the seat cushion and back heater elements. The heated seat cushion thermistor provides a signal to the heated seat module used to determine the seat cushion temperature. The heated seat module regulates the supply voltage to the heater elements according to the inputs from the heated seat switch and the seat cushion thermistor.
Memory Seat System Description
Battery voltage is supplied to the memory seat module from the SEAT 25A circuit breaker. The memory seat module supplies the seat adjuster switch assembly with a battery positive reference voltage. While the seat adjuster switches are an inactive state the switch contacts are closed to the adjuster switch ground circuit. When a seat adjuster switch is pressed to an active state the switch contact is closed to the reference voltage circuit.
Battery voltage on a switch signal circuit indicates to the memory seat module the switch status is active. Each seat adjuster motor is controlled by the memory seat module through 2 motor control circuits. While the seat adjuster motors are in a inactive state the motor control circuits are closed to ground circuit contacts within the memory seat module. The memory seat module operates the seat adjuster motors by switching one of a motor's control Circuits to battery voltage. The seat adjuster motor are bidirectional and the direction of adjuster motor rotation is determined by which of the adjuster motor control circuits is switched to battery voltage while the other remains grounded.
Memory Set/Recall Operation
The seat adjuster motor are equipped with internal position sensors. The adjuster motor position sensors are monitored by the memory seat module and are used to determine the seat position when storing or recalling memory settings. The horizontal, front vertical, and rear vertical adjuster motors use hall effect type position sensors. The hall effect position sensors are supplied with 5-volt reference and ground circuits from the memory seat module.
The position sensor signal circuits are supplied 5 volts through a resistor the monitored within the memory seat module. During adjuster motor operation the hall effect position sensor provides a single pulse for every revolution of the adjuster motor shaft. The memory seat module counts the pulses from the position sensor signal circuits to determine the adjuster motor positions when storing or recalling memory seat position settings.
The recline adjuster motor is equipped with a potentiometer type position sensor. The recline motor position sensor is supplied with it's own 5-volt reference and ground circuits from the memory seat module. The recline position sensor signal circuit is supplied 5 volts through a resistor then monitored within the memory seat module. The signal voltage monitored by the memory seat module ranges from 0.39-4.58 volts and is determined by the wiper location on the resistor within the recline motor position sensor. The recline motor position sensor signal circuit voltage level is used by the memory seat module to determine the seat recline position when storing or recalling memory seat position settings.
The memory recall switch assembly on the driver's door provides inputs to the memory seat module. Battery voltage is supplied to the memory recall switch assembly from the MIR/LOCK 3A fuse. When a SET, RCL 1, or RCL 2 switch is pressed, the switch contacts close the appropriate switch signal circuit to the battery voltage supply circuit within the memory recall switch assembly. Battery voltage on a switch signal indicates to the memory seat module the switch status is active.
Memory seat recall operation is allowed only with the transmission selector lever in the PARK position while the ignition is on. The memory seat module determines the ignition is on using the ignition voltage supply circuit from the IGN3 10A fuse. The memory seat module relies on in input from the shift lock control switch supply circuit in order to determine transmission selector lever is in the PARK position.
