Memory Seat System Components
The memory seat system consists of the following components:
• | Power seat switch assembly |
• | Memory recall switch assembly |
• | Horizontal adjuster motor |
• | Front vertical adjuster motor |
• | Rear vertical adjuster motor |
• | SEAT 30A circuit breaker |
Memory Seat System Description
Battery voltage is supplied to the driver seat module through the power seat
circuit breaker. The driver seat module supplies the seat adjuster switch assembly
with a battery positive reference voltage. While the seat adjuster switches are in
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 driver seat module the switch status is active. Each seat adjuster motor is
controlled by the driver seat module through 2 motor control circuits. While the
seat adjuster motors are in an inactive state the motor control circuits are closed
to ground circuit contacts within the driver seat module. The driver seat module
operates the seat adjuster motors by switching one of a motor's control circuits
to battery voltage. The seat adjuster motors 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 motors are equipped with internal position sensors. The adjuster
motor position sensors are monitored by the driver 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 battery positive reference and
ground circuits from the driver seat module. The position sensor signal circuits
are supplied battery positive voltage through a resistor them monitored within the
driver seat module. During adjuster motor operation the hall effect position sensor
provides a single pulse for every revolution of the adjuster motor shaft. The driver
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 ground
circuits from the driver seat module. The recline position sensor signal circuit
is referenced from ground within the driver seat module. The signal voltage monitored
by the driver 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 driver
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
driver door module. Battery voltage is supplied to the memory recall switch assembly
from the driver door module. When a RCL 1, RCL 2, or EXIT switch is
pressed, the switch contacts close the appropriate switch signal circuit to the battery
voltage supply circuit within the memory recall switch assembly. When the driver
door module receives active switch signals from the memory recall switch assembly,
the appropriate commands are sent to the driver seat module using the Class 2 Serial
Data circuit.
Memory seat recall operation is allowed only with the transmission selector
lever in the PARK position while the ignition is on. The transmission selector lever
position data is provided to the driver seat module by a message through the Class
2 Serial Data circuit.