Lumbar Support System Components
The lumbar support system for the driver and passenger seat consists
of the following components:
• | Seat Lumbar Motor Assembly |
A51 Lumbar Support System Operation
Battery voltage is supplied to the lumbar switch through the power seat
circuit breaker. While the switches are in an inactive state the switch contacts
are closed to the switch ground circuit. When a switch is pressed to an active
state the switch contact is closed to the battery voltage supply circuit.
Each motor is controlled by the lumbar switch through 2 motor control circuits.
The 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.
AR9 Lumbar Support System Operation
The seat module supplies the lumbar adjuster switch assembly with a
battery positive reference voltage. While the switches are in an inactive
state the switch contacts are closed to the switch ground circuit. When a
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
seat module the switch status is active. Each seat adjuster motor is controlled
by the 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 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.
The driver seat lumbar 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 lumbar positions when storing or recalling
memory settings. The lumbar adjuster motors use potentiometer type position
sensors. The position sensors are supplied with 5-volt reference and ground
circuits from the driver seat module. The position sensor signal circuits
are supplied 5 volts through a resistor them monitored 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 position sensor. The signal circuit voltage levels
are used by the driver seat module to determine the lumbar motor positions
when storing or recalling memory seat position settings.