This vehicle is only available with full function 8 way power seats with driver memory. For the driver memory
seat operation refer to Memory Seats Description and Operation . The passenger power seat is completely
controlled through the power seat switch. Battery voltage is supplied to the power seat switch through the
power seat circuit breaker. While the seat adjuster switches are in an inactive state the switch contacts are
closed to the power seat switch ground circuit. When a power seat switch is pressed to an active state the switch
contact is closed to the battery voltage supply circuit. Each seat adjuster motor is controlled by the power seat
switch through 2 motor control circuits. 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.
LUMBAR SUPPORT DESCRIPTION AND OPERATION
Lumbar Support/Torso Bolster System Components
The lumbar support/torso bolster system for the driver and passenger consists of the following components:
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Driver and passenger lumbar support/torso bolster switches
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Driver and passenger lumbar support/torso bolster motor assemblies
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Driver seat module
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Memory select switch
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Driver door module
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SEAT 30A circuit breaker
Lumbar Support/Torso Bolster System Operation
The driver seat lumbar and torso adjuster motors are controlled through the driver seat module, while the
passenger seat lumbar and torso adjuster motors are controlled directly through the lumbar support/torso bolster
adjuster switch.
The driver seat module supplies the driver seat lumbar support/torso bolster 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 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.
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 lumbar and torso 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
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2