Back Frame Replacement .
FRONT SEAT RECLINER ACTUATOR MOTOR REPLACEMENT
The front seat recliner actuator motor is serviced as part of the seat back assembly. If the actuator
motor needs to be replaced the entire seat back frame kit will need to be installed. Refer to Front
Seat Back Frame Replacement .
DESCRIPTION AND OPERATION
MEMORY SEATS DESCRIPTION AND OPERATION
Battery voltage is supplied to the driver seat module through a 25 A 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 common 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 motors 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 driver seat adjuster motors use potentiometer type
position sensors. The position sensors are supplied with a 5-volt positive reference and ground
circuits from the driver seat module. The position sensor signal circuits return to an analog input
within the driver seat module. During adjuster motor operation the position sensor provides a
voltage change proportional to the change in revolution of the adjuster motor shaft. The driver
seat module monitors the voltage from the position sensor signal circuits to determine the adjuster
motor positions when storing or recalling memory seat position settings.
The memory recall switch assembly on the driver 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
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Power Seats - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado