GM Service Manual Online
For 1990-2009 cars only

The left and the right power seat systems each consist of the following components:

    • The seat switch
    • The front vertical motor
    • The rear vertical motor
    • The horizontal motor
    • The recline motor
    • The belt tower motor

The seat motors operate independently of each other.

The seat switch is located on the seat. The seat switch directly controls the 5 motors located on the seat. The PWR SEAT circuit breaker in the rear fuse block provides power for both seats. Each motor contains an electronic circuit breaker (PTC). The circuit breaker trips at the end of travel. The circuit breaker resets only after the voltage is removed from the motor.

When you push the entire seat switch to the FORWARD position, battery positive voltage (B+) is applied through the forward switch contacts to the horizontal motor. The motor is grounded through the backward switch contacts to ground. The motor runs in order to drive the seat forward until one of the following events occur:

    • The switch releases
    • The seat reaches the end of travel

The BACKWARD position is similar to the FORWARD position. The difference between the BACKWARD position and the FORWARD position is that the voltage polarity is reversed. The reversed polarity causes the motor to run in the opposite direction. The motor then drives the seat backward.

The following motors work similar to the seat horizontal motor:

    • The front vertical motor
    • The rear vertical motor
    • The recline motor
    • The belt tower motor

The motors operate independently according to the following switches:

    • The front vertical switch
    • The rear vertical switch
    • The recline switch
    • The belt tower switch

When you push the entire seat switch to the UP position, battery voltage is applied through the up switch contacts to the following motors:

    • The front vertical motor
    • The rear vertical motor

The motors ground through the down switches that are not operative. Both motors operate in order to drive the entire seat up. A similar action occurs in order to move the entire seat down.