GM Service Manual Online
For 1990-2009 cars only

Power Seat System Components

The power seat system consists of the following components:

    • Driver seat adjuster switch
    • Passenger seat adjuster switch
    • Driver horizontal adjuster motor
    • Driver front vertical adjuster motor
    • Driver rear vertical adjuster motor
    • Passenger horizontal adjuster motor
    • Passenger front vertical adjuster motor
    • Passenger rear vertical adjuster motor
    • DEFOG/SEATS 30A circuit breaker

Driver and Passenger Power Seat Operation

The power seat switch is supplied battery positive voltage from the DEFOG/SEATS 30A circuit breaker through circuit 1240. The switch is grounded through circuit 1450. Each adjuster motor is controlled by two switches connected through the adjuster motor supply circuits. The seat adjuster switches are closed to ground when inactive. When a seat adjuster switch is pressed from an inactive position to an active position the switch contact is moved from ground to battery positive voltage while the inactive switch provides the ground. The direction of the adjuster motor rotation is determined by which supply circuit is battery positive and which is ground.