Power Seat System Operation

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

There are 2 options of power seats available with this system. One option is the base power seat and it is limited to positioning the seat vertically and horizontal only. The other option is a full feature seat that can position the seat vertically, horizontally and reclining the back cushion.

Battery voltage is supplied to the power seat switch from the SEAT 25A circuit breaker. While the seat adjuster switches are in an inactive state the switch contacts are closed to the adjuster switch ground circuit. When a seat adjuster 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 seat adjuster 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.