Circuit/System Description

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

The driver and front passenger vented seats switches are located on the center stack near the HVAC controls. When a vented seat switch is pressed, a serial data message is sent from the HVAC controls to the body control module (BCM) indicating the vented seat command. The BCM serves as the heated and vented seat system master to determine the requested operating mode. The BCM then sends a serial data message to the seat heating control module indicating the vented seat command. In response to this message, the seat heating control module applies a low side pulse width modulation (PWM) signal through the seat blower motor control circuit to the seat cushion and seat back blower motors indicating the vented seat command. The logic in the blower motors set the blower speed to the switch set point.