Circuit Description
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) illuminates the traction control indicator during the IPC bulb check or a serial data message when a fault is detected. The BCM supplies voltage to the traction control switch, when pressed the IPC receives a serial data message from the BCM to illuminate the indicator.