Circuit Description
WARNING: This page is about a different car, the 2008 Chevrolet Malibu. 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. The BCM supplies a signal to the traction control switch, when pressed the IPC receives a serial data message form BCM to illuminate the traction control indicator.