Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
The anti-lock brake system (ABS) module sends a reference voltage to the traction control switch along circuit 959 (GY) to the traction control switch. When the switch is pressed, the reference voltage continues through the switch to ground along circuit 57 (BK). When the ABS module then disables the traction control system when it detects this change in reference voltage.