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 powertrain control module (PCM) sends a signal through circuit 151 (LB/BK) to the speed control switch which passes through the clockspring. The return signal is sent through circuit 848 (DG/OG).